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Certified Loose Stones

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GIA Certified 1.50 Carat Marquise Diamond Loose Stone
By Roman Malakov
Located in New York, NY
A marquise cut loose diamond certified by GIA as G color, VS2 clarity, with good polish and
Category

21st Century and Contemporary American Loose Gemstones

Materials

Diamond

GIA Certified 1.50 Carat Marquise Diamond Loose Stone
GIA Certified 1.50 Carat Marquise Diamond Loose Stone
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W 0.24 in D 0.14 in L 0.5 in
Exceptional Vivid Tanzanite Loose Stone 11.01 Carats GIA Certified
Located in Media, PA
GIA REPORT NUMBER: 6234199403 This exceptional loose tanzanite stone, weighing 11.01 carats, has
Category

21st Century and Contemporary Tanzanian Loose Gemstones

Materials

Tanzanite

GIA Certified 1.72 Carat Cushion Cut Diamond Loose Stone
By Roman Malakov
Located in New York, NY
A beautiful cushion cut diamond certified by GIA as G color, SI1 clarity with excellent polish and
Category

21st Century and Contemporary American Loose Gemstones

Materials

Diamond

GIA Certified 1.72 Carat Cushion Cut Diamond Loose Stone
GIA Certified 1.72 Carat Cushion Cut Diamond Loose Stone
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W 0.26 in D 0.19 in L 0.28 in
GRS Certified 3.03 Carat Natural Unheated Mozambique Ruby Loose Stone
Located in London, GB
GRS Certified 3.03 Carat Natural Unheated Mozambique Ruby Loose Stone This Item is ideal for your
Category

2010s Mozambican Loose Gemstones

Materials

Ruby

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

Gubelin Certified 2.01 Carat Unheated Natural Mogok Burma Ruby Loose Stone
Located in London, GB
Gubelin Certified 2.01 Carat Unheated Natural Mogok Burma Ruby Loose Stone Come with a Gubelin
Category

2010s Mozambican Loose Gemstones

Materials

Ruby

GIA Certified 0.46 Carat Natural Paraiba Tourmaline Loose Stone Oval Shape
Located in Los Angeles, CA
Paraiba tourmaline loose with a stunning color and clarity. Tourmaline Paraiba authentic is a natural
Category

21st Century and Contemporary Mozambican Loose Gemstones

Materials

Tourmaline, Paraiba

GIA Certified 3.47 Carat Natural Alexandrite Oval Shape, Alexandrite Loose Stone
Located in Los Angeles, CA
most beautiful and rare stone in the world -- Natural Alexandrite 3.47 carats with GIA Report. Each of
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

GRS Certified 3.01 Carat Natural Unheated Ruby Loose Stone in Pigeon Blood
Located in London, GB
GRS Certified 3.01 Carat Natural Unheated Madagascar Ruby Loose Stone in Pigeon Blood This Item
Category

2010s Malagasy Loose Gemstones

Materials

Ruby

GIA Certified No Heat Natural 18.18 Carats Blue Star Sapphire Loose Stone
By OGI Ltd
Located in New York, NY
presence of a distinct star pattern contribute to its overall desirability. Higher-quality stones with
Category

20th Century Sri Lankan Contemporary Loose Gemstones

Materials

Sapphire, Blue Sapphire, Star Sapphire

GIA Certified Oval Ruby Natural Corundum Loose Stone Weighing 2.09 Carat Heated
By OGI Ltd
Located in New York, NY
as its color, clarity, and cut, as well as any treatments that the stone has undergone. If the GIA
Category

Vintage 1950s Burmese Contemporary Loose Gemstones

Materials

Ruby

GIA Certified No Heat Natural Star Ruby Loose Stone Weighing 4.84 Carats
By OGI Ltd
Located in New York, NY
appearance of a star-shaped pattern on the surface of the stone when viewed under a single light source. This
Category

20th Century Sri Lankan Contemporary Loose Gemstones

Materials

Ruby, Star Ruby

GIA Certified 0.70 Carat Fancy Intese Blue Diamond VVS1 Loose Stone, Collector
Located in New York, NY
This is a gorgeous intense blue diamond. The color is borderline vivid so you will get a great deal. on price.
Category

