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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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17.51ct Multicolor Tiger'S Eye Matrix, Cushion, Opaque

17.51ct Multicolor Tiger'S Eye Matrix, Cushion, Opaque

22.1 x 14 mm

$ 17.44

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2.78ct Violet Amethyst, Trillion, VVS-VS

2.78ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 20.83

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1.48ct Black Cat'S Eye Scapolite, Oval, Translucent

1.48ct Black Cat'S Eye Scapolite, Oval, Translucent

7.8 x 5.5 mm

$ 8.11

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2.99ctw White Topaz, Cushion, VVS-VS

2.99ctw White Topaz, Cushion, VVS-VS

4.6 x 4.5 mm

$ 16.38

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1.40ct Red Tourmaline, Oval, VVS-VS

1.40ct Red Tourmaline, Oval, VVS-VS

7.7 x 6.7 mm

$ 209.16

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8.42ct Multicolor Boulder Opal, Oval, Opaque

8.42ct Multicolor Boulder Opal, Oval, Opaque

18.8 x 13.8 mm

$ 58.71

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3.10ct Green Sphene, Oval, Translucent

3.10ct Green Sphene, Oval, Translucent

10 x 7 mm (calibrated)

$ 16.98

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2.03ct Orange Hessonite Garnet, Emerald Cut, VS

2.03ct Orange Hessonite Garnet, Emerald Cut, VS

7 x 7 mm (calibrated)

$ 30.19

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1.00ct Multicolor Opal, Oval, Transparent

1.00ct Multicolor Opal, Oval, Transparent

9.6 x 6.3 mm

$ 29.88

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9.65ct Multicolor Boulder Opal, Marquise, Opaque

9.65ct Multicolor Boulder Opal, Marquise, Opaque

25.3 x 10.3 mm

$ 67.28

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0.35ct Green Kornerupine, Emerald Cut, VS-SI

0.35ct Green Kornerupine, Emerald Cut, VS-SI

5 x 3.4 mm

$ 29.98

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1.27ct Yellow Citrine, Trillion, VS

1.27ct Yellow Citrine, Trillion, VS

7 x 7 mm (calibrated)

$ 6.96

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3.78ct Multicolor Labradorite, Marquise, Translucent

3.78ct Multicolor Labradorite, Marquise, Translucent

14 x 7 mm (calibrated)

$ 8.36

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4.08ct Yellow Citrine, Oval, VS

4.08ct Yellow Citrine, Oval, VS

12 x 10 mm (calibrated)

$ 22.35

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4.59ct Multicolor Pietersite, Oval, Opaque

4.59ct Multicolor Pietersite, Oval, Opaque

16.9 x 11.3 mm

$ 13.71

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3.22ct Yellow Rutile Topaz, Pear Shape, Transparent

3.22ct Yellow Rutile Topaz, Pear Shape, Transparent

11.4 x 8 mm

$ 66.82

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0.52ct White Opal, Oval, Transparent

0.52ct White Opal, Oval, Transparent

7.2 x 5.3 mm

$ 12.95

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0.97ct Yellow Color-Change Diaspore, Emerald Cut, VS

0.97ct Yellow Color-Change Diaspore, Emerald Cut, VS

7 x 4.5 mm

$ 29.76

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0.94ctw Green Peridot, Pear Shape, VVS-VS

0.94ctw Green Peridot, Pear Shape, VVS-VS

6 x 4 mm (calibrated)

$ 7.21

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1.01ct Purple Rhodolite Garnet, Oval, VS

1.01ct Purple Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 26.83

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9.19ct White Dendritic Agate, Pear Shape, Opaque

9.19ct White Dendritic Agate, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 7.32

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0.22ct Violet Iolite, Square, VS

0.22ct Violet Iolite, Square, VS

4 x 4 mm (calibrated)

$ 8.76

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10.13ct Green Uvarovite Garnet Drusy, Fancy, Opaque

10.13ct Green Uvarovite Garnet Drusy, Fancy, Opaque

14.7 x 13.8 mm

$ 32.96

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0.60ct Orange Zircon, Oval, VVS

0.60ct Orange Zircon, Oval, VVS

5 x 4 mm (calibrated)

$ 8.96

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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 have purchased stones from gem select in the past and have been very satisfied. I expect to repeat that experience with this purchase as well

Posted By Marti in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.

Posted By Atsuhisa in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I can pick and choose from large selection and find just what I need for .y projects, currently my cane.

Posted By Darkstar731 in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

overall great

Posted By SR in April, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Nothing bad to report. Everything is as expected. The gems and the price are all very good.

Posted By Dafanatic in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Took a chance on purchasing my gemstones from Gemselect and was impressed. 10/10

Posted By KT in September, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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