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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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0.44ct Blue Kyanite, Round, SI

4 mm (calibrated)

$ 10.96

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0.69ctw Green Peridot, Pear Shape, VVS-VS

6 x 4 mm (calibrated)

$ 6.04

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1.62ct Orange Hessonite Garnet, Oval, VS

7.9 x 6.6 mm

$ 28.59

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0.77ct Purple Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 20.45

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98.18ct Brown Tiger'S Eye, Square, Opaque

28.1 x 27.9 mm

$ 57.05

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2.05ct Red Strawberry Quartz, Oval, Transparent

9 x 7 mm (calibrated)

$ 15.83

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19.10ct Brown Tiger'S Eye, Fancy, Opaque

31.6 x 8.9 mm

$ 10.47

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2.32ct Pink Tourmaline, Emerald Cut, VS-SI

9 x 6 mm (calibrated)

$ 146.15

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5.41ct Green Actinolite Cat'S Eye, Oval, Translucent

14 x 12 mm (calibrated)

$ 37.72

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33.70ct Multicolor Chrysocolla, Cushion, Opaque

21.8 x 21.2 mm

$ 55.39

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4.34ct Violet Amethyst, Pear Shape, VVS

15 x 10 mm (calibrated)

$ 31.52

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2.61ctw White Topaz, Cushion, VVS-VS

4.6 x 4.6 mm

$ 14.30

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2.22ct Yellow Sphene, Oval, Transparent

7.9 x 7 mm

$ 11.06

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7.80ctw Green Prehnite, Oval, Transparent

8.1 x 6.6 mm

$ 42.73

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0.56ct Blue Spinel, Round, VS

5 mm (calibrated)

$ 41.83

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0.80ct Multicolor Labradorite, Pear Shape, Translucent

6.2 x 4.2 mm

$ 1.78

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0.89ct Blue Kyanite, Oval, VS-SI

7 x 5 mm (calibrated)

$ 19.51

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12.12ct Green Maw-Sit-Sit, Oval, Opaque

15.2 x 12.8 mm

$ 39.84

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0.91ct Yellow Color-Change Diaspore, Square, VVS-VS

5.8 x 5.6 mm

$ 47.55

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25.09ct Multicolor Pietersite, Pear Shape, Opaque

26.7 x 26.4 mm

$ 74.97

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2.70ct Multicolor Labradorite, Pear Shape, Translucent

10 x 7 mm (calibrated)

$ 5.97

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1.95ct Pink Morganite, Round, VS

8 mm (calibrated)

$ 106.82

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73.83ct Pink Star Rose Quartz, Oval, Transparent

24.6 x 23.1 mm

$ 121.35

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3.72ct Violet Amethyst, Pear Shape, VVS-VS

13 x 9 mm (calibrated)

$ 28.53

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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

All items were delivered on time with all items meeting or exceeding my expectations. Cut, clarity and color were very close to the photos and description.

Posted By Bob D in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great! Affordable

Posted By Spinellope in April, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Nothing bad to report. Everything is as expected. The gems and the price are all very good.

Posted By Dafanatic in August, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

I think therea's no problem

Posted By Napoleon in August, 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
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