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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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11.58ct Green Prehnite, Fancy, Translucent

16 x 12 mm (calibrated)

$ 20.05

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5.47ct Multicolor Fire Agate, Fancy, Translucent

17.1 x 8.6 mm

$ 47.58

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1.03ct Pink Morganite, Cushion, VVS-VS

8 x 5.3 mm

$ 45.14

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9.84ct Black Nuummite, Oval, Opaque

14 x 12 mm (calibrated)

$ 40.38

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1.11ctw Green Peridot, Marquise, VS

8 x 4 mm (calibrated)

$ 9.95

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21.23ctw Black Spinel, Oval, Opaque

16 x 12 mm (calibrated)

$ 81.41

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0.70ct Green Peridot, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 12.55

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1.09ct Blue Kyanite, Oval, VS-SI

7 x 5 mm (calibrated)

$ 23.89

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0.82ct Pink Malaya Garnet, Marquise, VS-SI

8.9 x 4.5 mm

$ 37.73

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1.29ct Violet Amethyst, Emerald Cut, Transparent

8 x 6 mm (calibrated)

$ 9.00

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30.21ctw Red Ruby-Zoisite, Flower Cut, Opaque

16.7 x 15.9 mm

$ 36.07

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15.43ctw White Dendritic Agate, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 12.29

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2.65ct Yellow Citrine, Flower Cut, Transparent

9 x 9 mm (calibrated)

$ 20.33

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14.04ct Multicolor Agate, Round, Opaque

13 mm (calibrated)

$ 11.19

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15.99ct Multicolor Pietersite, Pear Shape, Opaque

26.3 x 17.4 mm

$ 38.55

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48.00ct Multicolor Jasper, Cushion, Opaque

26.8 x 24.9 mm

$ 52.59

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2.37ct Black Star Diopside, Pear Shape, Opaque

10 x 7 mm (calibrated)

$ 11.80

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5.08ct Yellow Citrine, Oval, VVS-VS

14 x 10 mm (calibrated)

$ 30.49

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4.64ctw Yellow Citrine, Square, VVS-VS

8 x 8 mm (calibrated)

$ 35.59

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1.57ct Purple Spinel, Cushion, VVS-VS

7.4 x 6 mm

$ 260.62

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3.96ct Violet Amethyst, Pear Shape, VS

14 x 10 mm (calibrated)

$ 28.77

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0.80ct Green Peridot, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 11.16

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1.40ct Yellow Citrine, Square, VVS-VS

6 x 6 mm (calibrated)

$ 9.76

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45.92ct Multicolor Jasper, Oval, Opaque

31 x 24.9 mm

$ 33.71

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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

Had a great experience and the prices are great

Posted By BuBx99 in November, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Easy to use. Many options to find the right gemstone

Posted By Liz in May, 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 -> 10 star ratings

Easy and functional

Posted By Dessa in March, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

They have literally everything on this website! The prices are also pretty good, I was able to find plenty of nice stones that I could afford!

Posted By JC in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

No problems. I had a minor address issue in the past and someone got back to me very quickly and we resolved the issue satisfactorily. I appreciated the quick, concerned response. So important when buyer/seller are so far apart in distance. Thank you Gem Select. Keep up the good work!

Posted By Orphanboy in December, 2025
Source: Bizrate
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