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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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1.63ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7.6 x 5.6 mm

$ 5.36

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3.95ct Yellow Citrine, Oval, VVS

12 x 10 mm (calibrated)

$ 30.30

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3.92ctw Red Pyrope Garnet, Marquise, VVS-VS

12 x 6.2 mm

$ 38.79

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15.17ct Brown Smoky Quartz, Round, VVS-VS

17 mm (calibrated)

$ 49.86

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27.82ct Violet Charoite, Fancy, Opaque

29.7 x 18.1 mm

$ 46.00

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11.91ct Brown Smoky Quartz, Round, VVS-VS

17 mm (calibrated)

$ 14.48

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6.70ctw White Moonstone, Round, Translucent

9 mm (calibrated)

$ 16.68

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0.20ct Violet Iolite, Square, VVS

3.3 x 3.2 mm

$ 7.97

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1.43ctw Red Pyrope Garnet, Square, VS

5 x 5 mm (calibrated)

$ 10.96

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1.45ct Multicolor Opal, Oval, Transparent

10 x 8 mm (calibrated)

$ 36.11

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3.39ct Yellow Prehnite, Oval, Transparent/Translucent

10 x 7 mm (calibrated)

$ 31.79

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0.32ct Black Diamond, Square, Opaque

3.3 x 3.1 mm

$ 132.80

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1.51ct Purple Spinel, Cushion, VVS-VS

6.8 x 6.5 mm

$ 103.24

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10.20ct White Jadeite, Oval, Translucent

20 x 15 mm (calibrated)

$ 33.52

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61.81ct Violet Amethyst, Pear Shape, VVS

33.7 x 22.4 mm

$ 513.02

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3.03ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 23.24

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0.71ct Yellow Citrine, Marquise, VS

9.2 x 5.1 mm

$ 5.66

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4.57ct Violet Amethyst, Marquise, VVS-VS

16.7 x 8.5 mm

$ 35.05

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36.83ct Multicolor Jasper, Oval, Opaque

34.8 x 25.7 mm

$ 30.26

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6.11ct Yellow Citrine, Briolette, VVS-VS

14.8 x 8.5 mm

$ 34.20

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1.64ct Violet Amethyst, Marquise, VS

12.1 x 6.1 mm

$ 12.58

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1.36ct Brown Color-Change Garnet, Oval, VS

6.6 x 5.5 mm

$ 108.66

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15.10ct Violet Amethyst, Oval, VVS-VS

22.1 x 14.5 mm

$ 105.28

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3.67ctw Yellow Citrine, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 28.15

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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
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Overall Rating -> 9 star ratings

Will know more once order received

Posted By Jim in September, 2025
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Overall Rating -> 10 star ratings

I feel Gemselect is a trustworthy company to buy from

Posted By Becky in October, 2025
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Overall Rating -> 10 star ratings

selection was broad and the check out was quick. Great site

Posted By JC Karl in September, 2025
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Overall Rating -> 10 star ratings

Great site for finding specific stones and sizes for individual pieces of jewelry

Posted By Designer in December, 2025
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Overall Rating -> 10 star ratings

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026
Source: Bizrate
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