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Home › Gemstones › Untreated Gemstones

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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Untreated Gemstones Treatment

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Bi-color Untreated Gemstones
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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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9.61ctw Multicolor Tourmaline, Flower Cut, Transparent
Tourmaline Product Video (690533)

9.61ctw Multicolor Tourmaline, Flower Cut, Transparent

14 x 14 mm (calibrated)

$ 187.31

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0.25ct Violet Iolite, Emerald Cut, VS

0.25ct Violet Iolite, Emerald Cut, VS

5 x 3 mm (calibrated)

$ 9.96

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22.21ct Violet Amethyst, Round, VVS-VS

22.21ct Violet Amethyst, Round, VVS-VS

20 mm (calibrated)

$ 154.84

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6.95ctw Yellow Citrine, Oval, VVS-VS

6.95ctw Yellow Citrine, Oval, VVS-VS

11 x 9 mm (calibrated)

$ 38.08

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4.58ct Pink Morganite, Round, Transparent

4.58ct Pink Morganite, Round, Transparent

10 mm (calibrated)

$ 50.18

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7.87ct White Rainbow Moonstone, Baguette, Transparent

7.87ct White Rainbow Moonstone, Baguette, Transparent

16.5 x 7.1 mm

$ 62.71

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2.10ct Orange Hessonite Garnet, Emerald Cut, VS-SI

2.10ct Orange Hessonite Garnet, Emerald Cut, VS-SI

8.6 x 6.7 mm

$ 35.79

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9.17ct Green Prehnite, Fancy, Transparent

9.17ct Green Prehnite, Fancy, Transparent

17.9 x 12.4 mm

$ 12.77

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24.86ctw Multicolor Labradorite, Round, Translucent

24.86ctw Multicolor Labradorite, Round, Translucent

20 mm (calibrated)

$ 54.47

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2.16ct Purple Rhodolite Garnet, Oval, VS

2.16ct Purple Rhodolite Garnet, Oval, VS

8.5 x 6.7 mm

$ 71.71

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0.87ctw Green Peridot, Pear Shape, VVS-VS

0.87ctw Green Peridot, Pear Shape, VVS-VS

6 x 4 mm (calibrated)

$ 7.63

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1.42ctw Green Demantoid Garnet, Oval, VS

1.42ctw Green Demantoid Garnet, Oval, VS

4.5 x 3.7 mm

$ 155.58

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3.75ct Brown Tiger'S Eye, Oval, Opaque

3.75ct Brown Tiger'S Eye, Oval, Opaque

11 x 9 mm (calibrated)

$ 3.74

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3.50ct Violet Amethyst, Oval, VS

3.50ct Violet Amethyst, Oval, VS

11.2 x 8.6 mm

$ 27.89

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11.06ctw Blue Chalcedony, Oval, Translucent

11.06ctw Blue Chalcedony, Oval, Translucent

14 x 10 mm (calibrated)

$ 9.21

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0.68ct Pink Spinel, Cushion, VVS

0.68ct Pink Spinel, Cushion, VVS

5.6 x 4.3 mm

$ 56.44

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9.88ct Multicolor Quartz With Marcasite, Oval, Transparent

9.88ct Multicolor Quartz With Marcasite, Oval, Transparent

16 x 12 mm (calibrated)

$ 64.95

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5.61ct Violet Amethyst, Fancy, Transparent

5.61ct Violet Amethyst, Fancy, Transparent

12.8 x 10.2 mm

$ 33.52

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0.33ct Pink Morganite, Trillion, VVS-VS

0.33ct Pink Morganite, Trillion, VVS-VS

4.9 x 4.6 mm

$ 14.79

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1.76ct Blue Kyanite, Oval, VS-SI

1.76ct Blue Kyanite, Oval, VS-SI

8 x 6 mm (calibrated)

$ 36.64

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4.45ct Violet Amethyst, Pear Shape, VVS

4.45ct Violet Amethyst, Pear Shape, VVS

14 x 10 mm (calibrated)

$ 32.32

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35.93ct Multicolor Jasper, Pear Shape, Opaque

35.93ct Multicolor Jasper, Pear Shape, Opaque

25.5 x 25.3 mm

$ 16.53

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3.21ct Orange Sunstone, Round, Translucent

3.21ct Orange Sunstone, Round, Translucent

10 mm (calibrated)

$ 18.72

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3.75ct Multicolor Pietersite, Cushion, Opaque

3.75ct Multicolor Pietersite, Cushion, Opaque

13 x 9 mm (calibrated)

$ 8.86

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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

All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.

Posted By G.W. in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.

Posted By Fried Rice in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I could see the actual gem I was buying

Posted By Bugs in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The citrine gems are beautiful. I appreciated that each stone was individually shown on the website so I could see exactly what I was getting. No mystery person selecting random stones for me. The documentation included with each gem was high quality as well. Great price and arrived as expected.

Posted By Jen 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

Overall Rating -> 8 star ratings

It was fine

Posted By Na in April, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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