1.75 Carat Natural Loose Blue Tanzanite Stone Pear Cut Tanzanian Gemstone
Located in Bangkok, TH
Weight 1.75 carat Dimensions 9.2x7x4.7mm Treatment None Origin Tanzanian Clarity Loup Clean Shape Cut Pear This magnificent 1.75-carat natural blue tanzanite captivates with ...
Tanzanite
$640Sale Price|20% Off
2.45 Carat Natural Loose Blue Tanzanite Stone Pear Cut Tanzanian Gemstone
Located in Bangkok, TH
Weight 2.45 carat Dimensions 11x8x4.2mm Treatment None Origin Tanzanian Clarity Eye Clean Shape Cut Pear This magnificent 2.45-carat natural blue tanzanite captivates with a...
Tanzanite
$360Sale Price|20% Off
2.10 Carat Natural Loose Blue Tanzanite Stone Oval Cut Tanzanian Gemstone
Located in Bangkok, TH
Weight 2.10 carat Dimensions 9.3x7.2x4.5mm Treatment None Origin Tanzanian Clarity VVS Shape Cut Oval This 2.10 Carat Natural Loose Blue Tanzanite showcases the enchanting be...
Tanzanite
2 Carved Tanzanite Stones Cts 29.05
Located in Hong Kong, HK
These two exquisite carved Tanzanite stones, totaling 29.05 carats, showcase the unique beauty of this rare gemstone. Mined from the only known source in Tanzania, Tanzanite is kno...
Tanzanite
$468Sale Price|20% Off
4.24 carats Blue Tanzanite Stone Pair Oval Shaped Tanzanian Gemstone
Located in Bangkok, TH
Weight 4.24 carats Dimensions 9x7x5 mm Treatment heated Origin Tanzania Clarity VVS Shape oval Cut Faceted This exquisite pair of blue tanzanite gemstones weighs a total of...
Tanzanite
$376Sale Price|20% Off
Heart Shaped Blue Tanzanite Stone Pair 2.35 carats Natural Tanzanian Gemstone
Located in Bangkok, TH
Weight 2.35 carats Dimensions 6.6 x 6.8 x 4.5 mm Treatment Heated Origin Tanzania Clarity Eye Clean Shape Heart Cut Heart Introducing an exquisite pair of Heart Shaped Blue ...
Tanzanite
Round Cut Loose 4.95 Carat Tanzanite Stone, Deep Blue Color
Located in Aliso Viejo, CA
Round Tanzanite stone measures 9.94 mm in diameter and 7.70 in depth, weighing 4.95 carat. The color is a deep blue, with brilliant faceting. GIA Gemologist inspected and evaluated.
Tanzanite
Fantastic Natural Loose Tanzanite Gemstone 2.85 Carats Tanzanite From Tanzania
Located in Bangkok, TH
Fantastic Natural Loose Tanzanite Gemstone, Available For Sale At Wholesale Price Natural High Quality 2.85 Carats SI Clarity Loose Tanzanite Stone From Tanzania.
Tanzanite
Sold
W 0.26 in D 0.18 in L 0.27 in
Heart Shaped Loose Tanzanite Set No Reviews 4.80 Carats '1.20 Carat Each'
Located in Bangkok, TH
Product Information: GEMSTONE TYPE Heart shaped Tanzanite set WEIGHT 4.80 carats (1.20 carat each) DIMENSIONS 6.6 x 6.8 x 4.5 mm CLARITY Eye Clean CUT Faceted Heart SHAPE Heart ORIGI...
Tanzanite
Sold
W 0.35 in D 0.25 in L 0.47 in
Pear Shaped Blue Tanzanite Stone 4.50 carats Natural Tanzanian Gemstone
Located in Bangkok, TH
Weight 4.50 carats Dimensions 11.8 x 8.8 x 6.35 mm Treatment Heated Origin Tanzania Clarity loupe clean Shape Pear Cut Pear A striking and rare gem, this natural Tanzanian ...
