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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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Untreated Gemstones Treatment

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Bi-color Untreated Gemstones
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2.28ct Orange Moonstone, Square, Transparent

2.28ct Orange Moonstone, Square, Transparent

7 x 7 mm (calibrated)

$ 4.57

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2.25ctw Violet Amethyst, Marquise, VVS-VS

2.25ctw Violet Amethyst, Marquise, VVS-VS

10 x 5 mm (calibrated)

$ 14.94

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12.70ct Black Tourmaline, Oval, Opaque

12.70ct Black Tourmaline, Oval, Opaque

16 x 13.5 mm

$ 63.25

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2.10ct Pink Strawberry Quartz, Oval, Transparent

2.10ct Pink Strawberry Quartz, Oval, Transparent

10 x 8 mm (calibrated)

$ 15.60

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1.56ct Orange Moonstone, Cushion, Translucent

1.56ct Orange Moonstone, Cushion, Translucent

7 x 7 mm (calibrated)

$ 3.13

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11.86ct Green Amazonite, Cushion, Opaque

11.86ct Green Amazonite, Cushion, Opaque

18.6 x 14.5 mm

$ 10.04

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0.87ct Green Tourmaline, Oval, Transparent

0.87ct Green Tourmaline, Oval, Transparent

6.5 x 5.1 mm

$ 14.43

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1.22ct Multicolor Opal, Oval, Transparent

1.22ct Multicolor Opal, Oval, Transparent

10 x 8 mm (calibrated)

$ 25.32

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2.36ct Green Tourmaline, Emerald Cut, VVS-VS

2.36ct Green Tourmaline, Emerald Cut, VVS-VS

15.9 x 4.3 mm

$ 64.64

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1.04ct Blue Kyanite, Oval, VS-SI

1.04ct Blue Kyanite, Oval, VS-SI

7 x 5 mm (calibrated)

$ 22.79

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1.33ct Multicolor Opal, Oval, Transparent

1.33ct Multicolor Opal, Oval, Transparent

12.7 x 7.2 mm

$ 27.60

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2.48ctw Violet Amethyst, Oval, VVS-VS

2.48ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 13.59

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1.61ct Violet Amethyst, Marquise, VS

1.61ct Violet Amethyst, Marquise, VS

12.1 x 6.1 mm

$ 10.59

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1.05ct Orange Sunstone, Oval, Translucent

1.05ct Orange Sunstone, Oval, Translucent

8 x 6 mm (calibrated)

$ 7.32

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1.43ct Green Tourmaline, Oval, Transparent

1.43ct Green Tourmaline, Oval, Transparent

8 x 6 mm (calibrated)

$ 26.10

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1.82ctw Green Peridot, Oval, VVS-VS

1.82ctw Green Peridot, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 25.38

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0.87ct Yellow Beryl, Oval, VVS-VS

0.87ct Yellow Beryl, Oval, VVS-VS

8 x 5.7 mm

$ 21.66

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5.68ctw Green Prehnite, Round, Transparent

5.68ctw Green Prehnite, Round, Transparent

8 mm (calibrated)

$ 30.87

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40.98ct Red Star Garnet, Round, Opaque

40.98ct Red Star Garnet, Round, Opaque

17 mm (calibrated)

$ 40.40

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1.69ct Purple Spinel, Cushion, VVS-VS

1.69ct Purple Spinel, Cushion, VVS-VS

7.5 x 6.3 mm

$ 280.54

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23.63ctw Multicolor Fossil Coral, Oval, Opaque

23.63ctw Multicolor Fossil Coral, Oval, Opaque

20.6 x 11.9 mm

$ 42.20

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0.91ct Pink Tourmaline, Round, Transparent

0.91ct Pink Tourmaline, Round, Transparent

6 mm (calibrated)

$ 15.08

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0.45ct Orange Sphalerite, Round, SI

0.45ct Orange Sphalerite, Round, SI

4.5 mm (calibrated)

$ 22.41

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17.06ct Violet Amethyst, Cushion, VVS-VS

17.06ct Violet Amethyst, Cushion, VVS-VS

20 x 15 mm (calibrated)

$ 118.94

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

Great site for finding specific stones and sizes for individual pieces of jewelry

Posted By Designer in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Recomendado Totalmente Los Productos Se Entregaron A Tiempo

Posted By Alexis in May, 2026
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

My experience was done with ease

Posted By Barb in October, 2025
Source: Bizrate

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 -> 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
→ View All GemSelect Reviews on Bizrate
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