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Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
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0.85ct Gray Sillimanite Cat'S Eye, Oval, Transparent

0.85ct Gray Sillimanite Cat'S Eye, Oval, Transparent

6.5 x 4.3 mm

$ 2.80

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0.79ctw Blue Kyanite, Oval, SI-I1

0.79ctw Blue Kyanite, Oval, SI-I1

5.4 x 3.5 mm

$ 17.31

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2.85ct Yellow Apatite, Emerald Cut, VVS-VS

2.85ct Yellow Apatite, Emerald Cut, VVS-VS

8.5 x 8.4 mm

$ 146.76

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0.24ct Violet Iolite, Emerald Cut, VS-SI

0.24ct Violet Iolite, Emerald Cut, VS-SI

5 x 3 mm (calibrated)

$ 9.56

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1.38ct Pink Tourmaline, Oval, VVS-VS

1.38ct Pink Tourmaline, Oval, VVS-VS

7.1 x 6.3 mm

$ 211.67

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5.12ctw Multicolor Opal, Round, Translucent

5.12ctw Multicolor Opal, Round, Translucent

8 mm (calibrated)

$ 157.07

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2.12ctw Multicolor Andalusite, Oval, VS

2.12ctw Multicolor Andalusite, Oval, VS

4 x 3 mm (calibrated)

$ 113.25

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1.41ctw Red Pyrope Garnet, Square, VS

1.41ctw Red Pyrope Garnet, Square, VS

5 x 5 mm (calibrated)

$ 10.81

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2.15ct Yellow Apatite, Emerald Cut, VS

2.15ct Yellow Apatite, Emerald Cut, VS

8 x 8 mm (calibrated)

$ 110.71

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2.00ct Orange Hessonite Garnet, Cushion, VS-SI

2.00ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 34.07

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3.07ctw Yellow Citrine, Emerald Cut, VVS

3.07ctw Yellow Citrine, Emerald Cut, VVS

8 x 6 mm (calibrated)

$ 24.46

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10.02ct White Rainbow Moonstone, Baguette, Transparent

10.02ct White Rainbow Moonstone, Baguette, Transparent

17.5 x 10.9 mm

$ 79.84

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4.47ct Pink Rose Quartz, Square, Transparent

4.47ct Pink Rose Quartz, Square, Transparent

10 x 10 mm (calibrated)

$ 24.49

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4.09ctw Multicolor Spectrolite, Oval, Opaque

4.09ctw Multicolor Spectrolite, Oval, Opaque

10.1 x 8.3 mm

$ 18.69

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1.05ct Yellow Zircon, Oval, VVS-VS

1.05ct Yellow Zircon, Oval, VVS-VS

5 x 5 mm (calibrated)

$ 15.69

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12.45ct White Rainbow Moonstone, Pear Shape, Transparent

12.45ct White Rainbow Moonstone, Pear Shape, Transparent

18 x 13 mm (calibrated)

$ 223.20

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0.80ct Pink Spinel, Cushion, VVS-VS

0.80ct Pink Spinel, Cushion, VVS-VS

5.8 x 5 mm

$ 39.84

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2.16ctw Red Rhodolite Garnet, Oval, VS-SI

2.16ctw Red Rhodolite Garnet, Oval, VS-SI

7 x 5 mm (calibrated)

$ 57.37

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0.72ct Green Sphene, Oval, Transparent

0.72ct Green Sphene, Oval, Transparent

5.8 x 4.7 mm

$ 3.59

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1.43ct Pink Strawberry Quartz, Oval, Transparent

1.43ct Pink Strawberry Quartz, Oval, Transparent

8 x 6 mm (calibrated)

$ 7.14

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1.33ct Green Tourmaline, Oval, Transparent

1.33ct Green Tourmaline, Oval, Transparent

7 x 5.6 mm

$ 22.80

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4.76ct Pink Strawberry Quartz, Round, Translucent

4.76ct Pink Strawberry Quartz, Round, Translucent

11 mm (calibrated)

$ 36.50

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2.78ct Yellow Citrine, Flower Cut, Transparent

2.78ct Yellow Citrine, Flower Cut, Transparent

9 x 9 mm (calibrated)

$ 21.32

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0.37ct Yellow Sphalerite, Oval, VS-SI

0.37ct Yellow Sphalerite, Oval, VS-SI

4.4 x 3.8 mm

$ 18.43

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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 -> 7 star ratings

easy interface for a pricless buy

Posted By Zeak in May, 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

Overall Rating -> 10 star ratings

I love the product and the details about each of them.

Posted By Love It! in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Love, and have always loved, your website.

Posted By Aberabic in July, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Will know more once order received

Posted By Jim in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I have shopped at Gemselect for nearly 20 years. I especially like that you see pictures of the exact gem you are purchasing. You are a trusted source.

Posted By DNaber in October, 2025
Source: Bizrate
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