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Loose Tourmaline Gems

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Natural Greenish Blue Loose Tourmaline Gem 1.50 Carats Faceted Tourmaline Ring
Located in Bangkok, TH
Natural Greenish Blue Loose Tourmaline Gem, Available For Sale At Wholesale Price Natural High
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline

Natural Light Green Loose Tourmaline Gem 3.0 Carats Faceted Tourmaline Ring
Located in Bangkok, TH
Natural Light Green Loose Tourmaline Gem, Available For Sale At Wholesale Price Natural High
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline

Natural Bluish Green Loose Tourmaline Gem 1.85 Ct Afghan Tourmaline for Jewelry
Located in Bangkok, TH
Natural Bluish Green Loose Tourmaline Gem, Tourmaline For Sale At Wholesale Price Natural High
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline

Beautiful Indicolite Tourmaline Stone 1.90 Carats Loose Tourmaline Gems for Ring
Located in Bangkok, TH
Beautiful Indicolite Tourmaline Stone, Available for sale at wholesale price natural high quality
Category

21st Century and Contemporary Congolese Modern Loose Gemstones

Materials

Tourmaline, Indicolite

Mint Green Tourmaline Gemstones Lot Natural Loose Tourmaline from Afghanistan
Located in Bangkok, TH
Clarity SI to Eye clean Origin Afghanistan Treatment None his lot features natural, loose tourmaline
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline

2.02ct Vivid Olive Green Tourmaline Fancy Octagon Emerald Loose Cut Gem
By Gems and Jewels UK
Located in Birmingham, GB
2.02ct Vivid Olive Green Tourmaline Fancy Octagon Emerald Loose Cut Gem 8.2x6mm Natural Olive
Category

20th Century Loose Gemstones

Materials

Emerald, Tourmaline

13.7ct Oval Mint Green Tourmaline Gemstone
By Hannaboya
Located in Sheridan, WY
captures the essence of serenity and sophistication. This remarkable loose tourmaline gem, with its
Category

2010s African Modern Loose Gemstones

Materials

Tourmaline

Flamingo Pink Tourmaline Stone, 2.30 Carats, Natural Pink Tourmaline, Loose Gem
Located in Bangkok, TH
Flamingo Pink Tourmaline Stone for ring, available for sale at wholesale price natural high quality
Category

21st Century and Contemporary Afghan Loose Gemstones

Materials

Tourmaline

Green Tourmaline Ring Gem 5.49 Carat Oval Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Intense 5.49 carat Green Tourmaline oval gem, offered loose to a gemstone lover. Returns are
Category

21st Century and Contemporary Modern Loose Gemstones

Materials

Tourmaline

Deep Green Tourmaline 2.12ct Octagon Emerald Cut Loose Gem
Located in Birmingham, GB
Deep Green Tourmaline 2.12ct Octagon Emerald Cut Loose Gem 7.6 x 7mm Natural Deep Green Tourmaline
Category

21st Century and Contemporary Loose Gemstones

Materials

Tourmaline

Pink Tourmaline Ring Gem 29.79 Carat Oval Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Exceptional world-class 29.79 carat vivid Pink Tourmaline oval gem offered loose to a top quality
Category

21st Century and Contemporary Mozambican Modern Loose Gemstones

Materials

Tourmaline

Green Tourmaline Ring Gem 11.23 Carat Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Remarkable 11.23 carat Mint Green Tourmaline cushion gem offered loose to a very precious lady or
Category

21st Century and Contemporary Afghan Contemporary Loose Gemstones

Materials

Tourmaline, Other

Paraiba Tourmaline Ring Gem 6 Carat Unmounted Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Exceptional, rare and coveted, 6.47 carat Paraiba Tourmaline oval gem, offered unmounted to the
Category

21st Century and Contemporary Mozambican Contemporary Loose Gemstones

Materials

Tourmaline, Paraiba

Bicolor Tourmaline Ring Gem 29.22 Carat Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
One of a kind 29.22 carat Bicolor Tourmaline gem, offered loose to a wold-class gemstone collector
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline, Other

