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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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25.40ctw Multicolor Jasper, Cushion, Opaque

23.1 x 13.1 mm

$ 14.43

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2.67ctw Yellow Golden Beryl, Oval, VS

9 x 7 mm (calibrated)

$ 58.51

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0.56ct Pink Spinel, Cushion, VS

5.5 x 3.9 mm

$ 39.04

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1.87ct Orange Hessonite Garnet, Round, VS-SI

7 mm (calibrated)

$ 34.83

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0.68ct Green Peridot, Marquise, VVS-VS

8 x 4 mm (calibrated)

$ 10.84

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1.95ct Violet Amethyst, Pear Shape, VVS-VS

10 x 7 mm (calibrated)

$ 12.82

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4.73ct Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 23.56

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5.27ct Violet Amethyst, Pear Shape, Transparent

14.3 x 11.1 mm

$ 31.49

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14.41ct Red Star Garnet, Round, Opaque

13 mm (calibrated)

$ 14.21

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4.15ct Yellow Citrine, Oval, VVS-VS

11.8 x 9.5 mm

$ 25.15

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2.39ctw Green Prehnite, Oval, Transparent

7.8 x 5.7 mm

$ 13.10

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3.76ctw Multicolor Andalusite, Round, VS

3.1 mm

$ 165.32

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0.92ct Orange Sphalerite, Round, SI-I1

6 mm (calibrated)

$ 45.82

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5.40ctw Yellow Citrine, Oval, VVS

10 x 8 mm (calibrated)

$ 29.58

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8.76ctw Violet Amethyst, Oval, Transparent

11 x 9 mm (calibrated)

$ 34.64

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0.55ct Green Peridot, Marquise, VS

8 x 4 mm (calibrated)

$ 8.22

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0.33ct Violet Iolite, Baguette, VS

5 x 3 mm (calibrated)

$ 13.15

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0.85ct Blue Kyanite, Round, SI

6 mm (calibrated)

$ 21.17

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21.88ct Brown Star Sunstone, Oval, Opaque

16.6 x 14.7 mm

$ 181.60

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14.52ct Multicolor Fossil Coral, Cushion, Opaque

23.4 x 12.6 mm

$ 25.94

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1.51ctw Red Pyrope Garnet, Square, VS

5 x 5 mm (calibrated)

$ 11.59

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4.83ct White Topaz, Round, VVS-VS

10 mm (calibrated)

$ 18.59

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1.60ct Yellow Citrine, Pear Shape, VVS-VS

10 x 7 mm (calibrated)

$ 12.27

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1.72ctw Yellow Citrine, Square, VVS-VS

5.9 x 5.7 mm

$ 11.99

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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

Over pretty well experience the your website no complaints about it very easy reliable service provided

Posted By Blas 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 -> 9 star ratings

I did not realize these stones were of jewelry quality. They are really beautiful, just not what I was expecting which was more of a natural stone.

Posted By Jewelry Quality Stones in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Would have bought an indigo and selenite, but neither listed. But, you do offer quite a large assortment otherwise.

Posted By JD in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

It was good. There was a large selection at prices I could afford.

Posted By Zorah in February, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Very good and simple exchange

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