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Home Gemstones Untreated Gemstones

Untreated Gemstones

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

Untreated Gemstones Weight
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Yellow Untreated Gemstones
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14.98ct Multicolor Boulder Opal, Cushion, Opaque

20.2 x 13.9 mm

$ 87.03

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1.17ct Violet Spinel, Cushion, VVS

5.6 x 5.6 mm

$ 194.22

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2.17ct Brown Tiger'S Eye, Marquise, Opaque

12 x 6 mm (calibrated)

$ 2.12

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27.42ct Multicolor Obsidian, Cushion, Opaque

30 x 22 mm (calibrated)

$ 23.12

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0.97ct Yellow Color-Change Garnet, Cushion, VS-SI

6.8 x 4.2 mm

$ 86.09

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2.68ctw White Sillimanite Cat'S Eye, Oval, Transparent

6.5 x 6.2 mm

$ 8.90

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2.47ct Green Tourmaline, Emerald Cut, VVS

22.6 x 3.6 mm

$ 81.18

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34.44ct Multicolor Tiger'S Eye Matrix, Trillion, Opaque

36.2 x 25 mm

$ 16.29

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35.81ct Pink Rose Quartz, Pear Shape, Transparent

27 x 20 mm (calibrated)

$ 78.47

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15.89ct Yellow Apatite, Emerald Cut, VS

15 x 15 mm (calibrated)

$ 609.32

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8.49ct Multicolor Ruby-Zoisite, Trillion, Opaque

16.3 x 10.8 mm

$ 23.25

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33.60ct Multicolor Labradorite, Round, Translucent

25 mm

$ 74.29

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8.60ct Green Actinolite Cat'S Eye, Oval, Translucent

16.2 x 13.4 mm

$ 59.96

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0.90ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

7 x 4.4 mm

$ 27.61

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2.38ct Multicolor Spectrolite, Oval, Opaque

10 x 8 mm (calibrated)

$ 23.80

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21.85ct Multicolor Amethyst Geode Slice, Fancy, Transparent

24 x 21.7 mm

$ 23.29

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43.05ct Multicolor Jasper, Pear Shape, Opaque

34.7 x 26.7 mm

$ 35.37

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15.37ct Blue Aquamarine, Emerald Cut, VVS

23.7 x 9.2 mm

$ 2,551.42

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12.47ct Multicolor Rainbow Pyrite, Oval, Opaque

22.2 x 12.4 mm

$ 32.17

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57.58ct Multicolor Jasper, Oval, Opaque

44.5 x 28.7 mm

$ 48.57

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4.61ctw Multicolor Spectrolite, Oval, Opaque

10 x 8 mm (calibrated)

$ 21.07

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27.15ct Orange Moonstone, Round, Translucent

19 mm (calibrated)

$ 45.29

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23.14ct Multicolor Quartz With Marcasite, Oval, Transparent

23.8 x 16.1 mm

$ 152.11

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20.59ct Violet Amethyst, Cushion, VVS

18 x 18 mm (calibrated)

$ 119.63

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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

Recomendado Totalmente Los Productos Se Entregaron A Tiempo

Posted By Alexis in May, 2026
Source: Bizrate

Overall Rating -> 7 star ratings

Easy, quick.

Posted By Mich in June, 2026
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

Overall Rating -> 10 star ratings

Gem Select has a user friendly website and the product is very good as is the price. The gems are described accurately and I always get what I think I'm getting.

Posted By Happy Customer in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

A pleasant experience and many choices to choose from

Posted By Krackenking in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

It was good. There was a large selection at prices I could afford.

Posted By Zorah in February, 2026
Source: Bizrate
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