Tanzanite
Sold
W 0.36 in D 0.29 in L 0.43 in
6.25 Carats AAA+ Grade Blue Tanzanite Stone Natural Tanzanian Gemstone
Located in Bangkok, TH
Weight 6.25 carats Dimensions 10.8x9.0x7.3 mm Treatment Heated Clarity loupe clean Origin Tanzania This magnificent 6.25 carats AAA+ Grade Blue Tanzanite Stone embodies the ep...
Tanzanite
Sold
W 0.28 in D 0.2 in L 0.36 in
Opalescent Blue Tanzanite Stone Pair 4.25 carats Oval Shaped Tanzanian Gemstone
Located in Bangkok, TH
Weight 4.25 carats Dimensions 9 x 7 x 5 mm Treatment Heated Clarity Eye Clean Origin Tanzania Shape Oval Cut Fancy Oval Discover a captivating pair of natural Tanzanian gems...
Tanzanite
Sold
W 0.44 in D 0.16 in L 0.41 in
3.05 Carats Heart Shaped Blue Tanzanite Stone Natural Tanzanian Gemstone
Located in Bangkok, TH
Weight 3.05 carats Dimensions 10.3x11.0x4.8 mm Treatment Heated Origin Tanzania Clarity SI (there is a crack but will not break the stone) Shape heart Cut heart The 3.05-car...
Tanzanite
Exquisite Natural Blue Tanzanite Gemstone 2.80 Carats Fine Jewelry Faceted Stone
Located in Bangkok, TH
Exquisite Natural Blue Tanzanite Gemstone, Available For Sale At Wholesale Price Natural High Quality 2.80 Carats Loupe Clean Clarity Loose Tanzanite Stone From Tanzania.
Tanzanite
Sold
W 0.3 in D 0.18 in L 0.38 in
2.80 carats Blue Tanzanite Stone Mix Cushion Cut Natural Tanzanian Gemstone
Located in Bangkok, TH
Weight 2.80 carats Dimensions 9.6x7.4x4.5 mm Treatment none Origin Tanzania Clarity VVS Shape Cushion Cut Mix Cushion Behold the captivating allure of a 2.80-carat Blue Tanzan...
Tanzanite
Sold
W 0.47 in D 0.33 in L 0.47 in
Tanzanite Cushion Cut Gem – Rare Luxury Stone for Custom Jewelry & Collectors
By Merkaba
Located in Beverly Hills, CA
Introducing a stunning 8.07 carat Tanzanite, skillfully crafted into an elegant cushion cut and offered loose for a lady or gentleman with an appreciation for rare gemstones.
Tanzanite
Sold
W 0.38 in D 0.26 in L 0.46 in
4.70 Carats AAA+ Grade Tanzanite Stone Oval Cut Natural Tanzanian Gemstone
Located in Bangkok, TH
Weight 4.70 carats Dimensions 11.5x9.6x6.4 mm Treatment Heated Origin Tanzania Clarity loupe clean Shape oval Cut fancy oval This exquisite 4.70 carats AAA+ Grade Tanzanite ...
Tanzanite
Sold
W 0.33 in D 0.17 in L 0.47 in
Certified 2.82 carats Blue Tanzanite Stone Oval Cut Natural Tanzanian Gemstone
Located in Bangkok, TH
Weight 2.82 carats Dimensions 11.78x8.32x4.26 mm Treatment Heated Origin Tanzania Clarity loupe clean Shape oval Cut fancy oval Crafted from the rarest and most exceptional ...
Tanzanite
Sold
W 0.36 in D 0.29 in L 0.51 in
5.90 Carats AAA+ Grade Tanzanite Stone Oval Cut Natural Tanzanian Gemstone
Located in Bangkok, TH
Weight 5.90 carats Dimensions 12.8x9.05x7.12 mm Treatment Heated Origin Tanzania Clarity loupe clean Shape oval Cut fancy oval Crafted from the rarest and most exceptional q...
