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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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1.42ct Orange Hessonite Garnet, Emerald Cut, VS-SI

6.4 x 6.2 mm

$ 28.00

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3.30ctw Orange Hessonite Garnet, Cushion, VS

6 x 6 mm (calibrated)

$ 55.03

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9.58ct White Rose Quartz, Flower Cut, Transparent

16 x 16 mm (calibrated)

$ 21.00

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1.19ct White Sillimanite Cat'S Eye, Oval, Transparent

6.9 x 4.7 mm

$ 3.72

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6.91ct Violet Amethyst, Cushion, VVS

18 x 9.1 mm

$ 41.29

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7.43ctw Yellow Citrine, Pear Shape, VVS-VS

12 x 10 mm (calibrated)

$ 48.85

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0.85ctw Yellow Citrine, Oval, VVS-VS

5.9 x 4.2 mm

$ 6.52

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1.23ctw Green Demantoid Garnet, Oval, VS

4.5 x 3.6 mm

$ 134.76

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2.36ct Orange Moonstone, Cushion, Translucent

8 x 8 mm (calibrated)

$ 4.70

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0.15ctw White Diamond, Round, VVS-VS

2.8 mm (calibrated)

$ 268.16

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0.69ct White Rainbow Moonstone, Oval, Transparent

7 x 5 mm (calibrated)

$ 11.69

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30.06ct Multicolor Tiger'S Eye Matrix, Pear Shape, Opaque

26.7 x 18.2 mm

$ 17.06

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0.79ct Pink Morganite, Oval, VS

6.8 x 4.8 mm

$ 47.61

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8.87ct Multicolor Agate, Oval, Opaque

11.7 x 11.2 mm

$ 15.02

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21.22ctw Black Spinel, Oval, Opaque

16 x 12 mm (calibrated)

$ 69.75

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16.92ct Multicolor Agate, Oval, Opaque

15.5 x 14.5 mm

$ 16.85

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3.56ctw Red Pyrope Garnet, Pear Shape, VVS-VS

7.1 x 5.2 mm

$ 27.30

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3.48ctw Orange Sunstone, Oval, Translucent

7 x 5 mm (calibrated)

$ 19.94

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0.94ct Yellow Color-Change Diaspore, Cushion, VS

6.7 x 5.1 mm

$ 33.00

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19.44ct Multicolor Jasper, Oval, Opaque

23.9 x 14.5 mm

$ 12.18

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10.77ct Green Druzy Variscite, Fancy, Opaque

22.4 x 18.1 mm

$ 11.05

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1.32ct Green Sphene, Oval, Transparent

6.8 x 5.9 mm

$ 6.57

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0.57ct Yellow Spessartite Garnet, Oval, VS

5.1 x 4.2 mm

$ 17.03

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4.38ct Green Jade, Oval, Opaque

11.9 x 9.4 mm

$ 8.72

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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

The website was very easy to use.

Posted By Garnet in January, 2026
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 -> 9 star ratings

Nothing bad to report. Everything is as expected. The gems and the price are all very good.

Posted By Dafanatic in August, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly

Posted By Ron T in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Filters need to be improved but rest of website is great

Posted By Rock hound in December, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Ita's a pretty good and simple way to find gems that youa're looking for amazing selection

Posted By Amman in May, 2026
Source: Bizrate
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