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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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2.01ct Orange Hessonite Garnet, Cushion, SI

2.01ct Orange Hessonite Garnet, Cushion, SI

7 x 7 mm (calibrated)

$ 33.81

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2.47ctw Yellow Sillimanite, Oval, VVS-VS

2.47ctw Yellow Sillimanite, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 94.72

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21.64ctw Multicolor Labradorite, Oval, Translucent

21.64ctw Multicolor Labradorite, Oval, Translucent

20 x 15 mm (calibrated)

$ 43.11

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2.85ctw White Rainbow Moonstone, Pear Shape, Transparent

2.85ctw White Rainbow Moonstone, Pear Shape, Transparent

4.9 x 4.8 mm

$ 53.20

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0.64ct Green Peridot, Marquise, VS

0.64ct Green Peridot, Marquise, VS

8 x 4 mm (calibrated)

$ 9.56

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11.38ctw Black Star Diopside, Oval, Opaque

11.38ctw Black Star Diopside, Oval, Opaque

11 x 9 mm (calibrated)

$ 56.67

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12.26ct White Quartz, Emerald Cut, VVS-VS

12.26ct White Quartz, Emerald Cut, VVS-VS

15 x 15 mm (calibrated)

$ 40.30

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27.71ct Blue Turquoise, Oval, Opaque

27.71ct Blue Turquoise, Oval, Opaque

24 x 17.6 mm

$ 82.80

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25.74ctw Multicolor Fossil Coral, Cushion, Opaque

25.74ctw Multicolor Fossil Coral, Cushion, Opaque

18 x 13 mm (calibrated)

$ 27.64

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0.75ct Yellow Color-Change Diaspore, Oval, SI

0.75ct Yellow Color-Change Diaspore, Oval, SI

6.3 x 4.9 mm

$ 26.80

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11.00ct Brown Star Sunstone, Oval, Opaque

11.00ct Brown Star Sunstone, Oval, Opaque

13 x 13 mm (calibrated)

$ 91.30

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0.56ct Purple Spinel, Cushion, VVS

0.56ct Purple Spinel, Cushion, VVS

4.9 x 4.7 mm

$ 39.04

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5.89ct Orange Sunstone, Oval, Translucent

5.89ct Orange Sunstone, Oval, Translucent

14 x 10 mm (calibrated)

$ 31.21

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1.11ct Yellow Apatite, Pear Shape, VS

1.11ct Yellow Apatite, Pear Shape, VS

8.2 x 5.7 mm

$ 52.27

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25.02ctw Multicolor Jasper, Oval, Opaque

25.02ctw Multicolor Jasper, Oval, Opaque

18 x 13 mm (calibrated)

$ 27.41

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11.95ct Black Tourmaline, Emerald Cut, Opaque

11.95ct Black Tourmaline, Emerald Cut, Opaque

13.8 x 11.1 mm

$ 59.51

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0.60ct Orange Zircon, Oval, VVS-VS

0.60ct Orange Zircon, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 14.94

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17.18ct Blue Chalcedony, Pear Shape, Opaque

17.18ct Blue Chalcedony, Pear Shape, Opaque

25 x 18 mm (calibrated)

$ 42.78

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9.80ct Multicolor Pietersite, Pear Shape, Opaque

9.80ct Multicolor Pietersite, Pear Shape, Opaque

22.1 x 12.8 mm

$ 32.54

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0.46ct Yellow Color-Change Diaspore, Pear Shape, VVS

0.46ct Yellow Color-Change Diaspore, Pear Shape, VVS

7.9 x 4.1 mm

$ 24.29

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3.33ct Yellow Sphene, Oval, Transparent

3.33ct Yellow Sphene, Oval, Transparent

9.3 x 7.7 mm

$ 18.24

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40.07ct Multicolor Jasper, Trillion, Opaque
Jasper Product Video (348917)

40.07ct Multicolor Jasper, Trillion, Opaque

33.3 x 24 mm

$ 43.91

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8.67ct Multicolor Agate, Round, Opaque

8.67ct Multicolor Agate, Round, Opaque

12 mm (calibrated)

$ 14.68

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2.64ctw Pink Tourmaline, Round, Transparent

2.64ctw Pink Tourmaline, Round, Transparent

6.5 mm (calibrated)

$ 43.76

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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

Plan on purchasing on an ongoing basis. So far.....so good....

Posted By Jim in January, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.

Posted By Meyeusername in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I love the product and the details about each of them.

Posted By Love It! in July, 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

Overall Rating -> 8 star ratings

Good prices

Posted By TRM in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Good. I ts very user friendly.

Posted By Shalini in June, 2025
Source: Bizrate
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