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Untreated Gemstones

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

Untreated Gemstones Weight
Untreated Gemstones Size
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Untreated Gemstones Treatment

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Multicolor Untreated Gemstones
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Yellow Untreated Gemstones
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3.97ct Orange Sunstone, Round, Translucent

10 mm (calibrated)

$ 19.28

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1.19ct Orange Zircon, Round, VVS-VS

6 mm (calibrated)

$ 26.08

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1.18ctw Blue Kyanite, Round, VS-SI

4.3 mm

$ 29.38

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3.37ctw Brown Smoky Quartz, Round, VVS-VS

8 mm (calibrated)

$ 9.23

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2.48ct Purple Rhodolite Garnet, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 66.48

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1.40ct Yellow Color-Change Diaspore, Emerald Cut, VS

15.3 x 4.1 mm

$ 73.90

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5.91ct Multicolor Agate, Round, Opaque

10 mm (calibrated)

$ 4.71

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5.77ctw Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 40.23

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39.22ct Violet Amethyst, Oval, VVS-VS

24.3 x 20.4 mm

$ 273.44

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1.19ct Green Sphene, Oval, Transparent

6.7 x 5.6 mm

$ 5.93

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1.64ct Orange Hessonite Garnet, Round, SI

7 mm (calibrated)

$ 30.54

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0.97ct Green Sphene, Round, Transparent

5.7 mm

$ 4.83

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4.14ct Brown Moonstone, Flower Cut, Translucent

12 x 12 mm (calibrated)

$ 18.14

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9.92ct Multicolor Boulder Opal, Fancy, Opaque

17.4 x 15.5 mm

$ 49.40

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2.71ctw Red Pyrope Garnet, Square, VS

5 x 5 mm (calibrated)

$ 20.78

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1.04ct Violet Amethyst, Marquise, VVS

10 x 5 mm (calibrated)

$ 6.91

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2.68ctw White Rainbow Moonstone, Pear Shape, Transparent

5 x 5 mm (calibrated)

$ 53.39

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1.03ct Purple Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 27.36

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3.51ct Blue Kyanite, Oval, SI

11.4 x 8.1 mm

$ 87.40

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5.64ct Pink Strawberry Quartz, Oval, Translucent

13 x 11 mm (calibrated)

$ 33.98

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0.93ct Red Spinel, Pear Shape, VS-SI

8.6 x 5.6 mm

$ 192.98

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2.19ct Green Fluorite, Oval, Transparent

8.3 x 7.1 mm

$ 8.72

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3.91ctw Multicolor Spectrolite, Oval, Opaque

10 x 8 mm (calibrated)

$ 17.88

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1.70ct Pink Strawberry Quartz, Round, Translucent

8 mm (calibrated)

$ 13.04

View Gem
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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 purchased from you before and I have never been disappointed. I always received what I expected and your products are very nice.

Posted By MVK in July, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Fast and reliable service.

Posted By Zæck in December, 2025
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 -> 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

Excellent options

Posted By CJ in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

IT WAS GREAT SIMPLE I WAS ABLE TO MAKE AN ACCOUNT EASY AND WAS ABLE TO FAVORITE ALL OF MY FINAL SELECTED GEMS, I JUST LOVE IT.

Posted By YE in October, 2025
Source: Bizrate
Enlarged Gemstone Image