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Gia Certified Loose Gem Stones

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GIA Certified 1.48ct Natural Green Emerald Octagonal Emerald Cut Loose Gem
By Gems and Jewels UK
Located in Birmingham, GB
GIA Certified 1.48ct Natural Green Emerald Octagonal Emerald Cut Loose Gem GIA Certified Natural
Category

21st Century and Contemporary Loose Gemstones

Materials

Emerald

Alexandrite Oval, .86 Carat Loose Gemstone, GIA Certified
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This .86 carat, GIA-certified oval alexandrite is the perfect shape for a 3-stone ring! It exhibits
Category

21st Century and Contemporary Sri Lankan Artisan Loose Gemstones

Materials

Alexandrite, Chrysoberyl

3.70 Carat Colombian Emerald, Unset Loose Gemstone, GIA Certified
By Sarosi By Timeless Gems
Located in Los Angeles, CA
millimeters, this gem is exceptionally well cut and proportioned, giving the emerald superior brilliance and
Category

21st Century and Contemporary Colombian Artisan Loose Gemstones

Materials

Emerald

Alexandrite Chrysoberyl 1.16 Carat Loose Gemstone, GIA Certified - RTP
By Sarosi By Timeless Gems
Located in Los Angeles, CA
fluorescent/daylight that changes to 100% purple in incandescent light. This chrysoberyl gem is the perfect
Category

21st Century and Contemporary Sri Lankan Artisan Loose Gemstones

Materials

Alexandrite, Chrysoberyl

GIA Certified 3.99 Carat Natural Sri Lankan Alexandrite, Alexandrite Loose Gem
Located in Los Angeles, CA
most beautiful of gems, the Sri Lankan Alexandrite is the stone that everyone wants to buy. It deserves
Category

21st Century and Contemporary Sri Lankan Loose Gemstones

Materials

Alexandrite

Unheated 10.78 Carat Ceylon Yellow Sapphire, Loose Gemstone, GIA Certified
By Sarosi By Timeless Gems
Located in Los Angeles, CA
improve their color, so to find a gem of this size and beautiful natural yellow hue is nearly impossible
Category

21st Century and Contemporary Sri Lankan Artisan Loose Gemstones

Materials

Sapphire, Yellow Sapphire

GIA Certified Carved Colombia Emerald Loose Stone Weighing 4.35 Carats
By OGI Ltd
Located in New York, NY
Introducing our exquisite GIA certified carved Colombia Emerald loose stone, a true masterpiece of
Category

20th Century Colombian Contemporary Loose Gemstones

Materials

Emerald

.19 Carat Brazilian Paraiba Tourmaline Oval, Loose Gemstone, GIA Certified ..A
By Sarosi By Timeless Gems
Located in Los Angeles, CA
Paraiba gems from Brazil. This gem is accompanied by Gemological Institute of America Report #6204186929
Category

21st Century and Contemporary Brazilian Artisan Loose Gemstones

Materials

Tourmaline, Paraiba

Unheated 10.21 Carat Pink Purple Spinel, Loose Gemstone, GIA Certified ...A
By Sarosi By Timeless Gems
Located in Los Angeles, CA
large stone like this with a nicely proportioned pavilion is hard to find. Depth adds brilliance and
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Spinel

Unheated 3.11 Carat Purple Pink Sapphire, Unset Loose Gemstone, GIA Certified
By Sarosi By Timeless Gems
Located in Los Angeles, CA
inclusions that do not detract from the brilliance or life of this gem. This pink sapphire is perfect for
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Sapphire, Pink Sapphire

2.19 Carat Cornflower Blue Sapphire Oval, Unset Loose Gemstone, GIA Certified
By Sarosi By Timeless Gems
Located in Los Angeles, CA
gem from Sri Lanka, one of the world's premier sources of fine blue sapphires. This pretty oval
Category

21st Century and Contemporary Sri Lankan Artisan Loose Gemstones

Materials

Sapphire, Blue Sapphire

Unheated 1.39 Carat Burmese Pink Sapphire, Unset Loose Gemstone, GIA Certified
By Sarosi By Timeless Gems
Located in Los Angeles, CA
would make a breathtaking 3-stone ring or pendant. We can help you custom-design the perfect piece of
Category

