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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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1.50ct Orange Zircon, Round, VVS-VS

6.5 mm (calibrated)

$ 32.87

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37.10ct Multicolor Jasper, Oval, Opaque

33.4 x 21.9 mm

$ 25.86

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2.49ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 13.65

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3.07ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 21.41

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1.08ct Yellow Color-Change Diaspore, Cushion, VVS

9.4 x 4.7 mm

$ 55.62

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9.69ct Multicolor Pietersite, Pear Shape, Opaque

25.3 x 11.7 mm

$ 32.17

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16.86ct Multicolor Agate, Oval, Opaque

17 x 14 mm

$ 16.79

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12.58ctw Multicolor Jasper, Pear Shape, Opaque

19 x 12.5 mm

$ 7.14

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4.55ct Red Rhodolite Garnet, Heart, VS

10.6 x 9.7 mm

$ 188.83

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1.67ct Multicolor Opal, Pear Shape, Translucent

12.6 x 7.6 mm

$ 64.04

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3.80ct Yellow Citrine, Emerald Cut, VVS

12 x 8 mm (calibrated)

$ 29.14

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0.09ct Black Diamond, Round, Opaque

2.6 mm (calibrated)

$ 30.81

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0.76ct Blue Kyanite, Round, SI

5.2 mm

$ 18.92

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1.53ct Orange Hessonite Garnet, Oval, VS

8 x 6 mm (calibrated)

$ 23.37

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19.31ct Green Bloodstone, Oval, Opaque

16.4 x 14.1 mm

$ 38.46

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18.07ct Violet Amethyst, Pear Shape, VVS

21.1 x 16.1 mm

$ 125.99

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5.71ctw Multicolor Ruby In Fuchsite, Marquise, Translucent

14.9 x 7.6 mm

$ 42.10

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3.67ct Purple Kunzite, Cushion, VVS-VS

9.6 x 7 mm

$ 100.99

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1.79ct Multicolor Opal, Pear Shape, Translucent

12 x 8 mm (calibrated)

$ 45.02

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2.19ct Multicolor Spectrolite, Oval, Opaque

10 x 8 mm (calibrated)

$ 10.01

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1.65ct Pink Tourmaline, Emerald Cut, VVS-VS

10.3 x 4.6 mm

$ 124.74

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2.28ctw Orange Hessonite Garnet, Square, VS

6 x 6 mm (calibrated)

$ 49.96

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2.00ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 39.44

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27.33ct Green Jade, Fancy, Translucent

27.4 x 15.5 mm

$ 17.07

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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 -> 9 star ratings

Easy to use. Many options to find the right gemstone

Posted By Liz in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very food

Posted By Keeto in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very neat and to the point

Posted By Botha in March, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

It was fine

Posted By Na in April, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

It was a good interaction I got a good gemstone for cheap

Posted By Jon in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

It's mostly good, only some item's are easier to find through the search than the menu

Posted By Wayne in July, 2025
Source: Bizrate
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