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Untreated Gemstones

The idea of treating gemstones is nothing new. Nowadays, gem treatments are a way to supply the global demand for colored gemstones with a very limited 'natural' supply. Many gem types are always, or almost always, treated. The most common gem treatment is heat treatment, which is routinely applied to ruby and sapphire. Other gems such as emerald, tanzanite, blue zircon and blue topaz, are generally treated to produce their distinctive color; in fact it's virtually impossible to buy blue topaz that has not been irradiated. Even for the most expert gem buyers, determining whether a gemstone has been treated or enhanced is not always easy, and usually requires much more than just a jeweler's loupe.

Even with advanced gemological equipment, many treatments are still almost impossible to detect. So for many gem and jewelry buyers, one of the best ways to ensure the gem they're acquiring is completely natural and untreated, is through the selective buying of gemstone varieties that for the most part are never enhanced in any way. If you're searching for untreated gemstones, you may be surprised to discover we carry over 100 different untreated gem types.

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Thank you for trusting us with your purchase!

Overall Rating -> 10 star ratings

After working with and polishing low-grade, rough fire-agate, only to be disappointed, this shop was nirvana. The costs of some gems might seem high, but I have easily spent the same amount rough polishing lousy material only to get a few hints of fire. If you want Fire-agates, BUY the agates you want. These are excellent specimens and are worth considering.

Posted By Jim in October, 2022
Source: Bizrate

Overall Rating -> 8 star ratings

Everything was good about this order except I was a little disappointed in the product because it was so small. This is the first time that I have ever bought a gem so I was very unfamiliar with the sizes mainly because measurements were in metric.

Posted By Bgq162 in September, 2022
Source: Bizrate

Overall Rating -> 10 star ratings

Excellent selection of products. Website easy to navigate and make purchases.

Posted By David in April, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

It was fast purchasing procesos, very clear and precise, loved It

Posted By Sebastian in March, 2023
Source: Bizrate

Overall Rating -> 9 star ratings

I was led to the site by google when looking for specific green sapphire briolette. Site is well laid out and very easy to purchase from. Hope the stone is as satisfying!

Posted By Flutie in March, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Website is pretty easy to use. Some items do not have enough information like origin of the item or if they are natural or lab created. Not enough pictures/some pictures of products are not clear. This might possibly just be a mobile phone user problem however.

Posted By Lolo in October, 2022
Source: Bizrate

Overall Rating -> 10 star ratings

Great site easy to find what I'm looking for

Posted By Gero in December, 2022
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection that I couldn't find locally and very good and prompt shipping and delivery via Fedex.

Posted By Gala in January, 2023
Source: Bizrate

Overall Rating -> 8 star ratings

purchased birthstones to be mounted into stud earrings as a gift for a friend's gift

Posted By MI photo in May, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

I was very happy with the simplicity and prices of gemselect.com. the sites filters and navigation style made it simple to find exactly what I was looking for. I will definitely be buying from gemselect ago. Compared to other online stone sellers, the prices and availability of gemselect was amazing.

Posted By Jl1996 in November, 2022
Source: Bizrate

Overall Rating -> 10 star ratings

Bought my first set of gemstones of gemselect to start off my collection. Everything is what it says it is, 100% legit. They even send u a pamphlet for every gem you order even the $1 ones lol. Good store.

Posted By SuperBee in March, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

all its ok

Posted By PETER in December, 2022
Source: Bizrate

Overall Rating -> 10 star ratings

Excellent experience!

Posted By Steph in April, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Everything was perfect, the stone was gorgeous, and delivery was on time. I cannot add anything else.

Posted By DesertDweller in March, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Great service. I understand supply depends on other factors so I don't mind checking back from time to time. I do, however, have a problem with the mobile website trying to sign me up for emails when all I'm doing is a simple search

Posted By Musicalkrystal in July, 2022
Source: Bizrate
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More Shapes
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  • Half Moon Faceted
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  • Half-Drilled Heart Cabochon
  • Half-Drilled Heart Checkerboard Facet
  • Half-Drilled Heart Checkerboard (double sided
  • Half-Drilled Sphere
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  • Heart Cabochon
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  • Heart Checkerboard (double sided)
  • Heart Concave Cut
  • Heart Crystal Cluster
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  • Hexagon Crystal Cluster
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  • Marquise Buff-Top
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  • Marquise Checkerboard
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  • Marquise Concave Cut
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  • Octagon / Scissor Cut
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  • Oval Fancy Facet
  • Oval Mixed Cut
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  • Round Checkerboard (double sided)
  • Round Concave Cut
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  • Triangle Facet
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  • Undrilled Briolette Teardrop
Popular Gemstones
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All Gemstones (145)
A B C D E F G H I J K L M N O P Q R S T V Z
  • Actinolite Cat's Eye
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  • Amethyst Geode Slice
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  • Color Change Gemstones
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  • Druzy Variscite
  • Emerald
  • Enstatite
  • Fire Agate
  • Fire Opal
  • Fluorite
  • Fossil Coral
  • Garnet
  • Golden Beryl
  • Grandidierite
  • Grossularite Garnet
  • Hawk's Eye
  • Hematite
  • Hemimorphite
  • Hemimorphite Druzy
  • Hessonite Garnet
  • Howlite
  • Idocrase
  • Imperial Topaz
  • Iolite
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  • Kornerupine
  • Kunzite
  • Kyanite
  • Labradorite
  • Lapis Lazuli
  • Larimar
  • Malachite
  • Malaya Garnet
  • Mali Garnet
  • Maw-Sit-Sit
  • Moonstone
  • Morganite
  • Mother Of Pearl
  • Mystic Quartz
  • Mystic Topaz
  • Nuummite
  • Obsidian
  • Onyx
  • Opal
  • Opal Doublet
  • Opal In Matrix
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  • Pyrope Garnet
  • Quartz
  • Quartz Cat's Eye
  • Quartz With Hedenbergite
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  • Rainbow Moonstone
  • Rainbow Pyrite
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  • Ruby
  • Ruby In Fuchsite
  • Ruby-Zoisite
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  • Sillimanite
  • Sillimanite Cat's Eye
  • Smithsonite
  • Smoky Quartz
  • Snowflake Obsidian
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  • Spectrolite
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart