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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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16.31ct Green Prehnite, Fancy, Translucent

16.31ct Green Prehnite, Fancy, Translucent

18.8 x 14.9 mm

$ 28.24

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0.75ct Pink Morganite, Oval, VVS-VS

0.75ct Pink Morganite, Oval, VVS-VS

7.1 x 5.2 mm

$ 31.13

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7.19ct Brown Tiger'S Eye, Baguette, Opaque

7.19ct Brown Tiger'S Eye, Baguette, Opaque

14.2 x 10.4 mm

$ 7.16

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1.35ct Purple Spinel, Oval, VS

1.35ct Purple Spinel, Oval, VS

8.5 x 5.4 mm

$ 224.93

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0.48ct Violet Amethyst, Emerald Cut, VS

0.48ct Violet Amethyst, Emerald Cut, VS

6 x 4 mm (calibrated)

$ 2.79

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8.33ctw Pink Moonstone, Flower Cut, Translucent

8.33ctw Pink Moonstone, Flower Cut, Translucent

9 x 9 mm (calibrated)

$ 36.50

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33.46ctw Multicolor Moss Agate, Fancy, Transparent

33.46ctw Multicolor Moss Agate, Fancy, Transparent

30.2 x 14.8 mm

$ 33.32

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2.24ctw White Rainbow Moonstone, Oval, Transparent

2.24ctw White Rainbow Moonstone, Oval, Transparent

7.2 x 6.1 mm

$ 73.65

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4.75ctw Green Prehnite, Oval, Transparent/Translucent

4.75ctw Green Prehnite, Oval, Transparent/Translucent

8.3 x 6.6 mm

$ 11.70

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1.10ctw Green Peridot, Marquise, VS

1.10ctw Green Peridot, Marquise, VS

8 x 4 mm (calibrated)

$ 16.43

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0.09ctw Black Diamond, Round, Opaque

0.09ctw Black Diamond, Round, Opaque

2.1 mm (calibrated)

$ 26.15

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5.02ctw Yellow Citrine, Oval, VVS-VS

5.02ctw Yellow Citrine, Oval, VVS-VS

10 x 8 mm (calibrated)

$ 27.50

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1.01ct Orange Hessonite Garnet, Pear Shape, VS-SI

1.01ct Orange Hessonite Garnet, Pear Shape, VS-SI

7.5 x 5.7 mm

$ 22.13

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2.45ctw Purple Rhodolite Garnet, Oval, VS

2.45ctw Purple Rhodolite Garnet, Oval, VS

5 x 4 mm (calibrated)

$ 26.49

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10.63ctw Multicolor Jasper, Trillion, Opaque

10.63ctw Multicolor Jasper, Trillion, Opaque

15.8 x 13.9 mm

$ 6.24

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5.95ct Violet Amethyst, Oval, VVS-VS

5.95ct Violet Amethyst, Oval, VVS-VS

14 x 11.3 mm

$ 34.57

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1.46ct Yellow Apatite, Oval, VS

1.46ct Yellow Apatite, Oval, VS

9 x 7 mm (calibrated)

$ 76.15

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2.12ct Orange Moonstone, Cushion, Translucent

2.12ct Orange Moonstone, Cushion, Translucent

9 x 7 mm (calibrated)

$ 4.22

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3.10ct Violet Amethyst, Trillion, VS

3.10ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 24.70

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0.85ct Brown Sillimanite Cat'S Eye, Oval, Translucent

0.85ct Brown Sillimanite Cat'S Eye, Oval, Translucent

6.4 x 4.6 mm

$ 2.54

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1.18ct Yellow Beryl, Oval, VVS-VS

1.18ct Yellow Beryl, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 29.38

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1.58ct Green Tourmaline, Emerald Cut, VVS

1.58ct Green Tourmaline, Emerald Cut, VVS

18.3 x 3.3 mm

$ 43.28

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2.45ctw Yellow Citrine, Round, VVS

2.45ctw Yellow Citrine, Round, VVS

7 mm (calibrated)

$ 19.52

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29.77ctw Multicolor Fossil Coral, Cushion, Opaque

29.77ctw Multicolor Fossil Coral, Cushion, Opaque

20.8 x 13.7 mm

$ 32.62

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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

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

Good selection prices are reasonable!

Posted By ToRa62 in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

The website has a good selection, the interface is very intuitive.

Posted By PhoenixFeatherJewelry in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

It was easy to navigate

Posted By GemGod 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 -> 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
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