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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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5.87ct Pink Rose Quartz, Emerald Cut, Transparent

11 x 11 mm (calibrated)

$ 32.16

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18.98ct Multicolor Coral, Oval, Translucent

25.9 x 20.1 mm

$ 34.66

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0.79ct Brown Color-Change Garnet, Oval, VVS-VS

6 x 4.7 mm

$ 63.11

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25.15ct Brown Smoky Quartz, Oval, Transparent

25.5 x 22.3 mm

$ 27.56

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42.35ct Brown Tiger'S Eye, Oval, Opaque

31.9 x 22.6 mm

$ 36.19

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1.21ct Violet Amethyst, Square, VS

7 x 7 mm (calibrated)

$ 9.64

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1.05ct Multicolor Opal, Oval, Transparent

9 x 7 mm (calibrated)

$ 31.37

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3.31ctw Yellow Sillimanite, Oval, VVS

9 x 7 mm (calibrated)

$ 74.41

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18.39ct Violet Amethyst, Pear Shape, VVS

21.1 x 16.1 mm

$ 128.22

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0.18ctw Black Diamond, Square, Opaque

2.2 x 2.2 mm

$ 89.64

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1.59ct Red Almandine Garnet, Baguette, VVS

9.9 x 4.9 mm

$ 59.39

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3.23ct Violet Amethyst, Round, VS

10 mm (calibrated)

$ 24.77

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2.34ctw Green Demantoid Garnet, Oval, VS

6.2 x 4.4 mm

$ 256.37

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34.87ctw Gray Hematite, Emerald Cut, Opaque

20 x 15 mm (calibrated)

$ 34.00

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9.65ct Violet Amethyst, Pear Shape, VVS-VS

18 x 13 mm (calibrated)

$ 73.37

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0.82ct Yellow Morganite, Cushion, VS

6 x 6 mm (calibrated)

$ 49.41

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8.62ct Multicolor Agate, Fancy, Translucent

17.1 x 7.2 mm

$ 15.10

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2.40ct Green Prehnite, Oval, Transparent/Translucent

9.2 x 7.9 mm

$ 7.10

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6.24ct Brown Smoky Quartz, Flower Cut, Transparent

14.1 x 10 mm

$ 23.17

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1.46ct Orange Zircon, Round, VVS

6.5 mm (calibrated)

$ 31.99

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1.42ctw Yellow Citrine, Heart, VVS-VS

6 x 6 mm (calibrated)

$ 11.31

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5.43ct Multicolor Fire Agate, Pear Shape, Opaque

14 x 10 mm (calibrated)

$ 45.98

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0.68ct Yellow Color-Change Diaspore, Cushion, VS

5.6 x 4.8 mm

$ 23.85

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2.54ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 22.23

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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 -> 9 star ratings

Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly

Posted By Ron T in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Good, hope gem quality is good and genuine

Posted By Varun in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

good navigation and simple interface.

Posted By Dave in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I am filling a small treasure chest and picked a nice amethyst.

Posted By VinnyD in August, 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

Overall Rating -> 10 star ratings

Recomendado Totalmente Los Productos Se Entregaron A Tiempo

Posted By Alexis in May, 2026
Source: Bizrate
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