21st Century and Contemporary Burmese Artisan Loose Gemstones

Materials

Sapphire, Pink Sapphire

GIA Certified 0.46 Carat Natural Paraiba Tourmaline Loose Stone Oval Shape
Located in Los Angeles, CA
. breathtaking and elegant. Natural Mozambique Tourmaline 0.46 carats with GIA Report is one of them. Captivating
Category

21st Century and Contemporary Mozambican Loose Gemstones

Materials

Tourmaline, Paraiba

GIA Certified Fine Blue 1.19ct Untreated Sapphire Pear Cut Unheated Rare Gem
By Gems and Jewels UK
Located in Birmingham, GB
blue colour. Fully certified by GIA confirming stone as natural and untreated. Very rare for natural
Category

21st Century and Contemporary Loose Gemstones

Materials

Sapphire, Blue Sapphire

GIA Certified 1.36ct Untreated Vivid Green Yellow Sapphire Round Diamond Cut Gem
By Gems and Jewels UK
Located in Birmingham, GB
beautiful vivid green yellow colour. Fully certified by GIA confirming stone as natural and untreated
Category

21st Century and Contemporary Loose Gemstones

Materials

Sapphire, Green Sapphire, Yellow Sapphire

Unheated 9.26 Carat Purple Pink Spinel Cushion, Loose Gemstone, GIA Certified .A
By Sarosi By Timeless Gems
Located in Los Angeles, CA
millimeters. It is a vivid and extremely clean stone, displaying superior brilliance and lively, rich color
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Spinel

GIA Certified 0.88 Ct Natural Mozambique Paraiba Tourmaline Stone, Precious Gem
Located in Los Angeles, CA
Have a look at this beautiful natural Mozambique Paraiba tourmaline gemstone with GIA report. This
Category

21st Century and Contemporary Mozambican Loose Gemstones

Materials

Tourmaline, Paraiba

GIA Certified 1.31ct Parti Colour Sapphire Blue Yellow Untreated Emerald Cut Gem
By Gems and Jewels UK
Located in Birmingham, GB
to see. Fully certified by GIA confirming stone as natural, untreated and Australian in origin
Category

21st Century and Contemporary Loose Gemstones

Materials

Yellow Sapphire, Green Sapphire, Sapphire, Blue Sapphire

GIA Certified No Heat Natural Star Ruby Loose Stone Weighing 4.84 Carats
By OGI Ltd
Located in New York, NY
A rare, investment quality GIA star ruby weighing 4.84 carats, no indication of heating GIA REPORT
Category

20th Century Sri Lankan Contemporary Loose Gemstones

Materials

Ruby, Star Ruby

GIA Certified Royal Blue Sapphire Gia Certified and Stated Unheated Kashmir Gem
Located in Jupiter, FL
sapphire is unheated GIA certified and actually stated in the GIA report as "The color appearance of this
Category

21st Century and Contemporary Art Nouveau Loose Gemstones

Materials

Blue Sapphire

GIA Certified 0.76 Carat Natural Brazilian Alexandrite, Loose Alexandrite
Located in Los Angeles, CA
. Gorgeous natural Alexandrite stone. You can get it now! A sparkling gem that's sure to become a family
Category

21st Century and Contemporary Brazilian Loose Gemstones

Materials

Alexandrite

GIA Certified 1.06 Carat Natural Alexandrite, Alexandrite Loose Gemstone
Located in Los Angeles, CA
Treat yourself to a perfect gift for this holiday season. Get a GIA certified Alexandrite gemstone
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

GIA Certified 1.00 Carat Natural Alexandrite, Loose Precious Gemstone
Located in Los Angeles, CA
Treat yourself to a perfect gift for this holiday season. Get a GIA certified Alexandrite gemstone
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

2.11 Carat Pink Sapphire Oval, Unset Loose Gemstone, GIA Certified
Located in Los Angeles, CA
millimeters and weighing 2.11 carats. This oval gem would make a lovely 3-stone or engagement ring and is
Category

21st Century and Contemporary Unknown Artisan Loose Gemstones

Materials

Sapphire, Pink Sapphire

GIA Certified 28.37 Carat Imperial Precious Topaz Emerald Cut Loose Gemstone
Located in Stamford, CT
28.37ct Imperial precious Topaz. This GIA certified natural gemstone is unique in its color, orange
Category

