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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
Untreated Gemstones Clarity
Untreated Gemstones Price
Untreated Gemstones Treatment

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Bi-color Untreated Gemstones
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Yellow Untreated Gemstones
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10.97ct Gray Star Sapphire, Round, Opaque
Star Sapphire Product Video (470800)

10.97ct Gray Star Sapphire, Round, Opaque

12 mm (calibrated)

$ 420.66

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0.87ct Yellow Color-Change Diaspore, Emerald Cut, VS

0.87ct Yellow Color-Change Diaspore, Emerald Cut, VS

5.7 x 4.6 mm

$ 26.69

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0.63ct Yellow Color-Change Diaspore, Round, VS-SI

0.63ct Yellow Color-Change Diaspore, Round, VS-SI

5.3 mm

$ 22.66

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1.50ct Purple Rhodolite Garnet, Oval, VS

1.50ct Purple Rhodolite Garnet, Oval, VS

8 x 6 mm (calibrated)

$ 61.54

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2.18ct Green Tourmaline, Emerald Cut, VVS-VS

2.18ct Green Tourmaline, Emerald Cut, VVS-VS

23 x 3.5 mm

$ 59.71

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0.33ct Blue Kyanite, Round, VS

0.33ct Blue Kyanite, Round, VS

3.8 mm

$ 5.92

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5.69ct Green Uvarovite Garnet Drusy, Oval, Opaque

5.69ct Green Uvarovite Garnet Drusy, Oval, Opaque

15 x 10 mm (calibrated)

$ 18.51

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21.50ct Brown Tiger'S Eye, Fancy, Opaque

21.50ct Brown Tiger'S Eye, Fancy, Opaque

31.5 x 9.2 mm

$ 11.79

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0.86ctw Green Peridot, Pear Shape, VVS-VS

0.86ctw Green Peridot, Pear Shape, VVS-VS

6 x 4 mm (calibrated)

$ 6.59

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16.43ct Purple Ruby-Zoisite, Flower Cut, Opaque

16.43ct Purple Ruby-Zoisite, Flower Cut, Opaque

14.7 x 13.7 mm

$ 19.62

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0.07ct Black Diamond, Square, Opaque

0.07ct Black Diamond, Square, Opaque

2 x 1.9 mm

$ 34.86

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30.20ct Violet Amethyst, Oval, IF

30.20ct Violet Amethyst, Oval, IF

21.1 x 16.4 mm

$ 200.53

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1.52ctw White Rainbow Moonstone, Pear Shape, Transparent

1.52ctw White Rainbow Moonstone, Pear Shape, Transparent

5 x 5 mm (calibrated)

$ 28.30

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0.85ct Yellow Sphene, Oval, Transparent

0.85ct Yellow Sphene, Oval, Transparent

6 x 5.1 mm

$ 4.23

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12.53ctw Brown Tiger'S Eye, Baguette, Opaque

12.53ctw Brown Tiger'S Eye, Baguette, Opaque

12 x 10 mm (calibrated)

$ 12.48

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0.93ct Green Cat'S Eye Alexandrite, Oval, Opaque

0.93ct Green Cat'S Eye Alexandrite, Oval, Opaque

6 x 4 mm (calibrated)

$ 192.98

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3.66ct Yellow Citrine, Square, VS
Citrine Product Video (547561)

3.66ct Yellow Citrine, Square, VS

9 x 9 mm (calibrated)

$ 18.23

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5.84ct Brown Smoky Quartz, Round, VVS-VS

5.84ct Brown Smoky Quartz, Round, VVS-VS

12 mm (calibrated)

$ 9.60

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13.24ct Yellow Calcite, Pear Shape, Translucent

13.24ct Yellow Calcite, Pear Shape, Translucent

30.2 x 17 mm

$ 9.11

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1.98ct Yellow Sillimanite, Oval, VS
Sillimanite Product Video (411422)

1.98ct Yellow Sillimanite, Oval, VS

9 x 7 mm (calibrated)

$ 48.96

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0.36ct Yellow Chrysoberyl Cat'S Eye, Oval, Translucent

0.36ct Yellow Chrysoberyl Cat'S Eye, Oval, Translucent

4.4 x 4.4 mm

$ 10.76

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2.73ctw Red Spessartite Garnet, Round, VVS-VS

2.73ctw Red Spessartite Garnet, Round, VVS-VS

5 mm (calibrated)

$ 92.72

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0.77ct Green Tourmaline, Emerald Cut, VVS-VS

0.77ct Green Tourmaline, Emerald Cut, VVS-VS

11.7 x 3 mm

$ 25.31

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0.56ct Multicolor Labradorite, Pear Shape, Transparent

0.56ct Multicolor Labradorite, Pear Shape, Transparent

7.2 x 4.3 mm

$ 1.24

View Gem
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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

My experience was done with ease

Posted By Barb in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

My experience has always been fantastic. Today I saved 6 gems to email a customer looking for a particular color blend to fit into an east west setting, so her options were limited, but we found one she wanted, deleted all the others in the cart and order the gem she selected. It was helpful to be able to put them in the cart so I could save them until she selected the one she wanted without having to research all of them again.

Posted By RJ in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

It was easy to navigate

Posted By GemGod in July, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

It was fine . Wish there had been more round stones to select from

Posted By Emm in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love beauty, color, quality, and price of these gems. Personal projects and will come here soon and everytime.

Posted By Darkstar in June, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

I did not realize these stones were of jewelry quality. They are really beautiful, just not what I was expecting which was more of a natural stone.

Posted By Jewelry Quality Stones in July, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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