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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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Yellow Untreated Gemstones
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4.85ct Green Seraphinite, Round, Opaque

12 mm (calibrated)

$ 4.69

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11.51ct Multicolor Cinnabar, Cushion, Opaque

17 x 17 mm (calibrated)

$ 13.47

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1.10ctw Red Pyrope Garnet, Heart, VVS-VS

5 x 5 mm (calibrated)

$ 27.39

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1.10ct Red Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 29.22

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3.53ctw Brown Smoky Quartz, Round, VS

8 mm (calibrated)

$ 7.74

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0.33ct Green Kornerupine, Oval, VS-SI

5.1 x 3.6 mm

$ 28.27

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5.41ct Violet Amethyst, Oval, Transparent

12 x 10 mm (calibrated)

$ 29.64

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1.11ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

6.6 x 5 mm

$ 58.08

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13.59ct Brown Tiger'S Eye, Oval, Opaque

20 x 15 mm (calibrated)

$ 13.54

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3.41ctw Multicolor Spectrolite, Round, Opaque

8 mm (calibrated)

$ 15.59

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1.72ct Pink Tourmaline, Round, Transparent

7 mm (calibrated)

$ 29.48

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4.98ct Violet Amethyst, Cushion, VS

14.8 x 9 mm

$ 29.76

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0.82ct Orange Hessonite Garnet, Pear Shape, SI

7 x 5 mm (calibrated)

$ 15.27

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0.75ct Yellow Color-Change Diaspore, Cushion, VVS

6.2 x 5.1 mm

$ 39.59

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5.29ctw White Rutile Quartz, Round, Transparent

9 mm (calibrated)

$ 10.54

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3.15ct Turquoise Fluorite, Oval, Transparent

8.7 x 7.4 mm

$ 12.55

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6.03ct Multicolor Ruby-Zoisite, Marquise, Opaque

22 x 7.8 mm

$ 18.17

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1.05ct Multicolor Opal, Pear Shape, Transparent

9 x 6 mm (calibrated)

$ 26.15

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0.77ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7.4 x 4.5 mm

$ 2.53

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17.00ct Green Bloodstone, Oval, Opaque

20.6 x 16.9 mm

$ 25.40

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5.16ct Yellow Citrine, Oval, VVS-VS

14 x 10 mm (calibrated)

$ 30.98

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21.45ct Bi-Color Ametrine, Marquise, VS

30.2 x 13.4 mm

$ 164.51

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13.55ct Violet Amethyst, Cushion, VVS

15 x 15 mm (calibrated)

$ 94.47

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15.89ct Multicolor Amethyst Geode Slice, Fancy, Transparent

21.8 x 16.9 mm

$ 16.93

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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!

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I was able to find what I wanted very easily!

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Over pretty well experience the your website no complaints about it very easy reliable service provided

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Great experience. I can't wait to explore on the website further.

Posted By Kymmie in September, 2025
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Great site for finding specific stones and sizes for individual pieces of jewelry

Posted By Designer in December, 2025
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Easy process.

Posted By Crafty Seabee in March, 2026
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I had a very easy time navigating the web page and using filters to find what I was looking for. The varied selection was nice to see and pricing is clear and fair.

Posted By Mattick in May, 2026
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