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1.48 Carat Green Tsavorite Garnet Pear Shape, Unset Loose Unmounted Gemstone
By Sarosi By Timeless Gems
Located in Los Angeles, CA
very lively gemstone that would be lovely set in a ring or pendant! The perfect gift for yourself or a
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Garnet, Tsavorite

Tanzanite Earrings Loose Gemstones 4.04 Carats Unmounted Cushion
By Tamir
Located in Beverly Hills, CA
convenience we carry an extensive world-class, unmounted gemstone collection.
Category

21st Century and Contemporary Tanzanian Contemporary Loose Gemstones

Materials

Tanzanite

Rhodolite Garnet Ring Gem 5.99 Carat Antique Pear Shape Unmounted Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
world-class, unmounted gemstone collection.
Category

21st Century and Contemporary Malawian Contemporary Loose Gemstones

Materials

Garnet, Rhodolite

Green Blue Tourmaline Ring Gem 4.35 Carat Unmounted Kite Shape Loose Gemstone
By Tamir
Located in Beverly Hills, CA
call us to discuss. For your convenience we carry an extensive world-class, unmounted gemstone
Category

21st Century and Contemporary Namibian Contemporary Loose Gemstones

Materials

Tourmaline

Pink Tourmaline Ring Gem 3.80 Carat Unmounted Kite Shape Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
carry an extensive world-class, unmounted gemstone collection.
Category

21st Century and Contemporary Mozambican Contemporary Loose Gemstones

Materials

Tourmaline

Kashmir Sapphire Ring Gem 3 Carat Unheated Unmounted Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
call to explore further. Our collection boasts an extensive array of world-class, unmounted gemstones
Category

21st Century and Contemporary Indian Contemporary Loose Gemstones

Materials

Sapphire, Blue Sapphire

Tsavorite Gem 1.55 Carat Oval Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
contact us for more details. For your convenience we carry an extensive world-class, unmounted gemstone
Category

21st Century and Contemporary Unknown Modern Loose Gemstones

Materials

Garnet, Tsavorite

Tsavorite Gem 1.55 Carat Oval Loose Gemstone
Tsavorite Gem 1.55 Carat Oval Loose Gemstone
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W 0.24 in L 0.32 in
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

Rhodolite Garnet Ring Gem 9.27 Carat Unset Oval Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
contact us for more details. For your convenience we carry an extensive world-class, unmounted gemstone
Category

21st Century and Contemporary Unknown Modern Loose Gemstones

Materials

Garnet, Rhodolite

Peridot Ring Gem 18.96 Carat Oval Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
extensive world-class, unmounted gemstone collection.
Category

21st Century and Contemporary Pakistani Contemporary Loose Gemstones

Materials

Peridot

Peridot Ring Gem 18.96 Carat Oval Loose Gemstone
Peridot Ring Gem 18.96 Carat Oval Loose Gemstone
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W 0.58 in D 0.41 in L 0.73 in
Bicolor Tourmaline Ring Gem 29.22 Carat Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
, unmounted gemstone collection.
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline, Other

Pink Malaya Garnet Ring Gem 6.69 Carat Oval Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Special 6.69 carat pink Malaya Garnet oval gem, offered loose to a fine gemstone lover. Returns are
Category

21st Century and Contemporary Unknown Contemporary Loose Gemstones

Materials

Garnet, Other

Unheated Ruby Ring Gem 1.02 Carat Cushion No Heat Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
, unmounted gemstone collection.
Category

21st Century and Contemporary Mozambican Contemporary Loose Gemstones

Materials

Ruby

Blue Indicolite Tourmaline Ring Gem 8.20 Carat Emerald Cut Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
, unmounted gemstone collection.
Category

21st Century and Contemporary Namibian Modern Loose Gemstones

Materials

Tourmaline, Indicolite

Red Spinel Gem 2.96 Carat Pear Shape Mahenge Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
extensive world-class, unmounted gemstone collection.
Category

21st Century and Contemporary Unknown Modern Loose Gemstones

Materials

Spinel, Other

Mandarin Garnet Earrings Gemstone Pair 3.78 Carat Unset Oval Loose Gems
By Merkaba
Located in Beverly Hills, CA
world-class, unmounted gemstone collection.
Category

