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Home Gemstones Untreated Gemstones

Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
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0.50ct Purple Spinel, Cushion, VS

5.3 x 3.8 mm

$ 34.86

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26.34ct Green Amazonite, Fancy, Opaque

38 x 9.5 mm

$ 5.25

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0.76ct Multicolor Opal, Pear Shape, Transparent

9 x 6 mm (calibrated)

$ 18.92

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

5.6 x 4.9 mm

$ 32.83

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11.59ct Violet Amethyst, Pear Shape, Transparent

18 x 13 mm (calibrated)

$ 69.26

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1.24ct Gray Sillimanite Cat'S Eye, Oval, Translucent

7.5 x 5.4 mm

$ 3.92

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21.02ct Brown Tiger'S Eye, Oval, Opaque

24.8 x 16.6 mm

$ 46.06

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1.03ct Yellow Color-Change Diaspore, Cushion, VVS

6.3 x 5.1 mm

$ 42.55

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11.36ct Green Druzy Variscite, Fancy, Opaque

22.4 x 19.6 mm

$ 11.65

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2.53ctw Yellow Citrine, Oval, VS

9 x 7 mm (calibrated)

$ 13.86

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1.95ct Multicolor Labradorite, Baguette, Transparent

8 x 6 mm (calibrated)

$ 4.27

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1.64ct Yellow Citrine, Round, VVS-VS

8 mm (calibrated)

$ 13.06

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3.03ct Multicolor Pietersite, Marquise, Opaque

17.6 x 6 mm

$ 7.15

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25.62ctw Multicolor Fossil Coral, Cushion, Opaque

17.8 x 12.4 mm

$ 33.12

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1.10ct Orange Morganite, Oval, VS

8 x 6 mm (calibrated)

$ 66.28

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1.87ct Multicolor Labradorite, Pear Shape, Translucent

9 x 6 mm (calibrated)

$ 4.13

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2.82ct Orange Hessonite Garnet, Oval, VS-SI

9 x 7.8 mm

$ 40.05

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4.49ct Green Fluorite, Oval, Transparent

10.9 x 8.4 mm

$ 18.47

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10.21ct Violet Amethyst, Oval, Transparent

15 x 15 mm (calibrated)

$ 50.85

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4.37ct Purple Kunzite, Cushion, VVS-VS

9.4 x 9.4 mm

$ 120.26

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13.59ct Multicolor Boulder Opal, Oval, Opaque

20 x 15 mm (calibrated)

$ 67.68

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11.18ct Multicolor Boulder Opal, Pear Shape, Opaque

23.3 x 16.3 mm

$ 61.25

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2.87ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 22.84

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0.46ct Orange Citrine, Marquise, VS

8 x 4 mm (calibrated)

$ 3.20

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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 love the product and the details about each of them.

Posted By Love It! in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Good, hope gem quality is good and genuine

Posted By Varun in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I always purchase my stones from GemSelect, their products are high quality and customer service is always great. I also like the fact that I am able to purchase unique items

Posted By Desperaux in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was able to find what I wanted very easily!

Posted By Lenny in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

It was all good

Posted By Debsarabs in February, 2026
Source: Bizrate
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