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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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6.76ct Turquoise Larimar, Oval, Opaque

14 x 10 mm (calibrated)

$ 87.44

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4.94ct Yellow Apatite, Baguette, VS

12.5 x 7.4 mm

$ 254.38

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7.50ct Multicolor Fire Agate, Fancy, Translucent

13.8 x 11.1 mm

$ 105.68

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30.59ctw Multicolor Coral, Cushion, Opaque

18 x 13 mm (calibrated)

$ 57.98

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31.21ct Multicolor Peanut Wood, Cushion, Opaque

37.2 x 17 mm

$ 18.66

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3.64ct Yellow Prehnite, Oval, Transparent/Translucent

10 x 8 mm (calibrated)

$ 28.45

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28.16ct Multicolor Pietersite, Pear Shape, Opaque

29 x 19.5 mm

$ 102.84

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9.00ct Yellow Apatite, Oval, VS

16.4 x 11.1 mm

$ 408.91

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8.27ct Orange Spessartite Garnet, Pear Shape, Transparent

12 x 12 mm (calibrated)

$ 221.29

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9.99ct Pink Kunzite, Pear Shape, VS

17.5 x 9.6 mm

$ 273.63

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9.06ct Green Prehnite, Round, Translucent

14 mm (calibrated)

$ 44.67

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4.39ctw Pink Strawberry Quartz, Round, Translucent

8.5 mm (calibrated)

$ 67.34

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7.78ct Turquoise Grandidierite, Cushion, VS-SI

15.2 x 10.7 mm

$ 1,704.75

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0.25ct Yellow Diamond, Round, VS-SI

4 mm (calibrated)

$ 380.34

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55.03ct Pink Rose Quartz, Trillion, Transparent

29.2 x 24.5 mm

$ 98.89

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55.96ct Multicolor Jasper, Oval, Opaque

43.2 x 22.6 mm

$ 61.31

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12.27ct Green Maw-Sit-Sit, Pear Shape, Opaque

16 x 12 mm (calibrated)

$ 26.88

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11.59ct Brown Smoky Quartz, Emerald Cut, VVS

15 x 15 mm (calibrated)

$ 46.73

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1.95ctw Brown Sillimanite Cat'S Eye, Oval, Transparent

7.1 x 5.3 mm

$ 6.42

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21.16ct Multicolor Boulder Opal, Fancy, Opaque

25.6 x 16.9 mm

$ 105.38

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0.87ct Multicolor Opal, Round, Transparent

7 mm (calibrated)

$ 18.02

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13.86ct Yellow Rutile Quartz, Pear Shape, Transparent

21.7 x 15.2 mm

$ 48.75

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0.31ct Green Kornerupine, Oval, VS-SI

4.7 x 3.7 mm

$ 26.55

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57.02ct Multicolor Amethyst Geode Slice, Fancy, Transparent

34.5 x 27.6 mm

$ 60.76

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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

Plan on purchasing on an ongoing basis. So far.....so good....

Posted By Jim in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

overall great

Posted By SR in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Enjoy every moment

Posted By Ferns in October, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

It was fine . Wish there had been more round stones to select from

Posted By Emm in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Easy and functional

Posted By Dessa in March, 2026
Source: Bizrate
Enlarged Gemstone Image