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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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Yellow Untreated Gemstones
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3.74ct Pink Strawberry Quartz, Oval, Translucent

3.74ct Pink Strawberry Quartz, Oval, Translucent

12 x 10 mm (calibrated)

$ 44.70

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2.18ct Green Tourmaline, Emerald Cut, VVS-VS

2.18ct Green Tourmaline, Emerald Cut, VVS-VS

17.4 x 4.2 mm

$ 59.71

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21.45ct Multicolor Agate, Oval, Opaque

21.45ct Multicolor Agate, Oval, Opaque

18.7 x 16.8 mm

$ 21.36

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4.81ct Violet Amethyst, Pear Shape, VVS-VS

4.81ct Violet Amethyst, Pear Shape, VVS-VS

15 x 10 mm (calibrated)

$ 36.89

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0.78ctw Yellow Citrine, Oval, VS

0.78ctw Yellow Citrine, Oval, VS

6 x 4 mm (calibrated)

$ 5.13

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1.08ct Blue Kyanite, Oval, VS

1.08ct Blue Kyanite, Oval, VS

7 x 5 mm (calibrated)

$ 26.89

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11.83ct Brown Tiger'S Eye, Baguette, Opaque

11.83ct Brown Tiger'S Eye, Baguette, Opaque

16 x 12 mm (calibrated)

$ 15.32

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2.07ct Red Almandine Garnet, Oval, VVS-VS

2.07ct Red Almandine Garnet, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 77.31

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2.94ct Green Prehnite, Oval, Transparent/Translucent

2.94ct Green Prehnite, Oval, Transparent/Translucent

8.8 x 7.7 mm

$ 8.70

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0.04ct Black Diamond, Round, Opaque

0.04ct Black Diamond, Round, Opaque

2.1 mm (calibrated)

$ 31.87

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6.48ct Brown Star Moonstone, Oval, Translucent

6.48ct Brown Star Moonstone, Oval, Translucent

14.5 x 8.4 mm

$ 28.39

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1.08ct White Sillimanite Cat'S Eye, Oval, Transparent

1.08ct White Sillimanite Cat'S Eye, Oval, Transparent

6.2 x 5.1 mm

$ 3.23

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10.73ctw Multicolor Labradorite, Marquise, Translucent

10.73ctw Multicolor Labradorite, Marquise, Translucent

16 x 8 mm (calibrated)

$ 23.72

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1.07ct Yellow Color-Change Diaspore, Emerald Cut, VS-SI

1.07ct Yellow Color-Change Diaspore, Emerald Cut, VS-SI

8 x 4.4 mm

$ 52.31

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23.14ctw Multicolor Fossil Coral, Oval, Translucent

23.14ctw Multicolor Fossil Coral, Oval, Translucent

19.8 x 12.6 mm

$ 27.48

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29.97ct Multicolor Ruby-Zoisite, Baguette, Opaque
Ruby-Zoisite Product Video (196832)

29.97ct Multicolor Ruby-Zoisite, Baguette, Opaque

28 x 13.2 mm

$ 95.22

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3.61ctw Brown Smoky Quartz, Round, VS

3.61ctw Brown Smoky Quartz, Round, VS

8 mm (calibrated)

$ 7.91

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1.61ct Orange Fire Opal, Oval, Transparent
Fire Opal Product Video (674144)

1.61ct Orange Fire Opal, Oval, Transparent

10.4 x 7.5 mm

$ 56.12

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2.21ct Orange Hessonite Garnet, Cushion, VS-SI

2.21ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 35.81

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54.14ct Blue Turquoise, Oval, Opaque
Turquoise Product Video (725206)

54.14ct Blue Turquoise, Oval, Opaque

28.7 x 23 mm

$ 161.77

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6.52ct Violet Amethyst, Pear Shape, VVS-VS

6.52ct Violet Amethyst, Pear Shape, VVS-VS

16 x 12 mm (calibrated)

$ 50.00

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5.81ct Turquoise Hemimorphite Druzy, Fancy, Opaque

5.81ct Turquoise Hemimorphite Druzy, Fancy, Opaque

14.4 x 10.1 mm

$ 95.48

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8.81ct Brown Moonstone, Oval, Translucent

8.81ct Brown Moonstone, Oval, Translucent

14 x 10.3 mm

$ 19.02

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24.83ct Bi-Color Ametrine, Oval, VS

24.83ct Bi-Color Ametrine, Oval, VS

23.4 x 16.3 mm

$ 173.11

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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

easy site to navigate

Posted By Curt's Cabochons in June, 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

selection was broad and the check out was quick. Great site

Posted By JC Karl in September, 2025
Source: Bizrate

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 -> 9 star ratings

Fast snd easy to find what I was looking for

Posted By Bawb in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I was able to find what I've been looking for.

Posted By Tree Dog in April, 2026
Source: Bizrate
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