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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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5.03ct Multicolor Rainbow Pyrite, Baguette, Opaque

15.4 x 8.6 mm

$ 12.98

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3.20ct Pink Tourmaline, Emerald Cut, VS-SI

10.9 x 6.2 mm

$ 157.77

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3.12ctw Yellow Golden Beryl, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 68.37

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1.24ct Green Tourmaline, Emerald Cut, VVS-VS

15.7 x 3.2 mm

$ 23.69

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19.33ct Violet Amethyst, Emerald Cut, VVS-VS

18.3 x 14.3 mm

$ 134.77

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1.33ctw Green Demantoid Garnet, Oval, VS-SI

4 mm (calibrated)

$ 131.51

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0.85ct Green Tourmaline, Emerald Cut, VVS-VS

13.4 x 3 mm

$ 21.17

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7.78ct Yellow Citrine, Briolette, VVS

14.1 x 9.5 mm

$ 43.91

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28.02ct Multicolor Tiger'S Eye Matrix, Fancy, Opaque

30 x 22 mm (calibrated)

$ 12.84

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7.52ct Violet Amethyst, Pear Shape, Transparent

14.9 x 12.3 mm

$ 44.94

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0.39ct Blue Kyanite, Round, SI

4.3 mm

$ 9.71

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6.85ct Black Tourmaline, Emerald Cut, Opaque

16.6 x 6.9 mm

$ 34.11

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8.55ct Multicolor Boulder Opal, Cushion, Opaque

16 x 13.6 mm

$ 35.48

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0.58ct Green Tourmaline, Emerald Cut, VVS-VS

4.7 x 4.6 mm

$ 28.88

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1.90ctw Orange Hessonite Garnet, Emerald Cut, VS

7 x 5 mm (calibrated)

$ 29.14

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7.06ctw Multicolor Labradorite, Marquise, Translucent

14 x 7 mm (calibrated)

$ 15.60

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4.39ctw Green Tsavorite Garnet, Pear Shape, VS

5 x 3 mm (calibrated)

$ 240.48

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1.25ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7 x 5 mm (calibrated)

$ 3.93

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0.53ct Green Cat'S Eye Alexandrite, Round, Opaque

4.5 mm (calibrated)

$ 109.98

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1.15ct Orange Hessonite Garnet, Pear Shape, VS

8 x 6 mm (calibrated)

$ 22.91

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2.48ctw White Rainbow Moonstone, Oval, Transparent

7.1 x 6.1 mm

$ 81.53

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13.41ct Black Tourmaline, Emerald Cut, Opaque

14.8 x 12.3 mm

$ 66.78

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4.77ct Multicolor Rainbow Pyrite, Pear Shape, Opaque

15 x 10 mm (calibrated)

$ 12.35

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1.89ctw Blue Kyanite, Oval, SI

7 x 5 mm (calibrated)

$ 39.34

View Gem
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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

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

On the clarity options it goes "and better" so if youre looking for si specifically and you click si and better it still shows you basically everything. It just removes the opaques. Itd be nice if it was vs only, vss only, si only, etc

Posted By Iamnotakrustykrab in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I love the ability to choose from many options of shapes, gemstone type, color, and so forth. It is fun!

Posted By Geof in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Enjoy viewing the selections. Excellent product

Posted By ToRa.62 in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very neat and to the point

Posted By Botha in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Great site for finding specific stones and sizes for individual pieces of jewelry

Posted By Designer in December, 2025
Source: Bizrate
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