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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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0.25ct Green Kornerupine, Baguette, VVS

5.5 x 2.8 mm

$ 13.70

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38.68ct Multicolor Feather Pyrite, Oval, Opaque

31.8 x 21.7 mm

$ 30.18

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0.45ctw Blue Kyanite, Round, VS-SI

3.5 mm (calibrated)

$ 8.07

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14.31ct Multicolor Amethyst Geode Slice, Fancy, Transparent

20 x 15 mm (calibrated)

$ 15.25

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5.67ctw Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 45.18

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1.78ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 29.93

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3.31ct Yellow Citrine, Square, VS

9 x 9 mm (calibrated)

$ 18.14

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17.64ct Violet Amethyst, Oval, VVS

21.4 x 11.3 mm

$ 135.29

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1.70ctw Green Tsavorite Garnet, Round, VVS-VS

2.6 mm (calibrated)

$ 142.53

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8.89ct Multicolor Ruby-Zoisite, Oval, Opaque

14 x 10 mm (calibrated)

$ 21.60

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2.96ct Brown Smoky Quartz, Marquise, VVS

18 x 7.1 mm

$ 17.69

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1.00ct Brown Color-Change Garnet, Cushion, VS

5.9 x 5 mm

$ 79.89

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5.55ct Multicolor Fire Agate, Fancy, Opaque

13.4 x 9.9 mm

$ 41.72

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5.63ct Brown Smoky Quartz, Marquise, Transparent

22 x 8.9 mm

$ 6.17

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1.94ct White Rainbow Moonstone, Oval, Transparent

9 x 7 mm (calibrated)

$ 33.02

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3.23ctw Yellow Sillimanite, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 123.86

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44.94ct Yellow Calcite, Pear Shape, Translucent

40 x 25.3 mm

$ 30.88

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21.12ct Green Jadeite, Oval, Opaque

23.8 x 17.4 mm

$ 69.42

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1.76ctw Yellow Sphene, Oval, Transparent

6 x 5.3 mm

$ 8.76

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1.44ct Orange Hessonite Garnet, Square, VS

6 x 6 mm (calibrated)

$ 24.16

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3.67ct Yellow Citrine, Oval, VVS-VS

11 x 9 mm (calibrated)

$ 25.59

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0.21ct Blue Iolite, Emerald Cut, VVS-VS

5 x 3 mm (calibrated)

$ 8.37

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0.59ct Orange Fire Opal, Oval, Transparent

8 x 6 mm (calibrated)

$ 11.64

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8.33ct Multicolor Boulder Opal, Fancy, Opaque

17.9 x 11.7 mm

$ 34.57

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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've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025
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Overall Rating -> 10 star ratings

Easy and functional

Posted By Dessa in March, 2026
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Overall Rating -> 10 star ratings

good navigation and simple interface.

Posted By Dave in April, 2026
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Overall Rating -> 10 star ratings

the selection is good as are the prices

Posted By Old man in August, 2025
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Overall Rating -> 10 star ratings

It was good. There was a large selection at prices I could afford.

Posted By Zorah in February, 2026
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Overall Rating -> 10 star ratings

It was all good

Posted By Debsarabs in February, 2026
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