21st Century and Contemporary Nigerian Contemporary Loose Gemstones

Materials

Garnet, Mandarin Garnet

Aquamarine Earring Gemstones 9.32 Carat Marquise Loose Gems Loupe Clean
By Merkaba
Located in Beverly Hills, CA
Exceptional pair of 9.32 carats total, "loupe clean", unmounted marquise Aquamarine gemstones
Category

21st Century and Contemporary Malagasy Contemporary Loose Gemstones

Materials

Aquamarine, Beryl

Green Tourmaline Ring Gem 10.64 Carat Rectangular Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
convenience we carry an extensive world-class, unmounted gemstone collection.
Category

21st Century and Contemporary Afghan Modern Loose Gemstones

Materials

Tourmaline, Other

Tourmaline Earrings Gemstone Pair 11.26 Carat Unset Asscher Cut Loose Gems
By Merkaba
Located in Beverly Hills, CA
of 11.26 carats, offered unmounted to a fine gemstone lover. Returns are accepted and paid by us
Category

21st Century and Contemporary Nigerian Contemporary Loose Gemstones

Materials

Tourmaline

Aquamarine Earring Gemstones 11.18 Carat Kite Shaped Loose Gems Loupe Clean
By Merkaba
Located in Beverly Hills, CA
Exclusive pair of 11.18 carats total, "loupe clean", unmounted Aquamarine gemstones, offered loose
Category

21st Century and Contemporary Malagasy Contemporary Loose Gemstones

Materials

Aquamarine, Beryl

Aquamarine Earrings Gemstone Pair 17.68 Carats Kite Shape Loose Gems
By Merkaba
Located in Beverly Hills, CA
contact us for more details. For your convenience we carry an extensive world-class, unmounted gemstone
Category

21st Century and Contemporary Malagasy Modern Loose Gemstones

Materials

Aquamarine, Beryl

Chrysoberyl Ring Gem 1.49 Carat Oval Loose Gemstone Loupe Clean
By Merkaba
Located in Beverly Hills, CA
, unmounted gemstone collection.
Category

21st Century and Contemporary Nigerian Contemporary Loose Gemstones

Materials

Chrysoberyl

Chrysoberyl Ring Gem 1.49 Carat Oval Loose Gemstone Loupe Clean
Chrysoberyl Ring Gem 1.49 Carat Oval Loose Gemstone Loupe Clean
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W 0.23 in D 0.17 in L 0.31 in
Tsavorite Ring Gem 5.87 Carat Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
carry an extensive world-class, unmounted gemstone collection.
Category

21st Century and Contemporary Tanzanian Contemporary Loose Gemstones

Materials

Garnet, Tsavorite

Grey Violet Spinel Earrings Gemstone Pair 13.12 Carat Loose Gems Loupe Clean
By Merkaba
Located in Beverly Hills, CA
, unmounted gemstone collection.
Category

21st Century and Contemporary Burmese Contemporary Loose Gemstones

Materials

Spinel

Unheated Demantoid Garnet Ring Gem 4.24 Carat Ural Russia Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
us for more details. For your convenience we carry an extensive world-class, unmounted gemstone
Category

21st Century and Contemporary Russian Contemporary Loose Gemstones

Materials

Garnet, Other

1.02 Oval Unset Unmounted Loose Pink Tourmaline Gemstone
By Sarosi By Timeless Gems
Located in Los Angeles, CA
purplish pink hue and pleasing shape, this sparkling gemstone would make a very pretty ring or pendant for
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Rubelite, Tourmaline

1.57 Carat Oval Unset Loose Unmounted Aquamarine Gemstone
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This 1.57 carat aquamarine is of the finest quality, having an unusually dark, saturated color with exceptional clarity and brilliance. It measures 8.70 x 6.17 millimeters and it wou...
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Aquamarine

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

Aquamarine Ring Loose Gemstone 4.26 Carat Oval Unmounted Gem
By Tamir
Located in Beverly Hills, CA
Bright 4.26 carat Aquamarine oval loose gemstone, offered unmounted to a very special person
Category

21st Century and Contemporary Malagasy Contemporary Loose Gemstones

Materials

Aquamarine, Beryl

Aquamarine Ring Loose Gemstone 4.26 Carat Oval Unmounted Gem
Aquamarine Ring Loose Gemstone 4.26 Carat Oval Unmounted Gem
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W 0.39 in D 0.12 in L 0.49 in
Imperial Topaz Earrings Loose Gemstones 3.36 Carat Unmounted Cushions
By Merkaba
Located in Beverly Hills, CA
Bright 3.36 carat Brazilian Imperial Topaz pair of cushion loose gemstones, offered unmounted to
Category