21st Century and Contemporary Loose Gemstones

Materials

Topaz

GIA Certified 0.63 ct Mozambique Loose Paraiba Tourmaline, Blue-Green Tourmaline
Located in Los Angeles, CA
beautiful gems in nature. With its intense, vivid blue-green color and fine clarity it’s no wonder that this
Category

21st Century and Contemporary Mozambican Loose Gemstones

Materials

Tourmaline, Paraiba

GIA Certified 1.08 Carat Emerald Cut Vivid Yellow Zimmi Loose Diamond
By Hasbani Diamonds
Located in London, GB
vividness. GIA certificated. Available as loose stone or can be made into a bespoke piece of high
Category

2010s Sierra Leonean Modern Loose Gemstones

Materials

Diamond

GIA Certified 1.01 Carat Pear Shape Vivid Yellow Zimmi Loose Diamond
By Hasbani Diamonds
Located in London, GB
. Available as loose stone or can be made into a bespoke piece of high jewellery such as a pendant, ring
Category

2010s Sierra Leonean Modern Loose Gemstones

Materials

Diamond

GIA Certified 1.26 Carat Oval Brilliant Vivid Yellow Zimmi Loose Diamond
By Hasbani Diamonds
Located in London, GB
intensity or vividness. GIA certificated. Available as loose stone or can be made into a bespoke piece
Category

2010s Sierra Leonean Modern Loose Gemstones

Materials

Diamond

GIA Certified 0.80 Carat Paraiba Tourmaline, Green-Blue Tourmaline Stone
Located in Los Angeles, CA
beautiful gems in nature. With its intense, vivid green-blue color and fine clarity it’s no wonder that this
Category

21st Century and Contemporary Mozambican Loose Gemstones

Materials

Tourmaline, Paraiba

GIA Certified 0.77 Carat Natural Alexandrite, Color Changing Precious Stone
Located in Los Angeles, CA
We're glad to share with you the certificate of GIA report. With this, you can be sure that the gem
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

GIA Certified Colour Change Sapphire 0.76ct Untreated Round Cut Unheated Rare
By Gems and Jewels UK
Located in Birmingham, GB
or artificial light. Very rare and stunning to see. Fully certified by GIA confirming stone as
Category

21st Century and Contemporary Loose Gemstones

Materials

Sapphire

GIA Certified 1.19ct Parti Colour Thai Sapphire Blue Yellow Untreated Emerald
By Gems and Jewels UK
Located in Birmingham, GB
certified by GIA confirming stone as natural, untreated and Thailand in origin. Also has excellent clarity
Category

21st Century and Contemporary Loose Gemstones

Materials

Sapphire, Blue Sapphire, Yellow Sapphire, Green Sapphire

GIA Certified 1.12ct Parti Colour Australian Sapphire Blue Untreated Cushion Cut
By Gems and Jewels UK
Located in Birmingham, GB
stunning to see. Fully certified by GIA confirming stone as natural, untreated and Australian. Also has
Category

21st Century and Contemporary Loose Gemstones

Materials

Sapphire, Blue Sapphire, Yellow Sapphire, Green Sapphire

Fine Teal Green Blue GIA Certified 1.35ct Unheated Sapphire Oval Cut Untreated
By Gems and Jewels UK
Located in Birmingham, GB
blue teal colour. Fully certified by GIA confirming stone as natural and untreated. Very rare for
Category

21st Century and Contemporary Loose Gemstones

Materials

Sapphire, Blue Sapphire, Green Sapphire

Fine Deep Green Blue GIA Certified 1.03ct Unheated Sapphire Oval Cut Untreated
By Gems and Jewels UK
Located in Birmingham, GB
blue green colour. Fully certified by GIA confirming stone as natural and untreated. Very rare for
Category

21st Century and Contemporary Loose Gemstones

Materials

Sapphire, Blue Sapphire, Green Sapphire

10.17ct GIA Certified Tanzanite
Located in Bloomington, MN
to wear or have near in situations where you need a calming and soothing presence. GIA Certified
Category

