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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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5.80ct Brown Hessonite Garnet, Oval, Translucent

12 x 8 mm (calibrated)

$ 31.77

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17.81ct Pink Rose Quartz, Oval, Transparent

17.7 x 15.3 mm

$ 39.03

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1.69ct Orange Hessonite Garnet, Cushion, VS

7 x 7 mm (calibrated)

$ 28.42

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1.44ct White Sillimanite Cat'S Eye, Round, Transparent

6.5 mm (calibrated)

$ 4.49

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1.94ct Yellow Citrine, Cushion, VS-SI

9.5 x 7.1 mm

$ 14.88

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60.34ctw Gray Hematite, Pear Shape, Opaque

24.3 x 16.8 mm

$ 58.83

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0.87ctw Green Peridot, Pear Shape, VVS-VS

6 x 4 mm (calibrated)

$ 7.63

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0.09ct Black Diamond, Square, Opaque

2.2 x 2.1 mm

$ 35.97

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5.56ctw Violet Amethyst, Oval, Transparent

10 x 8 mm (calibrated)

$ 30.46

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2.74ct Yellow Rutile Topaz, Oval, Transparent

10.4 x 7.5 mm

$ 56.86

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1.56ct Blue Kyanite, Oval, VS-SI

8 x 6 mm (calibrated)

$ 34.18

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2.06ctw Green Demantoid Garnet, Oval, VS

4.4 x 3.5 mm

$ 225.69

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7.26ctw Black Spinel, Round, Opaque

9 mm (calibrated)

$ 23.86

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0.96ct Green Peridot, Oval, VS

7 x 5 mm (calibrated)

$ 6.69

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0.74ct Yellow Color-Change Garnet, Emerald Cut, VVS-VS

7 x 3.5 mm

$ 76.61

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98.71ct Green Agate, Square, Opaque

28.9 x 28.3 mm

$ 34.41

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1.10ct Multicolor Opal, Oval, Transparent

9 x 7 mm (calibrated)

$ 49.30

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7.87ct Violet Amethyst, Cushion, VVS-VS

18.2 x 9.1 mm

$ 47.03

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3.44ctw Orange Moonstone, Oval, Translucent

8 x 6 mm (calibrated)

$ 6.88

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3.60ctw Red Pyrope Garnet, Marquise, VVS-VS

12.2 x 6 mm

$ 63.10

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2.80ctw Multicolor Andalusite, Oval, VS

6.3 x 4.3 mm

$ 150.13

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37.30ct Gray Hematite, Oval, Opaque

24.3 x 18.9 mm

$ 36.37

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1.55ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 13.56

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2.19ct Yellow Citrine, Flower Cut, Transparent

8.1 x 7.5 mm

$ 15.27

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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

Great selection of gems at a reasonable price

Posted By Curt in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I have a beautiful emerald I purchased from a company names gemselect and they are awesome! You should try them out?

Posted By Lynn in September, 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 -> 9 star ratings

Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly

Posted By Ron T in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Good, hope gem quality is good and genuine

Posted By Varun in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

The website was very easy to use.

Posted By Garnet in January, 2026
Source: Bizrate
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