Tanzanite
AAA Quality Soft Blue Tanzanite Stone 3.60 Carats For Ring Jewelry
Located in Bangkok, TH
AAA Quality Soft Blue Tanzanite Stone of 3.60 Carat from Tanzania has a wonderful cut in a Heart shape, incredible Blue color. Great brilliance. This gem is totally Loupe Clean Clari...
Tanzanite
Top Quality 10.45 Carats Tanzanite Hexagon 3 Pieces Cut Stone Natural Gemstone
Located in Jaipur, RJ
Top Quality 10.45 Carats Tanzanite Hexagon 3 Pieces Cut Stone Natural Gemstone Gemstone: tanzanite Shape: Hexagon cut stone Carat weight: 10.45 carats Size - 11.5x8 to 15x8 mm Quant...
Tanzanite
Top Quality 9.45 Carats Tanzanite Pear Cut Stone For Fine Jewelry Natural Gem
Located in Jaipur, RJ
Top Quality 9.45 Carats Tanzanite Pear Cut Stone For Fine Jewelry Natural Gem Gemstone: tanzanite Shape: Pear cut stone Carat weight: 9.45 carats Size - 13.5x9 mm Quantity - 2 Pieces
Tanzanite
Top Quality 7.97 Carats Tanzanite Pear Cut Stone For Fine Jewelry Natural Gem
Located in Jaipur, RJ
Top Quality 7.97 Carats Tanzanite Pair Fine Jewelry Pear Cut Stone Natural Gem Gemstone: tanzanite Shape: Pear cut stone Carat weight: 7.97 carats Size - 16x9 mm Quantity - 2 Pieces
Tanzanite
Sold
H 5 in W 8 in L 14 in
Top Quality 8.89 Carats Tanzanite Hexagon Cut Stone For Fine Jewelry Natural Gem
Located in Jaipur, RJ
Top Quality 8.89 Carats Tanzanite Hexagon Cut Stone For Fine Jewelry Natural Gem Gemstone: tanzanite Shape: Hexagon cut stone Carat weight: 8.89 carats Size - 14x8x5 mm Quantity - 2...
Tanzanite
Sold
H 4.5 in W 7.5 in L 14 in
Top Quality 3.98 Carats Tanzanite Shield Cut Stone For Fine Jewelry Natural Gem
Located in Jaipur, RJ
Top Quality 3.98 Carats Tanzanite Shield Cut Stone For Fine Jewelry Natural Gem Gemstone: tanzanite Shape: Shield cut stone Carat weight: 3.98 carats Size - 14x7.5x4.5 mm Quantity -...
Tanzanite
Natural AAA Quality Tanzanite Gemstone 4.15 Carats Tanzanite Ring Jewelry
Located in Bangkok, TH
Tanzanite Stone, Available For Sale At Wholesale Price Natural High Quality 4.15 Carats Loupe Clean Clarity Loose Tanzanite Stone From Tanzania.
Tanzanite
Exceptional Natural Blue Tanzanite Gemstone 3.35 Carats Tanzania Tanzanite Stone
Located in Bangkok, TH
Exceptional Natural Blue Tanzanite Gemstone, Available For Sale At Wholesale Price Natural High Quality 3.35 Carats Loupe Clean Clarity Loose Tanzanite Stone From Tanzania.
Tanzanite
Fantastic Soft Blue Tanzanite Gemstone 4.10 Carats Tanzanite Ring Tanzanite Gems
Located in Bangkok, TH
Product Information: GEMSTONE TYPE: Fantastic Soft Blue Tanzanite Gemstone WEIGHT: 4.10 carats DIMENSIONS: 12.4 x 8.5 x 4.5 mm CLARITY: Loupe-Clean CUT: Step-Cushion SHAPE: Cushion ...
