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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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1.48ct Blue Cavansite, Fancy, Opaque

1.48ct Blue Cavansite, Fancy, Opaque

8.5 x 7.6 mm

$ 8.60

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0.95ctw White Rainbow Moonstone, Oval, Transparent

0.95ctw White Rainbow Moonstone, Oval, Transparent

6 x 4 mm (calibrated)

$ 31.23

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4.67ctw Green Peridot, Round, VS

4.67ctw Green Peridot, Round, VS

6 mm (calibrated)

$ 45.65

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3.03ct Violet Amethyst, Trillion, VVS

3.03ct Violet Amethyst, Trillion, VVS

10 x 10 mm (calibrated)

$ 21.12

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27.67ct Yellow Obsidian, Pear Shape, Opaque

27.67ct Yellow Obsidian, Pear Shape, Opaque

28.4 x 20.8 mm

$ 24.25

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10.55ct Bi-Color Ametrine, Briolette, VVS

10.55ct Bi-Color Ametrine, Briolette, VVS

18.5 x 10.1 mm

$ 67.43

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10.91ctw Multicolor Pietersite, Oval, Opaque

10.91ctw Multicolor Pietersite, Oval, Opaque

20.9 x 11.2 mm

$ 25.54

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2.15ct Yellow Citrine, Flower Cut, Transparent

2.15ct Yellow Citrine, Flower Cut, Transparent

8 x 8 mm (calibrated)

$ 16.49

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26.75ct Violet Amethyst, Round, VVS

26.75ct Violet Amethyst, Round, VVS

20 mm (calibrated)

$ 186.50

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6.32ct Yellow Citrine, Oval, VVS-VS

6.32ct Yellow Citrine, Oval, VVS-VS

14 x 10 mm (calibrated)

$ 37.94

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2.68ct Orange Hessonite Garnet, Cushion, VS

2.68ct Orange Hessonite Garnet, Cushion, VS

9 x 7 mm (calibrated)

$ 48.05

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3.53ctw Brown Smoky Quartz, Round, VS

3.53ctw Brown Smoky Quartz, Round, VS

8 mm (calibrated)

$ 7.74

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3.46ct Violet Amethyst, Pear Shape, VVS-VS

3.46ct Violet Amethyst, Pear Shape, VVS-VS

14 x 10 mm (calibrated)

$ 25.13

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5.00ctw Yellow Citrine, Square, VVS-VS

5.00ctw Yellow Citrine, Square, VVS-VS

8 x 8 mm (calibrated)

$ 38.35

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9.25ct Brown Star Moonstone, Oval, Translucent

9.25ct Brown Star Moonstone, Oval, Translucent

16.4 x 10.7 mm

$ 40.54

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3.72ctw Orange Hessonite Garnet, Square, VS-SI

3.72ctw Orange Hessonite Garnet, Square, VS-SI

7 x 7 mm (calibrated)

$ 81.51

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0.14ctw White Diamond, Round, VVS-VS

0.14ctw White Diamond, Round, VVS-VS

2.6 mm (calibrated)

$ 254.36

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8.17ctw Yellow Citrine, Oval, VVS-VS

8.17ctw Yellow Citrine, Oval, VVS-VS

12 x 10 mm (calibrated)

$ 65.10

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4.09ctw Orange Moonstone, Cushion, Translucent

4.09ctw Orange Moonstone, Cushion, Translucent

8 x 8 mm (calibrated)

$ 8.15

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0.06ct White Diamond, Marquise, VVS
Diamond Product Video (740688)

0.06ct White Diamond, Marquise, VVS

4 x 2 mm (calibrated)

$ 208.54

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4.08ct Multicolor Fire Agate, Fancy, Opaque

4.08ct Multicolor Fire Agate, Fancy, Opaque

11 x 9 mm (calibrated)

$ 31.37

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0.89ct Orange Morganite, Pear Shape, VS

0.89ct Orange Morganite, Pear Shape, VS

8 x 6 mm (calibrated)

$ 53.63

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18.15ct White Rainbow Moonstone, Oval, Translucent

18.15ct White Rainbow Moonstone, Oval, Translucent

23.7 x 13.2 mm

$ 15.06

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2.65ctw Green Peridot, Round, VVS-VS

2.65ctw Green Peridot, Round, VVS-VS

4.5 mm (calibrated)

$ 43.56

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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

GemSelect is always my first choice for purchasing gemstones. The fact that the gems are always exactly as described and pictured on the website has earned my trust many times over. Even when I don't buy, I still love browsing all the beautiful stones. My new favorites are the bright green Tsavorites!

Posted By Lkcisneros in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

No problems. I had a minor address issue in the past and someone got back to me very quickly and we resolved the issue satisfactorily. I appreciated the quick, concerned response. So important when buyer/seller are so far apart in distance. Thank you Gem Select. Keep up the good work!

Posted By Orphanboy in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

hassle free experience.

Posted By Jhidron in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

good navigation and simple interface.

Posted By Dave in April, 2026
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

love the site, the experience and the products.

Posted By Ckingpots in July, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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