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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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0.86ct Yellow Color-Change Diaspore, Cushion, VS

0.86ct Yellow Color-Change Diaspore, Cushion, VS

5.7 x 4.9 mm

$ 32.98

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3.21ct Yellow Citrine, Oval, VVS

3.21ct Yellow Citrine, Oval, VVS

11.9 x 8.8 mm

$ 19.46

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0.78ct Green Peridot, Emerald Cut, VS-SI

0.78ct Green Peridot, Emerald Cut, VS-SI

7 x 5 mm (calibrated)

$ 11.65

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0.91ct Yellow Color-Change Diaspore, Emerald Cut, VS

0.91ct Yellow Color-Change Diaspore, Emerald Cut, VS

7.1 x 4 mm

$ 44.87

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1.06ct Green Tourmaline, Emerald Cut, VVS-VS
Tourmaline Product Video (730488)

1.06ct Green Tourmaline, Emerald Cut, VVS-VS

7.4 x 4.3 mm

$ 52.79

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0.25ct Yellow Sphalerite, Round, SI-I1

0.25ct Yellow Sphalerite, Round, SI-I1

3.5 mm (calibrated)

$ 12.45

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16.62ct Multicolor Jasper, Fancy, Opaque

16.62ct Multicolor Jasper, Fancy, Opaque

28 x 8.6 mm

$ 10.01

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0.71ct Pink Spinel, Heart, VVS-VS

0.71ct Pink Spinel, Heart, VVS-VS

6 x 5.5 mm

$ 85.20

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0.40ct Orange Sphalerite, Oval, VS-SI

0.40ct Orange Sphalerite, Oval, VS-SI

4.6 x 3.8 mm

$ 19.92

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2.84ct Yellow Beryl, Oval, VVS-VS

2.84ct Yellow Beryl, Oval, VVS-VS

11 x 9 mm (calibrated)

$ 62.23

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0.32ct Pink Morganite, Oval, VS

0.32ct Pink Morganite, Oval, VS

5.3 x 3.9 mm

$ 14.34

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1.01ct Blue Kyanite, Oval, VS-SI

1.01ct Blue Kyanite, Oval, VS-SI

7 x 5 mm (calibrated)

$ 22.13

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3.90ctw Purple Rhodolite Garnet, Oval, VVS-VS

3.90ctw Purple Rhodolite Garnet, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 82.93

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13.61ct Brown Smoky Quartz, Oval, VVS

13.61ct Brown Smoky Quartz, Oval, VVS

20 x 15 mm (calibrated)

$ 18.64

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14.80ct Multicolor Agate, Round, Opaque

14.80ct Multicolor Agate, Round, Opaque

15 mm (calibrated)

$ 25.06

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14.15ctw Green Amazonite, Marquise, Opaque

14.15ctw Green Amazonite, Marquise, Opaque

18.2 x 9.3 mm

$ 11.27

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0.63ct Orange Fire Opal, Oval, Transparent

0.63ct Orange Fire Opal, Oval, Transparent

8 x 6 mm (calibrated)

$ 17.94

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21.50ctw Green Prehnite, Flower Cut, Transparent

21.50ctw Green Prehnite, Flower Cut, Transparent

15.2 x 10.5 mm

$ 32.51

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8.49ct Multicolor Agate, Oval, Translucent

8.49ct Multicolor Agate, Oval, Translucent

14 x 12 mm (calibrated)

$ 16.92

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6.54ct Brown Tiger'S Eye, Baguette, Opaque

6.54ct Brown Tiger'S Eye, Baguette, Opaque

12 x 10 mm (calibrated)

$ 6.52

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1.62ct Orange Zircon, Emerald Cut, VS
Zircon Product Video (430496)

1.62ct Orange Zircon, Emerald Cut, VS

7 x 5 mm (calibrated)

$ 44.37

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0.78ct Pink Morganite, Pear Shape, VS

0.78ct Pink Morganite, Pear Shape, VS

8 x 5.2 mm

$ 68.37

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1.42ct Yellow Beryl, Cushion, VS

1.42ct Yellow Beryl, Cushion, VS

8 x 6 mm (calibrated)

$ 31.12

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3.70ct Pink Strawberry Quartz, Oval, Transparent

3.70ct Pink Strawberry Quartz, Oval, Transparent

11 x 9 mm (calibrated)

$ 27.75

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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 needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Navigating the site was very easy and the photos of the exact gem you would be purchasing was well done.

Posted By HVeeder in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Always get a nice gemstone. Just like the picture. Never disappointed

Posted By Ron T in June, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I am filling a small treasure chest and picked a nice amethyst.

Posted By VinnyD in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Easy and good price

Posted By Bry_guy in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Easy picking, fast checkout, secure shipping. Cana't ask for anything more than efficiency and a good price.

Posted By Beman in September, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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