Tanzanite
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 been certified by the Gemological Institute of America (GIA) for its authenticity.
Tanzanite
Sold
W 0.29 in D 0.18 in L 0.37 in
1.95 Carat Natural Loose Blue Tanzanite Stone Oval Cut Tanzanian Gemstone
Located in Bangkok, TH
Weight 1.95 carat Dimensions 9.2x7.2x4.5mm Treatment None Origin Tanzanian Clarity Eye Clean Shape Cut Oval This 1.95 Carat Natural Loose Blue Tanzanite from Tanzania showca...
Tanzanite
Lusturious Natural Tanzanite Heart-Shaped 1.00 CTS Tanzanite Stone From Tanzania
Located in Bangkok, TH
Tanzanite stone, Available For Sale At Wholesale Price Natural High Quality 1.00 Carats Eye Clean Clarity Loose Tanzanite From Tanzania.
Tanzanite
Sold
W 0.29 in D 0.18 in L 0.37 in
2.18 carats Blue Tanzanite Stone Oval Cut Natural Tanzanian Gemstone
Located in Bangkok, TH
Weight 2.18 carats Dimensions 9.2x7.2x4.5 mm Treatment heated Origin Tanzania Clarity VVS Shape oval Cut faceted Crafted from the rarest and most exceptional quality Tanzanit...
Tanzanite
Sold
W 0.28 in D 0.2 in L 0.36 in
Precious Blue Tanzanite Stones 6.35 carats Oval Shaped Natural Tanzanian Gems
Located in Bangkok, TH
Weight 6.35 carats Dimensions 9 x 7 x 5 mm Treatment Heated Origin Tanzania Clarity Eye Clean Shape Oval Cut Oval Discover the captivating allure of our exquisite 6.35 carat...
Tanzanite
Unique Blue Natural Tanzanite Stone 4.95 Carats Tanzanite Jewelry Tanzanite Ring
Located in Bangkok, TH
Product Information: GEMSTONE TYPE: Unique Blue Natural Tanzanite Stone WEIGHT: 4.95 carats DIMENSIONS: 8.9 x 8.5 x 6.7 mm ORIGIN: Tanzania CLARITY: Loupe Clean SHAPE: Cushion CUT: S...
Tanzanite
Sold
W 0.26 in D 0.18 in L 0.27 in
1.20 Carats Fascinating Heart Shaped Tanzanite Stone Tanzanite Ring
Located in Bangkok, TH
Fascinating Heart Shaped Tanzanite Stone is available for sale at wholesale price, natural high quality, heart shape flawless 1.20 carats loose tanzanite gemstone from Tanzania.
Tanzanite
Exquisite 3A Quality Blue Tanzanite Gemstone 4.10 Carats Tanzanite Ring Jewelry
Located in Bangkok, TH
Product Information: GEMSTONE TYPE: Exquisite 3A Quality Blue Tanzanite Gemstone WEIGHT: 4.10 carats DIMENSIONS: 10.6 x 8.3 x 5.8 mm CLARITY: Loupe-Clean CUT: Faceted SHAPE: Oval OR...
Tanzanite
Dazzling AAA Quality Natural Tanzanite 3.90 Carat Tanzanite Jewelry For Rings
Located in Bangkok, TH
Product Information: GEMSTONE TYPE: Dazzling AAA Quality Natural Tanzanite WEIGHT: 3.90 carats DIMENSIONS: 10.5 x 8.7 x 5.5 mm CLARITY: Loupe Clean SHAPE: Cushion CUT: Step Cushion O...
Tanzanite
Sold
W 0.4 in D 0.22 in L 0.4 in
3.25 Carat Tanzanite Flawless 10mmx10mm Trillion Cut - Single Loose Stone
Located in Endwell, NY
3.25 Carat Tanzanite Flawless 10mmx10mm Trillion Cut - Single Loose Stone This high-quality natural tanzanite exhibits excellent saturation with a gorgeous deep bluish-purple color,...
