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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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26.39ct Violet Amethyst, Oval, VVS

22.7 x 14.4 mm

$ 202.39

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2.60ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 18.13

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1.51ct Orange Hessonite Garnet, Baguette, VS-SI

7.5 x 4.8 mm

$ 33.08

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1.78ct Multicolor Opal, Oval, Transparent

10.8 x 8.1 mm

$ 44.32

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4.67ct Green Prehnite, Fancy, Translucent

14 x 9.7 mm

$ 7.67

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2.52ct Green Peridot, Cushion, VS

9 x 7 mm (calibrated)

$ 98.84

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16.34ct Violet Amethyst, Cushion, VVS

20 x 15 mm (calibrated)

$ 113.93

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7.15ct Pink Strawberry Quartz, Oval, Translucent

12.5 x 10.5 mm

$ 43.09

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1.95ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 33.22

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10.67ct Turquoise Larimar, Oval, Opaque

18 x 13 mm (calibrated)

$ 127.40

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3.05ct Yellow Citrine, Oval, VVS-VS

10 x 8 mm (calibrated)

$ 16.72

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22.61ct Brown Jasper, Fancy, Opaque

40.4 x 12.4 mm

$ 34.68

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4.46ctw Purple Rhodolite Garnet, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 94.85

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27.10ct Orange Moonstone, Oval, Opaque

22.2 x 16.1 mm

$ 40.49

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37.59ct Multicolor Jasper, Pear Shape, Opaque

35.8 x 22.4 mm

$ 26.36

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41.69ct Green Idocrase, Cushion, Opaque

32.2 x 23.7 mm

$ 20.77

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12.53ctw Brown Tiger'S Eye, Baguette, Opaque

12 x 10 mm (calibrated)

$ 12.48

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0.31ct Yellow Diamond, Round, VS

4.2 mm

$ 565.94

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0.52ct Pink Spinel, Cushion, VVS-VS

5.3 x 4.9 mm

$ 43.16

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37.21ct Green Amazonite, Fancy, Opaque

42.1 x 10.8 mm

$ 7.41

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8.44ct Brown Smoky Quartz, Round, VS

14 mm (calibrated)

$ 34.03

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18.25ct Violet Amethyst, Cushion, VVS

20 x 15 mm (calibrated)

$ 127.24

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20.89ctw Multicolor Jasper, Sphere / Ball, Opaque

12 mm (calibrated)

$ 22.89

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1.96ct Green Prehnite, Oval, Transparent/Translucent

7.7 x 6.8 mm

$ 12.64

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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

Wonderful purchase, can't wait to see the stone.

Posted By Tim in January, 2026
Source: Bizrate

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

I always purchase my stones from GemSelect, their products are high quality and customer service is always great. I also like the fact that I am able to purchase unique items

Posted By Desperaux in November, 2025
Source: Bizrate

Overall Rating -> 7 star ratings

easy interface for a pricless buy

Posted By Zeak in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Would have bought an indigo and selenite, but neither listed. But, you do offer quite a large assortment otherwise.

Posted By JD in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Filters need to be improved but rest of website is great

Posted By Rock hound in December, 2025
Source: Bizrate
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