2010s Israeli Contemporary Loose Gemstones

Materials

Diamond, Blue Diamond

Harakh 1.04 Ct AGS Certified Natural Pigeon Blood Ruby Loose Stone Custom Made
By Harakh
Located in New York, NY
jeweler Harakh Mehta. Presenting this gorgeous AGS Certified ‘Pigeon Blood’ 1.04-carat faceted no heat
Category

2010s Modern Loose Gemstones

Materials

Ruby

Harakh AGS Certified 2.02 Ct Natural Pigeon Blood Ruby Loose Stone Custom made
By Harakh
Located in New York, NY
carats, brilliant cut, non-treated, no heat AGS certified ruby. Measuring 8.22 x 6.46 x 4.32 mm, this
Category

2010s Mozambican Modern Loose Gemstones

Materials

Diamond, Ruby

GIA Certified 1.01 Carat Brilliant Cut Loose Diamond
Located in New York, NY
1.01 Round Brilliant Cut Loose Diamond GIA certified D/ SI2 Grade Cut : Good Polish: Very Good
Category

2010s American Loose Gemstones

Materials

Diamond

GIA Certified 1.01 Carat Brilliant Cut Loose Diamond
GIA Certified 1.01 Carat Brilliant Cut Loose Diamond
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W 0.25 in D 0.17 in L 0.25 in
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

Green Natural Loose Peridot Stone 3.37 Carats Peridot Stone Peridot for Jewelry
Located in Bangkok, TH
Green Natural Loose Peridot Stone, available for sale at whole sale price natural high quality
Category

21st Century and Contemporary Pakistani Modern Loose Gemstones

Materials

Peridot

3.70 Carat Colombian Emerald, Unset Loose Gemstone, GIA Certified
By Sarosi By Timeless Gems
Located in Los Angeles, CA
would be stunning set as a classic 3-stone ring flanked by baguette cut or trapezoid diamonds! Custom
Category

21st Century and Contemporary Colombian Artisan Loose Gemstones

Materials

Emerald

GIA Certified 2.14 Carat Natural Brazilian Alexandrite, Loose Alexandrite
Located in Los Angeles, CA
seasons. This Natural Alexandrite has been certified by GIA with a report that includes photos, maps
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

Natural Loose 1.02 Carat Novelty M, SI2 GIA Certified
Located in New York, NY
ITEM DESCRIPTION ID #: NYC57470 Stone Shape: Novelty Diamond Weight: 1.02carat Clarity: SI2 Color
Category

21st Century and Contemporary Loose Gemstones

Materials

White Diamond

Natural Loose 1.02 Carat Novelty M, SI2 GIA Certified
Natural Loose 1.02 Carat Novelty M, SI2 GIA Certified
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H 0.1 in W 0.21 in L 0.47 in
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

GRS Certified 9.16 Carat Blue Sapphire Untreated Loose Gem
Located in Taipei, TW
, mainly from the Mogok Stone Tract in Upper Burma. This mine also produces rubies, which share the same
Category

21st Century and Contemporary Burmese Loose Gemstones

Materials

Blue Sapphire

GRS Certified 9.16 Carat Blue Sapphire Untreated Loose Gem
GRS Certified 9.16 Carat Blue Sapphire Untreated Loose Gem
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W 0.39 in D 0.28 in L 0.54 in
GIA Certified 0.76 Carat Natural Brazilian Alexandrite, Loose Alexandrite
Located in Los Angeles, CA
gemstone. This stone is one-of-a-kind and guaranteed to be real. A gorgeous, blue-green changing to purple
Category

21st Century and Contemporary Brazilian Loose Gemstones

Materials

Alexandrite

Alexandrite Chrysoberyl 1.16 Carat Loose Gemstone, GIA Certified - RTP
By Sarosi By Timeless Gems
Located in Los Angeles, CA
phenomenal colored stones. Please contact us for details.
Category

21st Century and Contemporary Sri Lankan Artisan Loose Gemstones

Materials

Alexandrite, Chrysoberyl

GIA Certified 1.01 Carat Brilliant Cut Loose Diamond D / VS1
Located in New York, NY
1.01 Round Brilliant Cut Loose Diamond GIA certified D/ VS1 Grade Cut : Very Good Polish: EX
Category