Tanzanite
$1,080Sale Price|20% Off
W 0.4 in D 0.23 in L 0.41 in
3.65 Carat Natural Faceted Tanzanite Pear Shape Gemstone
Located in Peshawar, PK
Faceted Tanzanite Weight: 3.65 Carats Dimension: 10.2 x 10 x 5.6 Mm Shape: Pear Color: Purple Certificate: On Demand . Hardness. Tanzanite is a slightly soft stone when compared to ...
Tanzanite
Loose Tanzanite Gemstone 3.3 ct
Located in Laguna Beach, CA
Loose 3.30-carat tanzanite gemstone. No grading lab certificate. The stone is a rectangle cushion cut, measuring 11.10 x 8.9 x 4.4mm. Attractive violet-blue color. Tests tanzanite. T...
Tanzanite
$1,600Sale Price|20% Off
4.24 Ct Natural Tanzanite Royal Blue color Gemstone Perfect cut clean clarity
Located in bangkok, TH
TZA91~ 4.24 Ct Natural Tanzanite Royal Blue Blue color Gemstone GEM DESCRIPTION Species: Tanzanite Variey: Tanzanite Weight: 4.24 ct Color:Blue Cut: Excellent Clarity: Eye cle...
Tanzanite
$640Sale Price|20% Off
2.85 Ct Natural Unheated Tanzanite Precision cut Gemstone Eye clean quality
Located in bangkok, TH
TZA169 Natural Unheated Tanzanite Precision cut Gemstone Eye clean quality Species: Natural Tanzanite Variety: Natural Tanzanite Weight: 2.85 ct Color: Blue Cut: Excell...
Tanzanite
$2,000 / item
W 0.32 in L 0.32 in
Natural Tanzanite 8x8mm Faceted Cut AAAA Color Cushion 2.48 cts Loose Gemstone
Located in New York, NY
♥ Welcome to Blue Star Gems: Your stop for Natural Loose Gemstones for Jewelry making and Best Quality and affordable Gemstones for the Price you Pay We are Loose Gemstones Manufactu...
Tanzanite
$480 / item
W 0.32 in L 0.4 in
Natural Tanzanite 10x8mm Faceted Cut AAA Color Oval 3.25 cts Loose Gemstone
Located in New York, NY
♥ Welcome to Blue Star Gems: Your stop for Natural Loose Gemstones for Jewelry making and Best Quality and affordable Gemstones for the Price you Pay We are Loose Gemstones Manufactu...
Tanzanite
$480 / item
W 0.32 in L 0.4 in
Natural Tanzanite 8x10mm AAA Oval Loose Gemstone December Birthstone 3.14 Cts
Located in New York, NY
♥ Welcome to Blue Star Gems: Your stop for Natural Loose Gemstones for Jewelry making and Best Quality and affordable Gemstones for the Price you Pay We are Loose Gemstones Manufactu...
Tanzanite
$200Sale Price|20% Off
W 0.21 in D 0.12 in L 0.32 in
1.08 carats Blue Sapphire Stone Pear Cut Natural Gemstone from Madagascar
Located in Bangkok, TH
Weight 1.08 carats Dimensions 8.1x5.3x3.0 mm Treatment heated Origin Madagascar Clarity SI Shape Pear Cut Faceted This exquisite 1.08 carat sapphire gemstone, skillfully cut i...
Blue Sapphire
$700Sale Price|20% Off
W 0.27 in D 0.24 in L 0.36 in
2.50 Carat Natural Loose Tanzanite Oval Shape Gemstone
Located in Peshawar, PK
Faceted Tanzanite Weight: 2.50 Carats Dimension: 9 x 6.7 x 5.9 Mm Shape: Oval Cut: Princess Color: Purple Certificate: On Demand . Hardness. Tanzanite is a slightly soft stone wh...