Bicolor Tourmaline Ring Gem 14.68 Carat Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Magnificent 14.68 carat square cushion-cut Fall Bicolor Tourmaline gem, offered unmounted to a very
Category

21st Century and Contemporary Nigerian Contemporary Loose Gemstones

Materials

Tourmaline, Other

2.50 Carats Natural Loose Baby Pink Tourmaline Ring Gem
Located in Peshawar, PK
Loose Tourmaline Weight: 2.50 Carats Dimension: 8.3x6.2x5.8 Mm Origin: Kunar Afghanistan Shape
Category

21st Century and Contemporary Afghan Arts and Crafts Loose Gemstones

Materials

Tourmaline

2.50 Carats Natural Loose Baby Pink Tourmaline Ring Gem
2.50 Carats Natural Loose Baby Pink Tourmaline Ring Gem
Free Shipping
W 0.25 in D 0.23 in L 0.33 in
4.55 Carats Natural Loose Electric Blue Indicolite Tourmaline Gem
Located in Peshawar, PK
Loose Indicolite Tourmaline Weight: 4.55 Carats Dimension: 12.2x7.8x5.4 Mm Origin: Kunar
Category

21st Century and Contemporary Afghan Art Deco Loose Gemstones

Materials

Indicolite, Tourmaline

Pink Tourmaline Ring Gem 3.18 Carat Unmounted Loose Gemstone
By Tamir
Located in Beverly Hills, CA
Pristine 3.18 carat Pink Tourmaline emerald cut loose gemstone, offered unmounted to a fine
Category

21st Century and Contemporary Congolese Contemporary Loose Gemstones

Materials

Tourmaline

Fine Vivid Pink Purple Tourmaline 3.23ct Oval Cut Loose Gem
Located in Birmingham, GB
Fine Vivid Pink Purple Tourmaline 3.23ct Oval Cut Loose Gem 10 x 8.3mm Fine Pink Purple Tourmaline
Category

21st Century and Contemporary Loose Gemstones

Materials

Tourmaline

Deep Orange Tourmaline Ring Gem 5.23 Carat Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
5.23 carat deep orange Tourmaline cushion gem, offered loose to a gemstone lover. Returns are
Category

21st Century and Contemporary Unknown Contemporary Loose Gemstones

Materials

Tourmaline

Mint Green Tourmaline Ring Gem 5.46 Carat Oval Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Pastel Mint Green Tourmaline oval gem, weighing a total of 5.46 carats, offered loose to a world
Category

21st Century and Contemporary Unknown Modern Loose Gemstones

Materials

Tourmaline

Pink Tourmaline Ring Gem 9.55 Carat Unmounted Oval Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Marvelous 9.55 carat, "loupe clean", Pink Tourmaline oval gem, offered loose to a fine gemstone
Category

21st Century and Contemporary Nigerian Contemporary Loose Gemstones

Materials

Tourmaline

7.47 Carat Light Mint Green Loose Gem Cushion Cut Tourmaline
Located in Stamford, CT
Unique Custom cut, 7.47carat mint green Tourmaline. Excellent brilliance and lots of reflection
Category

21st Century and Contemporary Loose Gemstones

Materials

Tourmaline

Gorgeous Natural Loose Tourmaline Ring Gem 1.80 Carats Afghanistan Mine
Located in Peshawar, PK
. Gem cutters approach the shaping of loose tourmaline with precision to maximize its color intensity
Category

21st Century and Contemporary Afghan Anglo-Indian Loose Gemstones

Materials

Tourmaline

Blue Tourmaline Ring Gem 2.75 Carat Cushion Unmounted Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Splendid 2.75 carat "Lagoon" Blue Tourmaline cushion loose gemstone, offered unmounted to a fine
Category

21st Century and Contemporary Nigerian Contemporary Loose Gemstones

Materials

Tourmaline

Copper Tourmaline Ring Gem 3.15 Carat Round Unset Loose Gemstone
By Tamir
Located in Beverly Hills, CA
Very unique Copper Tourmaline round gem, offered loose to someone special. Returns are accepted and
Category