21st Century and Contemporary Tanzanian Loose Gemstones

Materials

Tanzanite

10.17ct GIA Certified Tanzanite
10.17ct GIA Certified Tanzanite
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W 0.53 in D 0.35 in L 0.58 in
GIA Certified 1.83 Ct Natural Round Tsavorite for Jewelry Making, Garnet Stone
Located in Los Angeles, CA
Discover the most beautiful and rare of gems, GIA certified natural tsavorite. This green beauty is
Category

2010s Unknown Loose Gemstones

Materials

Tsavorite

1.96ct Cushion Andalusite GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Andalusite The GIA report reads as follows: GIA Report Number
Category

2010s Brazilian Loose Gemstones

Materials

Alexandrite

1.96ct Cushion Andalusite GIA Certified
1.96ct Cushion Andalusite GIA Certified
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W 0.41 in D 0.18 in L 0.23 in
9.70ct Cushion Morganite GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Morganite The GIA report reads as follows: GIA Report Number
Category

2010s Brazilian Loose Gemstones

Materials

Morganite

9.70ct Cushion Morganite GIA Certified
9.70ct Cushion Morganite GIA Certified
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W 0.61 in D 0.34 in L 0.42 in
10.17ct Pear Peridot GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Peridot The GIA report reads as follows: GIA Report Number
Category

2010s Burmese Loose Gemstones

Materials

Peridot

10.17ct Pear Peridot GIA Certified
10.17ct Pear Peridot GIA Certified
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W 0.66 in D 0.34 in L 0.44 in
20.29ct Cushion Aquamarine GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Aquamarine The GIA report reads as follows: GIA Report Number
Category

2010s Brazilian Loose Gemstones

Materials

Aquamarine

20.29ct Cushion Aquamarine GIA Certified
20.29ct Cushion Aquamarine GIA Certified
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W 0.77 in D 0.46 in L 0.62 in
15.84ct Cushion Aquamarine GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Aquamarine The GIA report reads as follows: GIA Report Number
Category

2010s Brazilian Loose Gemstones

Materials

Aquamarine

15.84ct Cushion Aquamarine GIA Certified
15.84ct Cushion Aquamarine GIA Certified
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W 0.8 in D 0.32 in L 0.59 in
15.16ct Cushion Aquamarine GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Aquamarine The GIA report reads as follows: GIA Report Number
Category

2010s Brazilian Loose Gemstones

Materials

Aquamarine

15.16ct Cushion Aquamarine GIA Certified
15.16ct Cushion Aquamarine GIA Certified
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W 0.61 in D 0.42 in L 0.61 in
5.79ct Cushion Morganite GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Morganite The GIA report reads as follows: GIA Report Number
Category

2010s Brazilian Loose Gemstones

Materials

Morganite

5.79ct Cushion Morganite GIA Certified
5.79ct Cushion Morganite GIA Certified
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W 0.45 in D 0.29 in L 0.45 in
16.13ct Cushion Aquamarine GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Aquamarine The GIA report reads as follows: GIA Report Number
Category

2010s Brazilian Loose Gemstones

Materials

Aquamarine

16.13ct Cushion Aquamarine GIA Certified
16.13ct Cushion Aquamarine GIA Certified
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W 0.79 in D 0.36 in L 0.52 in
GIA Certified Marquise Diamond 0.74ct
Located in Antwerpen, BE
tons of ore to yield just one carat of gem-quality diamond, highlighting the exceptional scarcity and
Category

21st Century and Contemporary Modern Loose Gemstones

Materials

Diamond, White Diamond

GIA Certified Marquise Diamond 0.74ct
GIA Certified Marquise Diamond 0.74ct
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W 0.35 in D 0.12 in L 0.2 in
15.54 Carat Oval Opal GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Opal The GIA report reads as follows: GIA Report Number
Category

2010s Ethiopian Loose Gemstones

Materials

Opal

15.54 Carat Oval Opal GIA Certified
15.54 Carat Oval Opal GIA Certified
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W 0.96 in D 0.45 in L 0.52 in
9.70 Carat Cushion Morganite GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Morganite The GIA report reads as follows: GIA Report Number
Category