21st Century and Contemporary Brazilian Contemporary Loose Gemstones

Materials

Topaz, Imperial Topaz

Peridot Ring Necklace Gem 7.25 Carat Unmounted Loose Gemstone
By Tamir
Located in Beverly Hills, CA
Exclusive 7.25 carat unmounted Peridot leaf-shaped gem, offered loose to a fine gemstone collector
Category

21st Century and Contemporary Pakistani Contemporary Loose Gemstones

Materials

Peridot

Peridot Ring Necklace Gem 7.25 Carat Unmounted Loose Gemstone
Peridot Ring Necklace Gem 7.25 Carat Unmounted Loose Gemstone
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W 0.36 in D 0.24 in L 0.75 in
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

3.66 Carat Unset Loose Pear Shaped Unmounted Tanzanite Gemstone
By Sarosi By Timeless Gems
Located in Los Angeles, CA
, leaving no doubt that this is a classic example of the highly prized gemstone from Tanzania, Africa. With
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Tanzanite

1.17 Carat Unset Loose Unmounted Cushion Shaped Tanzanite Gemstone
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This petite tanzanite gemstone is both gorgeous and budget-friendly! With its characteristic
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Tanzanite

Peridot Ring Gem Loose Gemstone 5.51 Carat Unmounted Stone
By Tamir
Located in Beverly Hills, CA
world-class loose gemstone collection.
Category

21st Century and Contemporary Pakistani Contemporary Loose Gemstones

Materials

Peridot

Peridot Ring Gem Loose Gemstone 5.51 Carat Unmounted Stone
Peridot Ring Gem Loose Gemstone 5.51 Carat Unmounted Stone
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W 0.42 in D 0.16 in L 0.5 in
Aquamarine Ring Gem 11.20 Carat Unmounted Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
extensive world-class loose gemstone collection.
Category

21st Century and Contemporary Mozambican Contemporary Loose Gemstones

Materials

Aquamarine, Beryl

Aquamarine Ring Gem 5.52 Carat Unmounted Marquise Loose Gemstone
By Tamir
Located in Beverly Hills, CA
Splendid 5.52 carat Aquamarine Marquise gem, offered loose to a fine gemstone lover. Dimensions
Category

21st Century and Contemporary Malagasy Contemporary Loose Gemstones

Materials

Aquamarine, Beryl

Peridot Ring Gem 4.06 Carat Unmounted Trillion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
extensive world-class loose gemstone collection.
Category

21st Century and Contemporary Pakistani Modern Loose Gemstones

Materials

Peridot

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

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

Aquamarine Gemstone Ring 4.60 Carat Loose Unmounted Pear Shape Gem
By Tamir
Located in Beverly Hills, CA
Classic 4.60 carat pear shape Aquamarine loose gemstone, offered unmounted to a sophisticated
Category

21st Century and Contemporary Mozambican Contemporary Loose Gemstones

Materials

Aquamarine, Beryl

Aquamarine Ring Loose Stone 1.85 Carat Unmounted Emerald Cut Gemstone
By Merkaba
Located in Beverly Hills, CA
1.85 Carat Aquamarine emerald-cut loose gemstone, offered unmounted to someone special. Returns are
Category

21st Century and Contemporary Mozambican Contemporary Loose Gemstones

Materials

Aquamarine, Beryl

Ametrine Stone 10.77 Carat Fancy Emerald Cut Unmounted Loose Gemstone
By Tamir
Located in Beverly Hills, CA
Exclusive 10.77 carat fancy Emerald-Cut Ametrine loose gem, offered unmounted to someone special
Category

21st Century and Contemporary Bolivian Contemporary Loose Gemstones

Materials

Citrine, Quartz, Amethyst

Spessartite Garnet Ring Gem 11.09 Carat Unmounted Oval Loose Gemstone
By Tamir
Located in Beverly Hills, CA
Bright 11.09 carat Spessartite Garnet (Mandarin Garnet) oval gem, offered loose to a fine gemstone
Category