21st Century and Contemporary Unknown Contemporary Loose Gemstones

Materials

Tourmaline, Other

Tourmaline Ring Gem 13.92 Carat Oval Loose Gemstone Loupe Clean
By Merkaba
Located in Beverly Hills, CA
Impressive 13.92 carat "loupe clean" bluish green pastel oval Tourmaline gem, offered unmounted to
Category

21st Century and Contemporary Mozambican Contemporary Loose Gemstones

Materials

Tourmaline

Bicolor Tourmaline Ring Gem 17.68 Carat Emerald Cut Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Exceptional 17.68 carat, "loupe clean", Bicolor Tourmaline emerald-cut gem, offered loose to a fine
Category

21st Century and Contemporary Mozambican Modern Loose Gemstones

Materials

Tourmaline, Other

Green Tourmaline Earring Gems 6.44 Carat Unmounted Cushion Loose Gemstones
By Merkaba
Located in Beverly Hills, CA
Captivating 6.44 carat Mint Green Tourmaline cushion pair, offered loose and unmounted to a top
Category

21st Century and Contemporary Contemporary Loose Gemstones

Materials

Tourmaline

Mint Green Tourmaline Ring Gem 6.48 Carat Trillion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Bright 6.48 carat Mint Green Tourmaline trillion shaped gem, offered loose to a very unique lady or
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline, Other

Deep Orange Tourmaline Ring Gem 12.60 Carat Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Unique 12.60 carat deep Orange Tourmaline cushion gem, offered loose to a gemstone lover. Returns
Category

21st Century and Contemporary Unknown Contemporary Loose Gemstones

Materials

Tourmaline, Other

Mint Green Tourmaline Earring Gems 5.56 Carats Cushion Loose Gemstones
By Merkaba
Located in Beverly Hills, CA
5.56 Carat Mint Green Tourmaline cushion loose gemstone pair, offered unmounted to an exclusive
Category

21st Century and Contemporary Contemporary Loose Gemstones

Materials

Tourmaline

Green Tourmaline Ring Gem 10.64 Carat Rectangular Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Glamorous 10.64 carat Green Tourmaline rectangular cushion gem, offered loose to a world-class
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline, Other

Pink Green Tourmaline Earring Gems 1.96 Carat Round Loose Gemstones
By Merkaba
Located in Beverly Hills, CA
Perfectly mismatched pair of Pink and Green Tourmaline unmounted round gemstones, weighing a total
Category

21st Century and Contemporary Contemporary Loose Gemstones

Materials

Tourmaline

Pink Green Tourmaline Earring Gems 1.44 Carat Round Loose Gemstones
By Merkaba
Located in Beverly Hills, CA
Perfectly mismatched pair of Pink and Green Tourmaline unmounted round gemstones, weighing a total
Category

21st Century and Contemporary Contemporary Loose Gemstones

Materials

Tourmaline

6.25 Carat Natural Loose Blueish Green Tourmaline Asscher Cut Gem
Located in Peshawar, PK
Loose Bright Green Tourmaline Weight: 6.25 Carats Dimension: 10.1 x 10 x 8.5 Mm Colour: Green
Category

21st Century and Contemporary Afghan Arts and Crafts Loose Gemstones

Materials

Tourmaline

4.60 Carats Sparkling Round Mint Loose Tourmaline Engagement Ring Gem
Located in Peshawar, PK
Loose Tourmaline Weight: 4.60 Carats Dimension: 11.2x11.2x6.7 Mm Origin: Kunar Afghanistan Shape
Category

21st Century and Contemporary Afghan Arts and Crafts Loose Gemstones

Materials

Tourmaline

6.80 Carat Natural Loose Canary Yellow Tourmaline Untreated Ring Gem
Located in Peshawar, PK
Loose Tourmaline Weight: 6.80 Carats Dimension: 11.3x10.8x8.5 Mm Origin: Afghanistan Shape
Category

21st Century and Contemporary Afghan Arts and Crafts Loose Gemstones

Materials

Tourmaline

5.55 Carat Natural Loose Blueish Green Tourmaline Cushion Shape Gem
Located in Peshawar, PK
Loose Green Tourmaline Weight: 5.55 Carats Dimension: 9.4 x 9.2 x 8 Mm Colour: Green lagoon Origin
Category