2010s Brazilian Loose Gemstones

Materials

Morganite

9.70 Carat Cushion Morganite GIA Certified
9.70 Carat Cushion Morganite GIA Certified
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W 0.61 in D 0.34 in L 0.42 in
1.62ct Oval Emerald GIA Certified Colombian
Located in Toronto, Ontario
This is a stunning GIA Certified Emerald The GIA report reads as follows: GIA Report Number
Category

2010s Colombian Loose Gemstones

Materials

Emerald

1.62ct Oval Emerald GIA Certified Colombian
1.62ct Oval Emerald GIA Certified Colombian
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W 0.36 in D 0.17 in L 0.28 in
1.45 ct GIA Certified Colombian Emerald
Located in Toronto, Ontario
This is a stunning GIA Certified Emerald The GIA report reads as follows: GIA Report Number
Category

2010s Colombian Loose Gemstones

Materials

Emerald

1.45 ct GIA Certified Colombian Emerald
1.45 ct GIA Certified Colombian Emerald
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W 0.33 in D 0.21 in L 0.24 in
0.97ct Cushion Red Spinel GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Spinel The GIA report reads as follows: GIA Report Number
Category

2010s Burmese Loose Gemstones

Materials

Spinel

0.97ct Cushion Red Spinel GIA Certified
0.97ct Cushion Red Spinel GIA Certified
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W 0.21 in D 0.18 in L 0.2 in
5.03 ct Cushion Emerald GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Emerald The GIA report reads as follows: GIA Report Number
Category

2010s Zambian Loose Gemstones

Materials

Emerald

5.03 ct Cushion Emerald GIA Certified
5.03 ct Cushion Emerald GIA Certified
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W 0.47 in D 0.27 in L 0.39 in
1.08ct Cushion Demantoid Garnet GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Demantoid Garnet The GIA report reads as follows: GIA Report
Category

2010s Namibian Loose Gemstones

Materials

Garnet

1.08ct Cushion Demantoid Garnet GIA Certified
1.08ct Cushion Demantoid Garnet GIA Certified
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W 0.28 in D 0.16 in L 0.21 in
3.94 ct Cushion Emerald GIA Certified
Located in Toronto, Ontario
This is a stunning GIA Certified Emerald The GIA report reads as follows: GIA Report Number
Category

2010s Zambian Loose Gemstones

Materials

Emerald

3.94 ct Cushion Emerald GIA Certified
3.94 ct Cushion Emerald GIA Certified
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W 0.4 in D 0.24 in L 0.4 in
GIA Certified Natural Alexandrite 0.56 Carats
Located in Los Angeles, CA
We're glad to share with you the certificate of GIA report. With this, you can be sure that the gem
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

GIA Certified Natural Alexandrite 0.56 Carats
GIA Certified Natural Alexandrite 0.56 Carats
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W 0.18 in D 0.11 in L 0.31 in
GIA Certified Natural Alexandrite 2.06 Carats
Located in Los Angeles, CA
, just like this natural alexandrite gemstone. Check out this gorgeous natural gem 2.06 carats with GIA
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

GIA Certified Natural Alexandrite 2.06 Carats
GIA Certified Natural Alexandrite 2.06 Carats
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W 0.26 in D 0.2 in L 0.31 in
8.01ct Freeform Gray Opal GIA Certified Australia
Located in Toronto, Ontario
This is a stunning GIA Certified Opal The GIA report reads as follows: GIA Report Number
Category

2010s Australian Loose Gemstones

Materials

Opal

8.01ct Freeform Gray Opal GIA Certified Australia
8.01ct Freeform Gray Opal GIA Certified Australia
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W 0.64 in D 0.21 in L 0.59 in
6.39ct Freeform Gray Opal GIA Certified Australia
Located in Toronto, Ontario
This is a stunning GIA Certified Opal The GIA report reads as follows: GIA Report Number
Category

2010s Australian Loose Gemstones

Materials

Opal

6.39ct Freeform Gray Opal GIA Certified Australia
6.39ct Freeform Gray Opal GIA Certified Australia
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W 0.71 in D 0.22 in L 0.48 in
1.91ct Oval Green Demantoid GIA Certified Unheated
Located in Toronto, Ontario
This is a stunning GIA Certified Demantoid The GIA report reads as follows: GIA Report Number
Category

