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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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1.58ct Green Sphene, Oval, Transparent

1.58ct Green Sphene, Oval, Transparent

6.9 x 6.2 mm

$ 7.87

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18.19ct Multicolor Boulder Opal, Pear Shape, Opaque

18.19ct Multicolor Boulder Opal, Pear Shape, Opaque

27.8 x 14.8 mm

$ 126.82

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13.35ct Black Spinel, Baguette, Opaque

13.35ct Black Spinel, Baguette, Opaque

20.1 x 10.1 mm

$ 43.88

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26.19ct Green Aventurine, Fancy, Opaque

26.19ct Green Aventurine, Fancy, Opaque

38.3 x 9.3 mm

$ 6.52

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3.65ctw Yellow Citrine, Square, VS
Citrine Product Video (556566)

3.65ctw Yellow Citrine, Square, VS

7 x 7 mm (calibrated)

$ 25.35

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2.98ct White Rainbow Moonstone, Round, Transparent

2.98ct White Rainbow Moonstone, Round, Transparent

9 mm (calibrated)

$ 50.73

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12.30ct Brown Tiger'S Eye, Baguette, Opaque

12.30ct Brown Tiger'S Eye, Baguette, Opaque

18 x 13 mm (calibrated)

$ 12.25

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30.74ctw Multicolor Moss Agate, Oval, Translucent

30.74ctw Multicolor Moss Agate, Oval, Translucent

29.2 x 14.4 mm

$ 30.62

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3.33ctw White Topaz, Cushion, VVS-VS

3.33ctw White Topaz, Cushion, VVS-VS

4.6 x 4.5 mm

$ 18.24

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22.34ct White Rainbow Moonstone, Oval, Translucent

22.34ct White Rainbow Moonstone, Oval, Translucent

26.3 x 13.8 mm

$ 22.25

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35.31ct Multicolor Jasper, Square, Opaque

35.31ct Multicolor Jasper, Square, Opaque

23 x 21.6 mm

$ 38.69

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2.11ct Green Peridot, Cushion, VS

2.11ct Green Peridot, Cushion, VS

9 x 7 mm (calibrated)

$ 90.15

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1.92ctw Gray Sillimanite Cat'S Eye, Oval, Transparent

1.92ctw Gray Sillimanite Cat'S Eye, Oval, Transparent

6.9 x 4.7 mm

$ 6.06

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3.37ctw Green Prehnite, Oval, Transparent

3.37ctw Green Prehnite, Oval, Transparent

7.5 x 6.8 mm

$ 18.47

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0.88ct Yellow Sphalerite, Round, SI

0.88ct Yellow Sphalerite, Round, SI

5.5 mm (calibrated)

$ 43.82

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2.70ct Yellow Citrine, Oval, Transparent

2.70ct Yellow Citrine, Oval, Transparent

10 x 8 mm (calibrated)

$ 20.71

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8.51ctw Multicolor Labradorite, Round, Translucent

8.51ctw Multicolor Labradorite, Round, Translucent

10 mm (calibrated)

$ 8.47

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1.03ct Orange Zircon, Oval, VVS

1.03ct Orange Zircon, Oval, VVS

6 x 4.9 mm

$ 12.82

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17.42ct Black Obsidian, Pear Shape, Opaque

17.42ct Black Obsidian, Pear Shape, Opaque

25.6 x 16 mm

$ 28.63

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63.98ct Brown Tiger'S Eye, Oval, Opaque

63.98ct Brown Tiger'S Eye, Oval, Opaque

35.5 x 26.1 mm

$ 35.05

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24.67ctw Multicolor Fossil Coral, Oval, Opaque

24.67ctw Multicolor Fossil Coral, Oval, Opaque

20 x 12.4 mm

$ 27.03

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16.38ct Violet Amethyst, Pear Shape, VVS

16.38ct Violet Amethyst, Pear Shape, VVS

21.2 x 16 mm

$ 114.20

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0.54ct Green Chrome Diopside, Oval, VS

0.54ct Green Chrome Diopside, Oval, VS

6 x 4 mm (calibrated)

$ 13.45

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9.58ct Multicolor Agate, Oval, Opaque

9.58ct Multicolor Agate, Oval, Opaque

13 x 12.1 mm

$ 9.06

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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 stones are very nice.

Posted By Mvk in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

hassle free experience.

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

I liked the selection of gems, and price. I did not like your PayPal process. I already have a PP account and you want me to sign up for another.

Posted By CLTCJH in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Had a great experience and the prices are great

Posted By BuBx99 in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Good selection, using for custom jewlery for my wife.

Posted By Smitty in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The site provided lots of detail, factual data, and good photos. I also like the availability of searching by price range as well as by the type of stone.

Posted By SLIntuitive Donna in July, 2025
Source: Bizrate
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