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Untreated Gemstones

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

Untreated Gemstones Weight
Untreated Gemstones Size
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2.34ct Green Prehnite, Oval, Transparent

8.6 x 7.6 mm

$ 15.10

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2.74ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 16.38

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18.13ct Multicolor Jasper, Trillion, Opaque

21.2 x 20.6 mm

$ 10.29

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6.27ct Green Prehnite, Fancy, Translucent

16 x 11 mm

$ 10.30

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8.81ct Multicolor Cinnabar, Cushion, Opaque

18 x 13 mm (calibrated)

$ 10.31

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10.13ct Brown Smoky Quartz, Flower Cut, Transparent

16 x 12 mm (calibrated)

$ 37.62

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1.30ct Yellow Beryl, Trillion, VVS-VS

8 x 8 mm (calibrated)

$ 31.08

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0.70ct Yellow Color-Change Diaspore, Emerald Cut, VS

6.6 x 3.9 mm

$ 22.28

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1.21ct Orange Hessonite Garnet, Cushion, VS-SI

6 x 6 mm (calibrated)

$ 18.93

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6.81ct Multicolor Coral, Pear Shape, Translucent

19 x 13.5 mm

$ 14.92

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1.26ct Purple Spinel, Cushion, VVS

6.4 x 6.3 mm

$ 68.52

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34.98ct Brown Tiger'S Eye, Oval, Opaque

29.7 x 18.7 mm

$ 19.16

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9.81ctw Brown Smoky Quartz, Flower Cut, Transparent

11.4 x 10.1 mm

$ 41.17

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0.53ct Orange Sphalerite, Round, SI

4.5 mm (calibrated)

$ 26.39

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1.90ct Yellow Citrine, Marquise, VVS-VS

11 x 7 mm

$ 14.57

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14.85ct Green Maw-Sit-Sit, Round, Opaque

14 mm (calibrated)

$ 45.88

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1.20ct Purple Spinel, Cushion, VS

6.4 x 5.5 mm

$ 143.42

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10.95ct Black Star Diopside, Round, Opaque

12 mm (calibrated)

$ 54.53

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56.72ct Multicolor Rhodonite, Pear Shape, Opaque

38.1 x 23.4 mm

$ 56.49

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8.10ctw Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 33.62

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1.36ct Orange Hessonite Garnet, Cushion, VS

7 x 5 mm (calibrated)

$ 24.39

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4.33ctw Red Almandine Garnet, Oval, VS

9 x 7 mm (calibrated)

$ 161.73

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4.37ct Multicolor Agate, Round, Opaque

10 mm (calibrated)

$ 4.35

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0.92ct Yellow Morganite, Oval, VVS

7.9 x 5.7 mm

$ 40.32

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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 have a beautiful emerald I purchased from a company names gemselect and they are awesome! You should try them out?

Posted By Lynn in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

this site is awesome. I was able to look at the products think about purchasing and come back and find the same products. With the amount of inventory gem select has. Its awesome to be able to filter the way that they allow you too.

Posted By Tommyp in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Found a rock that met my need. Bought it!

Posted By Skot in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very good

Posted By Niska in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Wonderful purchase, can't wait to see the stone.

Posted By Tim in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Good selection, using for custom jewlery for my wife.

Posted By Smitty in June, 2025
Source: Bizrate
Enlarged Gemstone Image