2010s American Loose Gemstones

Materials

Diamond

GIA Certified 1.01 Carat Brilliant Cut Loose Diamond D / VS1
GIA Certified 1.01 Carat Brilliant Cut Loose Diamond D / VS1
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W 0.26 in D 0.16 in L 0.26 in
GIA Certified 1.50 Carat Brilliant Cut Loose Diamond G / IF
Located in New York, NY
1.50 Carat Round Brilliant Cut Loose Diamond GIA certified G / IF Grade Cut : Very Good Polish
Category

2010s American Loose Gemstones

Materials

Diamond

GIA Certified 1.50 Carat Brilliant Cut Loose Diamond G / IF
GIA Certified 1.50 Carat Brilliant Cut Loose Diamond G / IF
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W 0.3 in D 0.18 in L 0.3 in
GRS Certified 12.68 Carat Blue Sapphire Untreated Loose Gem
Located in Taipei, TW
Mogok Stone Tract in Myanmar, formerly known as Burma. This region has been producing sapphires and
Category

21st Century and Contemporary Loose Gemstones

Materials

Blue Sapphire

GRS Certified 12.68 Carat Blue Sapphire Untreated Loose Gem
GRS Certified 12.68 Carat Blue Sapphire Untreated Loose Gem
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W 0.47 in D 0.38 in L 0.52 in
Unheated 13.12 Carat Ceylon Blue Sapphire, Loose Gemstone, Certified Cushion
By Emeralds Maravellous
Located in US
Unheated 13.12 Carat Ceylon Blue Sapphire, Loose Gemstone, Certified Certified 13.12 Carats Blue
Category

21st Century and Contemporary Sri Lankan Contemporary Loose Gemstones

Materials

Blue Sapphire

Natural Loose Amethyst Stone 5.90 Carats Amethyst Gemstone Amethyst Ring
Located in Bangkok, TH
Natural Loose Amethyst Stone, available for sale, natural high quality flawless 5.90 carats, Custom
Category

21st Century and Contemporary Brazilian Modern Loose Gemstones

Materials

Amethyst

9.31 Carats Brilliant Loose Aquamarine Stone for Rings Aquamarine Jewellery
Located in Bangkok, TH
Natural Loose Aquamarine Stone, available for sale at wholesale price natural high quality, 9.31
Category

21st Century and Contemporary Pakistani Modern Loose Gemstones

Materials

Aquamarine

GIA Certified 4.04 Carat Cushion Cut Loose Diamond H / VS1
Located in New York, NY
ring design. GIA certified H / VS1 Polish: EX Symm: Very Good Depth: 70.3 Stone Table: 59
Category

2010s American Loose Gemstones

Materials

Diamond

GIA Certified 2.02 Carat Oval Cut Loose Diamond E / VVS1
Located in New York, NY
engagement ring design. GIA certified E / VVS1 Polish: Very Good Symm: Very Good Depth: 61.3 Stone Table
Category

2010s American Loose Gemstones

Materials

Diamond

GIA Certified 2.02 Carat Oval Cut Loose Diamond E / VVS1
GIA Certified 2.02 Carat Oval Cut Loose Diamond E / VVS1
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W 0.4 in D 0.17 in L 0.28 in
3.41 Carats Natural Sweet Pink Tourmaline Stone Tourmaline Loose Gemstone
Located in Bangkok, TH
, 3.41 Carats Loose Certified Pink Tourmaline Gemstone From Madagascar. Product Information: GEMSTONE
Category

21st Century and Contemporary Malagasy Modern Loose Gemstones

Materials

Tourmaline

Untreated Cushion Cut Blue Sapphire 0.63ct IGI Certified Loose Gem
By Gems and Jewels UK
Located in Birmingham, GB
Untreated Cushion Cut Blue Sapphire 0.63ct IGI Certified Loose Gem 5.4x4.3mm Natural Untreated
Category

20th Century Loose Gemstones

Materials

Blue Sapphire

GRA Certified 2.06ct Green Blue Sapphire Loose Cushion Cut Gem
By Gems and Jewels UK
Located in Birmingham, GB
GRA Certified 2.06ct Green Blue Sapphire Loose Cushion Cut Gem 9.3x6.4mm GRA Certified Deep Green
Category

20th Century Loose Gemstones

Materials

Blue Sapphire, Sapphire

GRA Certified 2.06ct Green Blue Sapphire Loose Cushion Cut Gem
GRA Certified 2.06ct Green Blue Sapphire Loose Cushion Cut Gem
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H 0.15 in W 0.37 in D 0.26 in
GIA Certified 3.52 Carat Natural Alexandrite Cushion Shape, Loose Alexandrite
Located in Los Angeles, CA
collection is a gorgeous example of the stone's natural beauty. This gemstone will impress you at first
Category