21st Century and Contemporary Afghan Arts and Crafts Loose Gemstones

Materials

Tourmaline

6.60 Carats Natural Loose Blue Indicolite Tourmaline Emerald Shape Gem
Located in Peshawar, PK
Loose Indicolite Tourmaline Weight: 6.60 Carats Dimension: 15.6x8.7x5.5 Mm Origin: Kunar
Category

21st Century and Contemporary Afghan Arts and Crafts Loose Gemstones

Materials

Indicolite, Tourmaline

6.65 Carats Asscher Cut Loose Green Seafoam Tourmaline Ring Gem
Located in Peshawar, PK
Loose Tourmaline Weight: 6.65 Carats Dimension: 10.8x10.3x7.9 Mm Origin: Kunar Afghanistan Shape
Category

21st Century and Contemporary Afghan Arts and Crafts Loose Gemstones

Materials

Tourmaline

6.65 Carats Asscher Cut Loose Green Seafoam Tourmaline Ring Gem
6.65 Carats Asscher Cut Loose Green Seafoam Tourmaline Ring Gem
Free Shipping
W 0.41 in D 0.32 in L 0.43 in
3.55 Carat Natural Loose Tourmaline Set Gem For Jewellery Making
Located in Peshawar, PK
Loose Tourmaline Set Weight: 3.55 Carats Sizes: 0.90 to 1.65 Carat Origin: Afghanistan
Category

21st Century and Contemporary Afghan Arts and Crafts Loose Gemstones

Materials

Tourmaline

3.35 Carats Stunning Natural Loose Mint Green Tourmaline Ring Gem
Located in Peshawar, PK
Loose Tourmaline Weight: 3.35 Carats Dimension: 8.8x8.3x5.8 Mm Origin; Kunar Afghanistan Shape
Category

21st Century and Contemporary Afghan Arts and Crafts Loose Gemstones

Materials

Tourmaline

3.80 Carat Natural Loose Bi Colour Tourmaline Emerald Shape Gem
Located in Peshawar, PK
Loose Bi Colour Tourmaline Weight: 3.80 Carats Dimension: 11 x 7.1 x 5.4 Mm Colour: Green And
Category

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

Materials

Tourmaline

1.60 Carats Natural Loose Pink Tourmaline Oval Shape Ring Gem
Located in Peshawar, PK
beauty or harnessed for its metaphysical attributes, tourmaline remains a gem of enduring fascination and
Category

21st Century and Contemporary Malagasy Arts and Crafts Loose Gemstones

Materials

Tourmaline

1.60 Carats Natural Loose Pink Tourmaline Oval Shape Ring Gem
1.60 Carats Natural Loose Pink Tourmaline Oval Shape Ring Gem
Free Shipping
W 0.27 in D 0.15 in L 0.39 in
1.02 Oval Unset Unmounted Loose Pink Tourmaline Gemstone
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This 1.02 carat oval pink tourmaline is sure to put a smile on your face! With its slightly
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Rubelite, Tourmaline

33.40 Carat Bi-Color Tourmaline Oval, Unset Loose Gemstone
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This exceptionally clean and brilliant oval facetted bi-colored tourmaline actually displays more
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Tourmaline

Fine 1.00ct Vivid Pink Orange Tourmaline Oval Cut Loose Gem 7x5.4mm
Located in Birmingham, GB
Fine 1.00ct Vivid Pink Orange Tourmaline Oval Cut Loose Gem 7x5.4mm Fine Pink Purple Tourmaline
Category

21st Century and Contemporary Loose Gemstones

Materials

Tourmaline

2.42ct Vivid Orange Yellow Tourmaline Oval Cut Loose Unique Rare Gem
Located in Birmingham, GB
2.42ct Vivid Orange Yellow Tourmaline Oval Cut Loose Unique Rare Gem 9 x 8mm Natural Yellow Orange
Category

21st Century and Contemporary Loose Gemstones

Materials

Tourmaline

3.28 Carat Bi-Color Watermelon Tourmaline, Unset Loose Gemstone
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This pretty bi-color tourmaline is a beautiful marriage of pink and green of equal saturation
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Tourmaline

