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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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Yellow Untreated Gemstones
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12.36ct Green Maw-Sit-Sit, Oval, Opaque

12.36ct Green Maw-Sit-Sit, Oval, Opaque

14.7 x 12.4 mm

$ 40.63

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0.45ctw Blue Kyanite, Round, VS-SI

0.45ctw Blue Kyanite, Round, VS-SI

3.5 mm (calibrated)

$ 8.07

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3.42ct Yellow Citrine, Oval, VS

3.42ct Yellow Citrine, Oval, VS

12 x 10 mm (calibrated)

$ 18.73

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4.20ct Orange Sunstone, Oval, Translucent

4.20ct Orange Sunstone, Oval, Translucent

12 x 10 mm (calibrated)

$ 25.34

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3.37ctw Orange Hessonite Garnet, Emerald Cut, VS-SI

3.37ctw Orange Hessonite Garnet, Emerald Cut, VS-SI

8 x 6 mm (calibrated)

$ 51.50

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59.73ct Green Amazonite, Oval, Opaque

59.73ct Green Amazonite, Oval, Opaque

37 x 24.9 mm

$ 47.59

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1.68ct Brown Tiger'S Eye, Baguette, Opaque

1.68ct Brown Tiger'S Eye, Baguette, Opaque

8 x 6 mm (calibrated)

$ 11.64

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25.84ct Multicolor Pietersite, Oval, Opaque

25.84ct Multicolor Pietersite, Oval, Opaque

30 x 22 mm (calibrated)

$ 113.25

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8.64ct Multicolor Fire Agate, Fancy, Opaque

8.64ct Multicolor Fire Agate, Fancy, Opaque

21.6 x 8.9 mm

$ 67.78

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2.83ct Green Tourmaline, Emerald Cut, VS

2.83ct Green Tourmaline, Emerald Cut, VS

19.2 x 4 mm

$ 77.52

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6.58ct Multicolor Pietersite, Pear Shape, Opaque
Pietersite Product Video (658292)

6.58ct Multicolor Pietersite, Pear Shape, Opaque

17.6 x 12.1 mm

$ 19.66

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4.59ct Brown Smoky Quartz, Round, VVS

4.59ct Brown Smoky Quartz, Round, VVS

11 mm (calibrated)

$ 9.01

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1.73ct Orange Hessonite Garnet, Cushion, VS-SI

1.73ct Orange Hessonite Garnet, Cushion, VS-SI

8 x 6 mm (calibrated)

$ 34.46

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13.73ct Violet Amethyst, Cushion, VVS

13.73ct Violet Amethyst, Cushion, VVS

15 x 15 mm (calibrated)

$ 95.72

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3.44ctw Multicolor Labradorite, Pear Shape, Translucent

3.44ctw Multicolor Labradorite, Pear Shape, Translucent

9 x 6 mm (calibrated)

$ 7.61

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0.06ct Black Diamond, Square, Opaque

0.06ct Black Diamond, Square, Opaque

1.9 x 1.9 mm

$ 29.88

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1.52ct Orange Hessonite Garnet, Square, VS

1.52ct Orange Hessonite Garnet, Square, VS

6 x 6 mm (calibrated)

$ 25.56

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1.46ct Pink Tourmaline, Pear Shape, VS

1.46ct Pink Tourmaline, Pear Shape, VS

7.8 x 6.4 mm

$ 203.58

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1.63ct Orange Moonstone, Square, Transparent/Translucent

1.63ct Orange Moonstone, Square, Transparent/Translucent

7 x 7 mm (calibrated)

$ 3.27

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1.39ctw Red Rhodolite Garnet, Square, VS

1.39ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 11.06

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13.49ct Bi-Color Ametrine, Cushion, VVS

13.49ct Bi-Color Ametrine, Cushion, VVS

17.1 x 12.9 mm

$ 120.92

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6.27ct Multicolor Agate, Oval, Opaque

6.27ct Multicolor Agate, Oval, Opaque

12.9 x 10.3 mm

$ 5.00

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2.04ctw Blue Kyanite, Oval, VS-SI

2.04ctw Blue Kyanite, Oval, VS-SI

7 x 5.2 mm

$ 50.80

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10.49ct Red Pyrope Garnet, Emerald Cut, VS
Pyrope Garnet Product Video (740732)

10.49ct Red Pyrope Garnet, Emerald Cut, VS

17 x 9 mm

$ 304.73

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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 needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 2026
Source: Bizrate

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

Great selection. Maybe too great i kept adding and deleting stuff because i found better looking ones

Posted By Edsor works in October, 2025
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

Easy and functional

Posted By Dessa in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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