21st Century and Contemporary Unknown Loose Gemstones

Materials

Alexandrite

GIA Certified 25.04 Carat Natural Chrysoberyl Cat's Eye Loose Gemstone
Located in Stamford, CT
customized ring and pendant necklace settings or purchased as a loose stone. Please feel free to contact us
Category

21st Century and Contemporary Loose Gemstones

Materials

Chrysoberyl

Loose Heat Treated GIA Certified 2.49 Carat Oval Burmese Ruby
Located in Los Angeles, CA
GIA Certified Heat Treated Burmese Ruby Shape- Oval Modified Brilliant Cut Carat Weight- 2.49
Category

21st Century and Contemporary Burmese Modern Loose Gemstones

Materials

Ruby

Loose Heat Treated GIA Certified 2.49 Carat Oval Burmese Ruby
Loose Heat Treated GIA Certified 2.49 Carat Oval Burmese Ruby
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W 0.36 in D 0.17 in L 0.29 in
4.82carat Natural Blue Sapphire loose Stone oval shape Blue Sapphire
Located in Delhi, DL
Certified no heat no treatment Natural oval shape 4.82carat Blue sapphire Carat: 4.82 cts Colour
Category

21st Century and Contemporary Sri Lankan Art Deco Loose Gemstones

Materials

Blue Sapphire

GIA Certified 40.11 Carat Loose Untreated Natural Cushion Yellow Sapphire
Located in Carmel-by-the-Sea, CA
TREATMENT No Indications of Heating Item Description: One loose stone Weight: 40.11 carats Measurements
Category

2010s Loose Gemstones

Materials

Yellow Sapphire

GIA Certified 0.91CT D SI1 Round Brilliant Loose Natural Diamond
Located in New York, NY
ITEM DESCRIPTION ID #: 56575 Stone Shape: Round Brilliant Diamond Weight: 0.91CT Clarity: SI1
Category

21st Century and Contemporary Loose Gemstones

Materials

Diamond, White Diamond, Blue Diamond

Certified 2.95 Carats Natural Loose Rhodolite Garnet Gem For Jewellery
Located in Peshawar, PK
Loose Rhodolite Garnet Weight: 2.95 Carat Dimension: 10 x 8.4 x 4.4 Mm Certificate: Available
Category

21st Century and Contemporary Central African Arts and Crafts Loose Gems...

Materials

Rhodolite

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

Emerald Cut Emerald Loose Gemstone 0.57 Carat Weight ICL Certified
By Tsarina Jewels
Located in Bangkok, TH
pieces featuring primarily unique stones we facet in-house from rough gems we source in Russia. We use
Category

2010s Russian Modern Loose Gemstones

Materials

Emerald

Untreated Russian Emerald Loose Gemstone 0.37 Carat Weight ICL Certified
By Tsarina Jewels
Located in Bangkok, TH
unique stones we facet in-house from rough gems we source in Russia. We use only natural, untreated and
Category

2010s Russian Modern Loose Gemstones

Materials

Emerald

GIA Certified 1.50 Carat Pear Cut Natural Diamond Loose Teardrop
By Antinori Fine Jewels
Located in Rome, IT
This sizeable 1.50 carat GIA certified pear cut diamond offers vibrant sparkle, a completely eye
Category

2010s Italian Modern Loose Gemstones

Materials

Diamond

Unheated 10.78 Carat Ceylon Yellow Sapphire, Loose Gemstone, GIA Certified
By Sarosi By Timeless Gems
Located in Los Angeles, CA
exceptional brilliance due to its superior cut with depth that makes it sparkle from every angle. This stone
Category

21st Century and Contemporary Sri Lankan Artisan Loose Gemstones

Materials

Sapphire, Yellow Sapphire

Natural Purple Loose Sapphire Stone 1.94 Carats Sapphire Gemstone Sapphire Ring
Located in Bangkok, TH
Certified Natural Purple Loose Sapphire Stone 1.94 Carats Sapphire Gemstone Sapphire Ring Sapphire Gemstones
Category

