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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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8.24ct Multicolor Cinnabar, Oval, Opaque

8.24ct Multicolor Cinnabar, Oval, Opaque

17.5 x 11.5 mm

$ 9.64

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0.89ct Green Sphene, Oval, Transparent

0.89ct Green Sphene, Oval, Transparent

6.1 x 5.2 mm

$ 4.43

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2.40ct Orange Moonstone, Cushion, Translucent

2.40ct Orange Moonstone, Cushion, Translucent

8 x 8 mm (calibrated)

$ 4.78

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2.25ct Pink Tourmaline, Oval, Transparent

2.25ct Pink Tourmaline, Oval, Transparent

9 x 7 mm (calibrated)

$ 38.56

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0.63ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

0.63ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

6 x 3.8 mm

$ 33.26

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4.05ct Violet Amethyst, Pear Shape, VVS-VS

4.05ct Violet Amethyst, Pear Shape, VVS-VS

14 x 10 mm (calibrated)

$ 29.42

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5.26ct Multicolor Fire Agate, Fancy, Opaque

5.26ct Multicolor Fire Agate, Fancy, Opaque

12.6 x 10.3 mm

$ 41.09

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9.04ct Multicolor Ruby-Zoisite, Baguette, Opaque

9.04ct Multicolor Ruby-Zoisite, Baguette, Opaque

14 x 10 mm (calibrated)

$ 21.97

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7.21ctw Black Spinel, Round, Opaque

7.21ctw Black Spinel, Round, Opaque

9 mm (calibrated)

$ 23.70

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6.89ctw Multicolor Pietersite, Round, Opaque

6.89ctw Multicolor Pietersite, Round, Opaque

12 mm (calibrated)

$ 26.00

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0.77ct Purple Rhodolite Garnet, Oval, VS

0.77ct Purple Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 20.45

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3.05ct Violet Amethyst, Marquise, VVS

3.05ct Violet Amethyst, Marquise, VVS

15.2 x 7.2 mm

$ 21.26

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3.59ctw Orange Hessonite Garnet, Emerald Cut, VS

3.59ctw Orange Hessonite Garnet, Emerald Cut, VS

5 x 5 mm (calibrated)

$ 70.80

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2.11ct Multicolor Pietersite, Marquise, Opaque

2.11ct Multicolor Pietersite, Marquise, Opaque

15.3 x 5.7 mm

$ 5.11

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8.68ctw Red Hessonite Garnet, Oval, Translucent

8.68ctw Red Hessonite Garnet, Oval, Translucent

12 x 8 mm (calibrated)

$ 47.55

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5.24ct Brown Smoky Quartz, Emerald Cut, VVS-VS

5.24ct Brown Smoky Quartz, Emerald Cut, VVS-VS

13 x 10 mm

$ 22.97

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5.25ctw Green Prehnite, Oval, Transparent/Translucent

5.25ctw Green Prehnite, Oval, Transparent/Translucent

9.5 x 7.1 mm

$ 28.77

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21.44ct Black Obsidian, Pear Shape, Opaque

21.44ct Black Obsidian, Pear Shape, Opaque

27 x 20 mm (calibrated)

$ 10.67

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0.77ct Green Tourmaline, Emerald Cut, VVS

0.77ct Green Tourmaline, Emerald Cut, VVS

7.9 x 3.6 mm

$ 19.17

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5.12ct Multicolor Fire Agate, Fancy, Opaque

5.12ct Multicolor Fire Agate, Fancy, Opaque

14 x 9 mm (calibrated)

$ 39.38

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13.23ct Green Serpentine, Oval, Translucent

13.23ct Green Serpentine, Oval, Translucent

24.2 x 15.2 mm

$ 28.33

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0.71ct Pink Tourmaline, Oval, Transparent

0.71ct Pink Tourmaline, Oval, Transparent

6.3 x 4.7 mm

$ 11.76

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79.52ct Multicolor Jasper, Oval, Opaque

79.52ct Multicolor Jasper, Oval, Opaque

47.3 x 27.6 mm

$ 45.93

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3.32ct Black Cat'S Eye Scapolite, Oval, Translucent

3.32ct Black Cat'S Eye Scapolite, Oval, Translucent

9.5 x 7.4 mm

$ 18.19

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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

The website was easy to use and informative of the selection of stones it has. I quickly found the right stone for me.

Posted By Guero in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Absolutely love the website, selection and products. Can you guys add a gemstones with inclusions tab. I like those it'd be nice to have them all in one place but i do understand it would be alot of work to go through and categorize them. Thank you anyways

Posted By The homie edgar in December, 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

selection was broad and the check out was quick. Great site

Posted By JC Karl in September, 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

Love how easy the site is to use. Really love that the pictures are of actual product.

Posted By LeAnn in January, 2026
Source: Bizrate
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