2010s Unknown Loose Gemstones

Materials

Alexandrite

1.91ct Oval Green Demantoid GIA Certified Unheated
1.91ct Oval Green Demantoid GIA Certified Unheated
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W 0.36 in D 0.16 in L 0.28 in
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Gia Certified Loose Gem Stones For Sale on 1stDibs

On 1stDibs, there are many options to choose from in our inventory of gia certified loose gem stones. artisan are consistently popular styles when it comes to gia certified loose gem stones. Any of these pieces can lend versatility to your look, but sapphire versions, from our inventory of 9, are particularly popular. Today, if you’re looking for oval cut gia certified loose gem stones and are unable to find the perfect match, our selection also includes cushion cut and brilliant cut alternatives. If you’re browsing the variety of gia certified loose gem stones for sale, you’ll find that many are available today for women, but there are still pieces to choose from for men.

How Much are Gia Certified Loose Gem Stones?

Prices for gia certified loose gem stones can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $3,020 and can go as high as $165,200, while gia certified loose gem stones, on average, fetch $18,942.

Finding the Right loose-gemstones for You

Are you shopping for diamonds and other loose gemstones to create your own custom jewelry? 

Why might you purchase a diamond or gemstone “loose” — that is, on its own, not mounted in a piece of jewelry? Perhaps you’re a connoisseur looking to acquire a unique investment. The scarcity of high-quality colored diamonds, for instance, especially pink diamonds, means that their value increases over time; the same is true of rare Kashmir sapphires and Burmese rubies. Far rarer than diamonds, Paraiba tourmaline, discovered only in the 1980s, is treasured as much for its extraordinary color as its scarcity, both of which contribute to its high value.

A more common scenario would be that you’re hoping to create a very special piece of custom jewelry, such as an engagement ring or a milestone-birthday present, and want to personally select the most beautiful, unusual, or ultra-rare stone you can find and afford. Doing so adds to the romance and substance of the gift and can be a part of the story told as the jewel is passed from generation to generation.

If this sounds like you, read on for tips on becoming one of the world’s savviest gem hunters.

Educate yourself: When buying any piece of gem-set fine jewelry, you should familiarize yourself with the factors that determine a stone’s price. This will enable you to streamline your search for the perfect gem and have intelligent, productive conversations with sellers.

There is a wealth of information online, such as our diamond-buying guide and this overview of colored gemstones for engagement rings. The buying guides of the Gemological Institute of America (GIA), searchable by stone type, are also a widely trusted source for consumers venturing into the world of diamonds and gems for the first time.

Vet your vendor: If you peruse 1stDibs with any regularity, you know there is no shortage of vendors who deal in top-quality loose gemstones. (Read about our vetted sellers.) Finding a trustworthy, established dealer may be as easy as getting a recommendation from friends or family. And, although it may sound obvious, it pays to Google your candidates — and consult customer reviews — before making contact.

Harakh Mehta, designer and founder of the Mumbai, India–based fine-jewelry brand Harakh, has an innate understanding of proper client relations, especially when the customer is in unfamiliar territory. “Start chatting with the dealer, get to know them better," he says. "It’s very important to establish a comfort level. We never push a sale, as we want it to be a carefully considered purchase. So, if the client is not in a rush, we do it over a few virtual meetings or phone calls.”

Request documentation: The best dealers go to great lengths to furnish clients with documents verifying the quality rating, natural origin and provenance of a stone — showing, for example, that loose emerald hails from the famous Muzo mine in Colombia — and disclosing any treatments applied to enhance its appearance. (And who doesn't love emerald jewelry? The most valuable emeralds are the ones that have a deep bluish-green to true green color and no visible inclusions.)

If no grading report is available for a stone you are interested in, the dealer should be able to provide an authenticity document, such as an appraisal or info sheet, that has been signed by an in-house gemologist or professional appraiser. Google those names, too, for extra peace of mind.

Ask for videos and visuals: When transacting with a gem dealer online, you should always request real-time videos and photographs, since professional photos of a stone, usually on a white background, have likely been retouched for optimal presentation.

Read more about how to buy loose gemstones and find your dream gems today on 1stDibs.