Untreated Natural Gems: Authentic Genuine Gemstones GemSelect

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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Gemstones A-Z

Buy Untreated Gemstones

4.43 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7.1 x 5 mm

0.95 carat Half Drilled Heart Cabochon Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 6.3 x 6.1 mm

0.21 ct White Diamond, 3 mm Diamond Cut From India

5.18 ct Oval Prehnite, 9.4 x 7.3 mm From South Africa

3.92 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.1 x 10 mm

3.17 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.1 x 10.1 mm

3.22 carat Square Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 5.1 x 5.1 mm

14.8 ct Yellow Quartz, 15.2 x 14.8 mm Asscher Cut From Brazil

78.66 ct Oval Jasper, 47.1 x 27.1 mm From Indonesia

2.19 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gem, 11.9 x 6 mm

18.79 carat Black Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 19.2 x 16.1 mm

10.34 ct Oval Black Opal, 18.4 x 13.9 mm From Ethiopia

2.16 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gems, 7.1 x 5.1 mm

4.06 ct Oval Rutile Quartz, 12.8 x 8.8 mm From India

97.93 ct Carved Smoky Quartz, 39.5 x 27.1 mm From Brazil

0.7 carat Blue Sapphire, Marquise-Cut loose Sapphire from Madagascar, Natural Gem, 7.7 x 4 mm

1.59 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.1 x 6 mm

6.52 ct Green Agate, 11.6 x 11.1 mm Oval Cut From India

2.3 ct Red Agate, 6.1 x 4 mm Oval Cut From India

23.68 ct Green Aventurine, 19.5 mm Round Cut From Brazil

4.73 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12.2 x 10.1 mm

0.74 ct Loose Orange Sapphire, 5.8 x 4.8 mm Oval Cut From Madagascar

1.4 carat Square Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 4.9 x 4.8 mm

1.07 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 9.7 x 7.4 mm

6.28 ct Green Apatite, 9.9 x 9.8 mm Asscher Cut From Madagascar

1.85 ct Orange Moonstone, 7 x 7 mm Cushion Cut From India

1.59 ct Oval Prehnite, 7.5 x 6.3 mm From South Africa

2.23 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 6.1 x 4.1 mm

0.39 ct Loose Orange Sapphire, 5 x 2.6 mm Marquise Cut From Tanzania

79.66 ct Oval Agate, 26.8 x 23.9 mm From Indonesia

0.65 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5.2 x 4 mm

23.72 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 20 x 14.9 mm

Gemstone Information

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