Sign In

Sign Up
English speaking customer support only

Toll Free - USA & Canada only:
1-800-464-1640

International:
+66-39609697
Change Language
- English
- Français
- Español
- Italiano
- Deutsch
- Pусский
- 中文
- 日本語
- العربية
USD
Change Currency
- EUR = Euro
- GBP = British Pound
- USD = U.S. Dollar
- AED = United Arab Emirates Dirham
- AUD = Australian Dollar
- BHD = Bahraini Dinar
- BND = Brunei Dollar
- CAD = Canadian Dollar
- CHF = Swiss Franc
- CNY = Chinese Yuan
- CZK = Czech Koruna
- DKK = Danish Krone
- EGP = Egyptian Pound
- EUR = Euro
- GBP = British Pound
- HKD = Hong Kong Dollar
- IDR = Indonesian Rupiah
- ILS = Israeli New Shekel
- INR = Indian Rupee
- IQD = Iraqi Dinar
- JOD = Jordanian Dinar
- JPY = Japanese Yen
- KRW = South Korean Won
- KWD = Kuwaiti Dinar
- MXN = Mexican Peso
- MYR = Malaysian Ringgit
- NOK = Norwegian Krone
- NZD = New Zealand Dollar
- OMR = Omani Rial
- PHP = Philippine Piso
- PLN = Polish Złoty
- QAR = Qatari Riyal
- RUB = Russian Ruble
- SAR = Saudi Riyal
- SEK = Swedish Krona
- SGD = Singapore Dollar
- TWD = New Taiwan Dollar
- USD = U.S. Dollar
- VND = Vietnamese Dồng
- ZAR = South African Rand

Gemstone Information

If you're looking for accurate and useful gemstone information, we can help you! Over the years we've put together the most comprehensive library of gemstone information you'll find on the Internet.

As one of the largest online dealers in fine gemstones, we've learned a lot about gems and the gem market. We're still learning every day and we are glad to share our knowledge with everyone who shares our interest in gemstones.

We're located in Chanthaburi, Thailand, an international center for processing and trading colored gemstones. Traders from around the world bring rough stone from the mines to Chanthaburi to be cut and polished. Hundreds of small factories here process the material and we have a chance to buy virtually every type of colored gemstone on the market.

Being an educated buyer is key to finding the gems you want at the best price. To that end, we have created our library of gem information.

If you'd like an overview of all the different gemstone types (with photos), a good place to start is with our gemstone type list. Another good way to view all the gemstones is by color. We have an illustrated chart that will show you all the different gems grouped by color (red, pink, blue, green, yellow, violet, orange, white, brown, gray, black and multicolor).

Once you find the gems that interest you, go to our gem info pages and find the information page for that gemstone. Each information page will tell you the color range in that particular gem, where deposits are found, and whether the gem is routinely treated. You also find useful gemological data about each gem and the legends and lore associated with it throughout history.

If you're interested in gemological reference information, we've put together some useful charts and lists to compare different gem varieties. You'll find a refractive index chart for about 60 gemstone varieties and a similar chart for gem hardness. You even find a chart that will show you the dispersion (or 'fire') ratings for all the different gemstones. We've also put together a chart showing the cleavage characteristics of all the different gemstones.

One topic that every buyer should understand is the way that different gemstones vary in density. The technical term for density in gemology is specific gravity and a gemstone with a higher specific gravity will be smaller in the same carat weight than a gem with a lower density. Buyers are sometimes surprised when they buy high density gems like spessartite garnet, zircon and sapphire, all of which have a higher density than diamond.

Information is always useful, but what about useful advice? We are always forthcoming with our opinions about which gems are worth buying and at what price, and what to look for in a fine sapphire, tourmaline or garnet. See our gemstone articles for dozens of pieces written by the GemSelect staff, on topics ranging from best value gemstones to sapphire prices to how to buy gems at wholesale prices.

About Us

Gemstone Information Sign up for our Newsletter

Overall Rating -> 9

Easy to use and the filters were of much help!

Posted By Diyana in March, 2022

Source: Bizrate

Overall Rating -> 10

easy to use and good products

Posted By Fishman55 in August, 2022

Source: Bizrate

Overall Rating -> 10

I have purchased from Gem Select in the past and have been very impressed with the quality of the product Always received as pictured.

Posted By Babs in October, 2022

Source: Bizrate

Overall Rating -> 10

I love the variety of stones available, and especially that I'm not buying from a stock image -- the stone I see online is the actual one I'm getting.

Posted By Kel in January, 2023

Source: Bizrate

Overall Rating -> 10

Great experiences I’ve shopped with you several times and always recommend this site for anyone in search of stones

Posted By Kay in September, 2022

Source: Bizrate

Overall Rating -> 10

This web site is like heaven lol. I am a rock hound and I am a Christian and we represent rocks in our lives. The Diamond is has to be heated a lot and we are all jewels of God. I have a lot of rocks at home. My Husband gives the eye roll when i show him more rocks lol Uh life is good lol. ha ha

Posted By Bonnie in June, 2022

Source: Bizrate

Overall Rating -> 10

I was looking for Star Sapphires, not blue sapphires. In the past, I boughtBlack Star, I love it! Today, I ordered aPurple Star. I gave rings made with the gems.

Posted By Sunny in June, 2022

Source: Bizrate

Carat Weight

Gemstone Carat Weight - Gemstone Information - GemSelect ...

Caring for Gemstones

Gemstone Care - Gemstone Information - GemSelect ...

Gemstone Type List

Gemstone Type List: Guide to Precious & Semi-Precious Color Gems: GemSelect ...

Minerals, Rocks and Gems

Minerals, Rocks and Gems ...

Pink Gemstones for Jewelry

Pink Gemstones for Jewelry, Shop Pastel Pink to Hot Pink Gems ...