Tanzanite
$1,380 / item
W 0.36 in L 0.44 in
Natural Tanzanite 11x9mm Faceted Cut AAAA Color Oval 2.75 cts Loose Gemstone
Located in New York, NY
♥ Welcome to Blue Star Gems: Your stop for Natural Loose Gemstones for Jewelry making and Best Quality and affordable Gemstones for the Price you Pay We are Loose Gemstones Manufactu...
Tanzanite
$499 / item
W 0.32 in L 0.4 in
Natural Tanzanite 10x8mm Faceted Cut A Color Oval 2.89 cts Loose Gemstone
Located in New York, NY
♥ Welcome to Blue Star Gems: Your stop for Natural Loose Gemstones for Jewelry making and Best Quality and affordable Gemstones for the Price you Pay We are Loose Gemstones Manufactu...
Tanzanite
$2,320Sale Price|20% Off
5.32 Ct AIG Certificate Natural Tanzanite Unheated Blue color eye clean
Located in bangkok, TH
TZA137 5.32 Ct AIG Certificate Natural Tanzanite Unheated fire-cut Blue color eye clean quality Gemstone GEM DESCRIPTION Species: Natural Tanzanite Variety: Natural Tanzanite W...
Tanzanite
$176Sale Price|20% Off
Natural Pair Tanzanite gemstone 1.22carats Precision cut silver blue color
Located in bangkok, TH
Natural Pair Tanzanite gemstone precision cut tanzanite diamond style perfect luster TZB-03 Name : Tanzanite Weight: 1.22 carats 2 pcs Size : 4.41*4.37 Origins: Tanzania Luster: Good...
Tanzanite
$1,080Sale Price|20% Off
W 0.41 in D 0.23 in L 0.42 in
3.95 Carat Glamorous Faceted Tanzanite Pear Shape Gem From Tanzania
Located in Peshawar, PK
Faceted Tanzanite Weight: 3.95 Carats Dimension: 10.5 x 10.2 x 5.6 Mm Shape: Pear Color: Purple Certificate: On Demand . Hardness. Tanzanite is a slightly soft stone when compared ...
Tanzanite
$1,430 / item
W 0.36 in L 0.44 in
Natural Tanzanite 9x11mm AAA Oval Loose Gemstone December Birthstone 3.90 Cts
Located in New York, NY
♥ Welcome to Blue Star Gems: Your stop for Natural Loose Gemstones for Jewelry making and Best Quality and affordable Gemstones for the Price you Pay We are Loose Gemstones Manufactu...
Tanzanite
$1,500 / item
W 0.32 in L 0.32 in
Natural Tanzanite 8x8mm Faceted Cut AAAA Color Round 2.35 cts Loose Gemstone
Located in New York, NY
♥ Welcome to Blue Star Gems: Your stop for Natural Loose Gemstones for Jewelry making and Best Quality and affordable Gemstones for the Price you Pay We are Loose Gemstones Manufactu...
Tanzanite
$608Sale Price|42% Off
W 0.4 in D 0.24 in L 0.47 in
4.65 Carat Natural Loose Rubellite Tourmaline Stone Oval Cut Afghan Gemstone
Located in Bangkok, TH
Weight 4.65 carat Dimensions 11.8x10.1x6.0 mm Treatment None Origin Afghan Clarity VVS Shape Cut Oval Showcasing vivid beauty, this 4.65 Carat Natural Loose Rubellite Tourm...
Tourmaline
$337Sale Price|39% Off
W 0.31 in D 0.2 in L 0.39 in
Deep Pinkish Red Natural Rubellite Tourmaline Ring Loose Gemstone 3.10 Ct-Jewel
Located in Peshawar, PK
Deep Pinkish Red Natural Rubellite Tourmaline Loose Gemstone for Ring or any other Jewelry Setting-Cushion Cut from Kunar, Afghanistan!! 💎 GEMSTONE TYPE: Rubellite Tourmaline ⚖️ W...
Rubelite, Tourmaline
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.