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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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15.06ct Black Tourmaline, Cushion, Opaque

16.1 x 14.2 mm

$ 75.00

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0.45ct White Rainbow Moonstone, Baguette, Transparent

5.8 x 3.9 mm

$ 15.69

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3.85ct Multicolor Dendritic Agate, Oval, Transparent

16.3 x 10.8 mm

$ 13.68

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4.54ct Yellow Citrine, Emerald Cut, VS

11 x 9 mm (calibrated)

$ 30.44

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10.02ct Multicolor Boulder Opal, Oval, Opaque

20.8 x 14.2 mm

$ 49.90

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2.86ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 22.79

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3.27ctw Yellow Citrine, Emerald Cut, VVS-VS

8 x 6 mm (calibrated)

$ 25.08

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19.39ct Pink Rose Quartz, Oval, Transparent/Translucent

18.9 x 13.3 mm

$ 28.68

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4.78ct Pink Strawberry Quartz, Oval, Translucent

14 x 10 mm (calibrated)

$ 28.80

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2.69ctw Purple Rhodolite Garnet, Round, VS

5 mm (calibrated)

$ 58.95

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1.20ct Yellow Color-Change Diaspore, Emerald Cut, VVS

9.7 x 3.8 mm

$ 63.35

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11.91ct Multicolor Coral, Round, Translucent

18 mm (calibrated)

$ 26.10

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1.12ct Red Fire Opal, Oval, Transparent

9 x 7 mm (calibrated)

$ 40.97

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2.94ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 23.42

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1.46ct Multicolor Opal, Oval, Transparent

10 x 7 mm (calibrated)

$ 36.35

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27.92ctw Multicolor Fossil Coral, Pear Shape, Opaque

22 x 14 mm

$ 30.59

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1.85ctw Purple Rhodolite Garnet, Oval, VS

5.4 x 3.5 mm

$ 30.10

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3.09ct Turquoise Grandidierite, Oval, Translucent

9.6 x 7.4 mm

$ 169.27

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2.93ctw Orange Mali Garnet, Oval, VVS-VS

6 x 4.9 mm

$ 171.58

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2.31ctw Yellow Citrine, Pear Shape, VVS-VS

8 x 5 mm (calibrated)

$ 14.61

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3.38ctw Red Pyrope Garnet, Emerald Cut, VS

5.8 x 3.8 mm

$ 23.56

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1.56ct Red Almandine Garnet, Baguette, VVS

9.8 x 4.9 mm

$ 12.95

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1.07ct Yellow Morganite, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 64.48

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2.62ctw Purple Rhodolite Garnet, Trillion, VS

5 x 5 mm (calibrated)

$ 22.97

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 -> 10 star ratings

Gem Select has a user friendly website and the product is very good as is the price. The gems are described accurately and I always get what I think I'm getting.

Posted By Happy Customer in June, 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 -> 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

Overall Rating -> 10 star ratings

overall great

Posted By SR in April, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Plan on purchasing on an ongoing basis. So far.....so good....

Posted By Jim in January, 2026
Source: Bizrate
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