21st Century and Contemporary Nigerian Contemporary Loose Gemstones

Materials

Garnet, Mandarin Garnet

.85 Carat Cushion Cut Unset Loose Unmounted Red Spinel Gemstone
By Sarosi By Timeless Gems
Located in Los Angeles, CA
spinel is so highly prized, especially by fine gemstone collectors. This is a truly beautiful gemstone
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Spinel

1.48 Carat Cushion Shaped Loose Unset Unmounted Red Spinel Gemstone
Located in Los Angeles, CA
prized gemstone in its own right, and for good reason. It comes in a rainbow of striking colors and is
Category

Antique 15th Century and Earlier Loose Gemstones

Materials

Spinel

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

Imperial Topaz Earrings Loose Gemstones Unmounted 2.53 Carat Yellow Pair
By Tamir
Located in Beverly Hills, CA
Striking 2.53 carat Brazilian yellow Imperial Topaz gemstone pair, offered loose. Dimensions: 8.6 x
Category

21st Century and Contemporary Brazilian Contemporary Loose Gemstones

Materials

Imperial Topaz, Topaz

Mandarin Garnet Ring Gem 2.59 Carat Unmounted Trillion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
extensive world-class loose gemstone collection.
Category

21st Century and Contemporary Nigerian Modern Loose Gemstones

Materials

Garnet, Mandarin Garnet

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

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

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

Mint Green Tourmaline Ring Gem 5.62 Carat Cushion Unmounted Loose Gemstone
By Tamir
Located in Beverly Hills, CA
Pastel Mint Green Tourmaline cushion gem, weighing a total of 5.62 carats, offered unmounted to a
Category

21st Century and Contemporary Congolese Contemporary Loose Gemstones

Materials

Tourmaline

Mint Green Tourmaline Ring Gem 7.68 Carat Unmounted Cushion Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Pristine 7.68 carat Mint Green Tourmaline cushion loose gemstone, offered unmounted to a fine gem
Category

21st Century and Contemporary Congolese Contemporary Loose Gemstones

Materials

Tourmaline

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

Red Spinel Ring Stone 5 Carat Emerald Cut Unmounted Loose Gemstone
By Merkaba
Located in Beverly Hills, CA
Exceptional and coveted 5.73 carat natural Red Spinel Emerald Cut loose gemstone, offered unmounted
Category

21st Century and Contemporary Tanzanian Contemporary Loose Gemstones

Materials

Spinel

1.90 Carat Emerald Cut Octagonal Loose Unset Unmounted Green Tourmaline Gemstone
By Sarosi By Timeless Gems
Located in Los Angeles, CA
This bright, emerald-cut green tourmaline is so lively and pretty! It weighs 1.90 carats and measures 7.22 x 6.52 millimeters, making it the perfect size for an everyday ring or pend...
Category

21st Century and Contemporary Artisan Loose Gemstones

Materials

Tourmaline

3.87 Carat Unset Loose Unmounted Oval Cat's Eye Green Tourmaline Gemstone
Located in Los Angeles, CA
This lovely green cat's eye tourmaline is a rare occurance in nature. Weighing 3.87 carats and measuring 8.72 x 8.34 x 6.12 millimeters, this is the perfect size for a ring. The clea...
Category

Antique 15th Century and Earlier Brazilian Loose Gemstones

Materials

Tourmaline

Mandarin Garnet Ring Necklace Gem 3.69 Carat Kite Shape Unmounted Loose Gemstone
By Tamir
Located in Beverly Hills, CA
3.69 carat Mandarin Garnet Kite shaped loose gemstone, offered unmounted to a unique gem collector
Category

21st Century and Contemporary Nigerian Contemporary Loose Gemstones

Materials

Garnet, Mandarin Garnet

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Unmounted Gemstones For Sale on 1stDibs

There is a broad range of unmounted gemstones for sale on 1stDibs. Modern and Contemporary are consistently popular styles when it comes to unmounted gemstones. Many examples in our inventory of these items are appealing no matter their origins, but Merkaba and Tamir produced popular versions that are worth a look. While most can agree that any pick from our collection easily elevates most outfits, but the choice of Tourmaline versions from the 4 available is guaranteed to add a special touch to your ensemble. There are many kite cut, pear cut and trillion cut unmounted gemstones for sale. There aren’t many items for men in our collection of unmounted gemstones, as most of the options available are for women.

How Much are Unmounted Gemstones?

Prices for unmounted gemstones can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $380 and can go as high as $2,624, while unmounted gemstones, on average, fetch $1,185.

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.