21st Century and Contemporary Sri Lankan Modern Loose Gemstones

Materials

Sapphire

GIA Certified 1.09 Carat Pear Shape Cut Loose Diamond E / IF
Located in New York, NY
engagement ring design. GIA certified E / IF Polish: Very Good Symm: Very Good Depth: 68.7 Stone Table: 56
Category

2010s American Loose Gemstones

Materials

Diamond

GIA Certified 1.09 Carat Pear Shape Cut Loose Diamond E / IF
GIA Certified 1.09 Carat Pear Shape Cut Loose Diamond E / IF
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W 0.35 in D 0.16 in L 0.22 in
Natural Horsetail 0.54 Ct Russian Demantoid Loose Gemstone ICL Certified
By Tsarina Jewels
Located in Bangkok, TH
Garnets - Demantoid. The stones from this region are famous for their vivid green hue, high dispersion
Category

2010s Russian Russian Empire Loose Gemstones

Materials

Garnet

Sweet Pink Natural Loose Tourmaline 2.31 Carats Tourmaline Stone for Jewellery
Located in Bangkok, TH
, 2.31 carats Loose certified tourmaline gemstone from Afghanistan. Product Information: GEMSTONE TYPE
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline

Exceptional Brilliance 0.62 Ct Russian Demantoid Loose Gemstone ICL Certified
By Tsarina Jewels
Located in Bangkok, TH
Garnets - Demantoid. The stones from this region are famous for their vivid green hue, high dispersion
Category

2010s Russian Russian Empire Loose Gemstones

Materials

Garnet

Natural Horsetail 1.03 Ct Russian Demantoid Loose Gemstone ICL Certified
By Tsarina Jewels
Located in Bangkok, TH
Garnets - Demantoid. The stones from this region are famous for their vivid green hue, high dispersion
Category

2010s Russian Russian Empire Loose Gemstones

Materials

Garnet

0.56 Ct Demantoid Garnet from Russia Loose Gemstone ICL Certified
By Tsarina Jewels
Located in Bangkok, TH
Garnets - Demantoid. The stones from this region are famous for their vivid green hue, high dispersion
Category

2010s Russian Russian Empire Loose Gemstones

Materials

Garnet

Natural Horsetail 1.4 Ct Russian Demantoid Loose Gemstone ICL Certified
By Tsarina Jewels
Located in Bangkok, TH
the Russian Imperial family. The Demantoid is rarely found in big crystals, so 1 carat stone is
Category

2010s Russian Russian Empire Loose Gemstones

Materials

Garnet

Greenish Blue Natural Tourmaline Stone 4.87 Carats Loose Tourmaline For Ring
Located in Bangkok, TH
Tourmaline Stone 4.87 Carats Loose Tourmaline For Ring Tourmaline Gemstone Tourmaline Necklace Tourmaline
Category

21st Century and Contemporary South African Modern Loose Gemstones

Materials

Tourmaline

1.09ct AIG Certified Deep Rare Blue Sapphire Oval Cut Loose Gemstone
By Gems and Jewels UK
Located in Birmingham, GB
1.09ct AIG Certified Deep Rare Blue Sapphire Oval Cut 6.6x5mm Loose Gemstone AIG Certified Deep
Category

20th Century Loose Gemstones

Materials

Blue Sapphire

GRA Certified 1.17ct Blue Sapphire Untreated Heart Cut Loose Rare Gem
Located in Birmingham, GB
GRA Certified 1.17ct Blue Sapphire Untreated Heart Cut Loose Rare Gem 7.1x6mm GRA Certified
Category

21st Century and Contemporary British Loose Gemstones

Materials

Blue Sapphire

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Certified Loose Stones For Sale on 1stDibs

Find an expansive variety of certified loose stones available on 1stDibs. These distinct designs — crafted with great care and often made from 18k gold and gold — can elevate any look. The designs in our inventory of certified loose stones bearing artisan or modern hallmarks are very popular. Many examples in our inventory of these items are appealing no matter their origins, but Sarosi By Timeless Gems, Roman Malakov and Harakh produced popular versions that are worth a look. Browse our collection of 14 sapphire versions today to add the perfect touch to your look. A selection of oval cut, cushion cut and brilliant cut can be found today on these pages. When shopping our range of certified loose stones, you’ll find that there are less available pieces for men today than there are for women.

How Much are Certified Loose Stones?

Prices for certified loose stones can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $1,446 and can go as high as $750,000, while certified loose stones, on average, fetch $11,529.

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.