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Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
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2.70ct Green Tourmaline, Emerald Cut, VS

2.70ct Green Tourmaline, Emerald Cut, VS

18.9 x 4.3 mm

$ 59.16

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37.13ct Blue Sodalite, Oval, Opaque

37.13ct Blue Sodalite, Oval, Opaque

33 x 21.8 mm

$ 36.98

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2.38ctw Orange Spessartite Garnet, Round, VS

2.38ctw Orange Spessartite Garnet, Round, VS

4.7 mm

$ 80.83

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1.47ct Brown Kornerupine, Oval, VS

1.47ct Brown Kornerupine, Oval, VS

8.5 x 6.4 mm

$ 122.01

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2.19ct Red Almandine Garnet, Oval, VS

2.19ct Red Almandine Garnet, Oval, VS

9 x 7 mm (calibrated)

$ 81.80

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11.64ctw Green Amazonite, Round, Opaque

11.64ctw Green Amazonite, Round, Opaque

8 mm (calibrated)

$ 28.44

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1.01ct Yellow Color-Change Diaspore, Emerald Cut, VS

1.01ct Yellow Color-Change Diaspore, Emerald Cut, VS

6.7 x 4.7 mm

$ 52.78

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1.02ct Yellow Citrine, Trillion, VS

1.02ct Yellow Citrine, Trillion, VS

7 x 7 mm (calibrated)

$ 7.82

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0.60ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

0.60ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

6.2 x 4.8 mm

$ 22.21

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0.93ct Yellow Color-Change Diaspore, Baguette, VVS-VS

0.93ct Yellow Color-Change Diaspore, Baguette, VVS-VS

12.3 x 3.5 mm

$ 49.09

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2.92ctw White Topaz, Cushion, VVS-VS

2.92ctw White Topaz, Cushion, VVS-VS

4.6 x 4.5 mm

$ 15.99

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1.30ct Gray Sillimanite Cat'S Eye, Oval, Transparent

1.30ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7 x 5 mm (calibrated)

$ 4.07

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29.59ct Multicolor Jasper, Baguette, Opaque

29.59ct Multicolor Jasper, Baguette, Opaque

22.6 x 18.8 mm

$ 18.16

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1.12ctw Gray Moonstone, Round, Translucent

1.12ctw Gray Moonstone, Round, Translucent

5 mm (calibrated)

$ 5.58

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2.32ctw Red Pyrope Garnet, Square, VS

2.32ctw Red Pyrope Garnet, Square, VS

5 x 5 mm (calibrated)

$ 17.79

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24.82ct Multicolor Pietersite, Oval, Opaque

24.82ct Multicolor Pietersite, Oval, Opaque

30 x 22 mm (calibrated)

$ 81.58

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6.74ct Violet Chalcedony, Square, Translucent

6.74ct Violet Chalcedony, Square, Translucent

12 x 12 mm (calibrated)

$ 25.18

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2.13ct Orange Moonstone, Cushion, Translucent

2.13ct Orange Moonstone, Cushion, Translucent

9 x 7 mm (calibrated)

$ 4.27

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3.67ctw Brown Smoky Quartz, Round, VVS-VS

3.67ctw Brown Smoky Quartz, Round, VVS-VS

8 mm (calibrated)

$ 6.03

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30.96ct Multicolor Jasper, Oval, Opaque

30.96ct Multicolor Jasper, Oval, Opaque

25.7 x 21.5 mm

$ 17.58

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5.82ct Multicolor Fire Agate, Fancy, Translucent

5.82ct Multicolor Fire Agate, Fancy, Translucent

15.5 x 10.4 mm

$ 41.72

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0.98ct Purple Rhodolite Garnet, Oval, VS

0.98ct Purple Rhodolite Garnet, Oval, VS

7.1 x 5.3 mm

$ 26.03

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1.12ct Purple Rhodolite Garnet, Oval, VVS

1.12ct Purple Rhodolite Garnet, Oval, VVS

7 x 5.4 mm

$ 39.04

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0.96ct Multicolor Opal, Oval, Transparent

0.96ct Multicolor Opal, Oval, Transparent

9 x 7 mm (calibrated)

$ 31.56

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Why Buy Untreated Gemstones from GemSelect?

Natural Untreated Gemstones

Our untreated gemstones are completely natural and have not undergone any enhancement processes. These gems display their original color and clarity as formed in nature, making them highly valued by collectors, jewelers, and gemstone enthusiasts.

Buy Untreated Gemstones Online

At GemSelect you can easily shop untreated gemstones online with confidence. Our inventory includes carefully sourced loose gemstones from around the world, with full transparency regarding treatments and gem origins.

Natural Untreated Loose Gemstones

Why Choose Untreated Gems?

Untreated gems are prized because they remain exactly as nature created them. Without heat or chemical treatments, these stones offer rarity and authenticity that many collectors and jewelry designers prefer.

Unheated Sapphire and Ruby

Some of the most sought-after untreated gemstones include unheated sapphire and ruby. These rare stones retain their natural color and are highly valued due to the absence of heat treatment commonly used to enhance corundum.

Gemstone Authenticity and Transparency

Every gemstone at GemSelect comes with clear treatment disclosure. When purchasing untreated stones, buyers can be confident they are receiving authentic gems that have not been altered by heat or other enhancement methods.

Untreated Gems for Custom Jewelry

Natural untreated gemstones are perfect for custom jewelry pieces. Their unique appearance ensures every ring, pendant, or pair of earrings features a one-of-a-kind gemstone created by nature.

Rare and Collectible Gemstones

Because many gemstones are routinely treated, truly untreated examples can be relatively rare. Collectors often seek untreated stones because they represent the most natural state of a gemstone.

Learn more about gemstone treatments and natural gem formation on our Gemstone Treatment Guide.

FAQs

What are untreated gemstones?

Untreated gemstones are natural gems that have not been enhanced with heat, chemicals, irradiation, or other treatments. They retain their original appearance as formed in nature.

Are untreated gemstones more valuable?

In many cases untreated gemstones are more valuable because they are rarer than treated stones. Natural color without enhancement is highly prized by collectors and investors.

How can I tell if a gemstone is untreated?

Gemstone treatment is typically determined through gemological testing. Reputable sellers like GemSelect clearly disclose whether a stone is untreated or has received any enhancements.

Which gemstones are commonly untreated?

Some gemstones frequently found untreated include garnet, spinel, peridot, and certain sapphires. However, many gem types may be treated depending on their origin and quality.

Are untreated gemstones suitable for jewelry?

Yes, untreated gemstones can be excellent for jewelry depending on their hardness and durability. Popular choices include sapphire, ruby, spinel, and garnet.

GemSelect Certified Store Reviews

GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!

Overall Rating -> 10 star ratings

I liked the selection of gems, and price. I did not like your PayPal process. I already have a PP account and you want me to sign up for another.

Posted By CLTCJH in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I have purchased stones from gem select in the past and have been very satisfied. I expect to repeat that experience with this purchase as well

Posted By Marti in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

GemSelect is always my first choice for purchasing gemstones. The fact that the gems are always exactly as described and pictured on the website has earned my trust many times over. Even when I don't buy, I still love browsing all the beautiful stones. My new favorites are the bright green Tsavorites!

Posted By Lkcisneros in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

So far So good

Posted By VH-1 in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

It's mostly good, only some item's are easier to find through the search than the menu

Posted By Wayne in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Would have bought an indigo and selenite, but neither listed. But, you do offer quite a large assortment otherwise.

Posted By JD in July, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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