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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
Untreated Gemstones Size
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Yellow Untreated Gemstones
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2.19ct Purple Rhodolite Garnet, Oval, VVS

8.2 x 7 mm

$ 58.71

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27.43ct Red Strawberry Quartz, Fancy, Opaque

30.7 x 10.8 mm

$ 2.73

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5.74ctw Brown Tiger'S Eye, Oval, Opaque

10 x 8 mm (calibrated)

$ 8.57

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0.72ct Yellow Color-Change Diaspore, Cushion, VVS-VS

5.8 x 4.7 mm

$ 38.01

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0.29ct Violet Iolite, Emerald Cut, VS-SI

5 x 3 mm (calibrated)

$ 11.55

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0.40ct Blue Kyanite, Round, SI

4.2 mm

$ 9.96

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2.36ct Orange Hessonite Garnet, Oval, VS-SI

9 x 7.4 mm

$ 42.31

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7.19ct Brown Tiger'S Eye, Baguette, Opaque

14.2 x 10.4 mm

$ 7.16

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26.25ctw Multicolor Labradorite, Round, Translucent

20 mm (calibrated)

$ 57.52

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5.20ctw Bi-Color Tourmaline, Fancy, Transparent

10.7 x 10.5 mm

$ 129.48

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3.89ct Multicolor Opal, Oval, Transparent

14.5 x 10.8 mm

$ 81.49

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12.50ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

15.9 x 12.5 mm

$ 5.73

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7.19ct Yellow Apatite, Oval, VS

14 x 12 mm (calibrated)

$ 236.32

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25.54ctw Brown Tiger'S Eye, Fancy, Opaque

16 x 16 mm (calibrated)

$ 27.98

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0.24ct Violet Iolite, Emerald Cut, VS-SI

5 x 3 mm (calibrated)

$ 9.56

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1.12ct Blue Kyanite, Oval, VS-SI

7 x 5 mm (calibrated)

$ 23.31

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1.22ct Yellow Color-Change Diaspore, Cushion, VS

7.7 x 5.2 mm

$ 49.77

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2.49ct Brown Rutile Quartz, Pear Shape, Transparent

10 x 7 mm (calibrated)

$ 6.81

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100.51ct Violet Amethyst, Oval, IF

35.5 x 26.7 mm

$ 585.63

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15.55ctw Blue Chalcedony, Round, Transparent

13 mm (calibrated)

$ 17.04

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0.87ctw White Rainbow Moonstone, Oval, Transparent

6 x 4 mm (calibrated)

$ 28.60

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19.32ctw Yellow Rutile Quartz, Sphere / Ball, Transparent

11 mm (calibrated)

$ 21.17

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7.35ctw White Topaz, Square, VVS-VS

5 x 5 mm (calibrated)

$ 58.86

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3.60ct Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 17.93

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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

Everything was great, website user friendly, quality amazing, communication amazing, delivery amazing, everything was as expected, they done what they said they would, overall experience was amazing.

Posted By Jac in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.

Posted By Atsuhisa in January, 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

The stones are very nice.

Posted By Mvk in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection of gems at a reasonable price

Posted By Curt in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

All items were delivered on time with all items meeting or exceeding my expectations. Cut, clarity and color were very close to the photos and description.

Posted By Bob D in December, 2025
Source: Bizrate
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