Blue Green Tourmaline Ring Gem 11.35 Carat Emerald Cut Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Magnificent 11.35 carat Bluish Green Tourmaline emerald cut gem, offered loose to an avid gemstone
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline

Blue Green Tourmaline Ring Gem 5.05 Carat Cushion Unmounted Loose Gemstone
By Tamir
Located in Beverly Hills, CA
5.05 carat unisex Blue-Green Tourmaline cushion loose gemstone, offered unmounted to someone very
Category

21st Century and Contemporary Contemporary Loose Gemstones

Materials

Tourmaline

Blue Green Tourmaline Gem 9.64 Carat Unset Emerald Cut Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Exclusive 9.64 carat elongated emerald-cut Bluish Green Tourmaline gem offered loose to a very
Category

21st Century and Contemporary Afghan Contemporary Loose Gemstones

Materials

Tourmaline, Other

10.37 Carat Paraiba Tourmaline Cushion, Loose Gemstone, GIA Certified
By Sarosi By Timeless Gems
Located in Los Angeles, CA
” tourmaline from Mozambique, this loupe-clean gem weighs 10.37 carats and measures 15.49 x 12.62 x 8.12
Category

21st Century and Contemporary Mozambican Artisan Loose Gemstones

Materials

Tourmaline, Paraiba

Peach Tourmaline Ring Gem 10.36 Carat Antique Pear Shape Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Exquisite 10.36 carat Peach Tourmaline antique pear shape gem, offered loose to a gemstone lover
Category

21st Century and Contemporary Mozambican Contemporary Loose Gemstones

Materials

Tourmaline, Other

Mint Green Tourmaline Ring Gem 4.78 Carat Unmounted Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Gorgeous 4.78 carat Mint Green Tourmaline cushion loose gemstone, offered unmounted to a devoted
Category

21st Century and Contemporary Mozambican Contemporary Loose Gemstones

Materials

Tourmaline

Mint Green Tourmaline Ring Gem 4.52 Carat Unmounted Trillion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Unique 4.52 carat Mint Green Tourmaline Trillion loose gemstone, offered unmounted to someone
Category

21st Century and Contemporary Afghan Contemporary Loose Gemstones

Materials

Tourmaline

Mint Green Tourmaline Ring Gem 4.49 Carat Unmounted Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Fantastic 4.49 carat Mint Green Tourmaline cushion loose gemstone, offered unmounted to someone
Category

21st Century and Contemporary Afghan Contemporary Loose Gemstones

Materials

Tourmaline

Blue Indicolite Tourmaline Ring Gem 8.20 Carat Emerald Cut Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Exceptional 8.20 carat exotic Indicolite Tourmaline gem, offered loose to a fine gemstone collector
Category

21st Century and Contemporary Namibian Modern Loose Gemstones

Materials

Tourmaline, Indicolite

Mint Green Tourmaline Ring Gem 3.46 Carat Unmounted Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Vibrant 3.46 carat Mint Green Tourmaline cushion loose gemstone, offered unmounted to someone very
Category

21st Century and Contemporary Afghan Contemporary Loose Gemstones

Materials

Tourmaline

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Loose Tourmaline Gems For Sale on 1stDibs

Find an expansive variety of loose tourmaline gems available on 1stDibs. Frequently made of 18k Gold, Gold and Platinum, these items were constructed with great care. There are many different pieces in our collection of loose tourmaline gems to choose from, but Modern and Contemporary loose tourmaline gems are of considerable interest. Many examples in our inventory of these items are appealing no matter their origins, but Merkaba, Sarosi By Timeless Gems and Tamir produced popular versions that are worth a look. Today, if you’re looking for cushion cut loose tourmaline gems and are unable to find the perfect match, our selection also includes oval cut and emerald cut alternatives. When shopping our range of loose tourmaline gems, you’ll find that there are less available pieces for men today than there are for women.

How Much are Loose Tourmaline Gems?

On average, loose tourmaline gems at 1stDibs sell for $6,470, while they’re typically $550 on the low end and $190,905 for the highest priced versions of this item.

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.