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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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Untreated Gemstones Treatment

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0.08ctw Black Diamond, Round, Opaque

2 mm (calibrated)

$ 63.74

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4.48ctw Multicolor Spectrolite, Oval, Opaque

10 x 8 mm (calibrated)

$ 20.48

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2.12ctw Multicolor Andalusite, Oval, VS

6 x 4 mm (calibrated)

$ 113.68

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1.74ct Yellow Beryl, Round, VVS

8 mm (calibrated)

$ 34.66

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2.05ct Orange Moonstone, Cushion, Translucent

9 x 7 mm (calibrated)

$ 4.08

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9.75ct Multicolor Fire Agate, Fancy, Opaque

17.1 x 13.8 mm

$ 76.48

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2.53ctw White Sillimanite Cat'S Eye, Oval, Translucent

7 x 5 mm (calibrated)

$ 10.04

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0.70ct Yellow Color-Change Diaspore, Square, VS

5.3 x 5.2 mm

$ 26.00

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0.74ct Green Peridot, Oval, VS

7 x 5 mm (calibrated)

$ 5.16

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5.24ct Green Chrysoberyl Cat'S Eye, Oval, Opaque

11.7 x 8.9 mm

$ 4,784.12

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10.93ct Multicolor Bloodstone, Oval, Opaque

14 x 12 mm (calibrated)

$ 24.78

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1.04ct Yellow Color-Change Diaspore, Cushion, VVS-VS

7 x 5 mm (calibrated)

$ 46.75

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3.36ct Multicolor Labradorite, Baguette, Translucent

9 x 7 mm (calibrated)

$ 4.62

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1.45ct Multicolor Labradorite, Marquise, Translucent

10 x 5 mm (calibrated)

$ 3.20

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2.21ct Blue Spinel, Emerald Cut, VVS

8.4 x 5.9 mm

$ 2,751.45

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13.84ct Purple Ruby-Zoisite, Flower Cut, Opaque

15 x 15 mm (calibrated)

$ 16.53

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10.60ct Multicolor Labradorite, Baguette, Translucent

16 x 12 mm (calibrated)

$ 13.59

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0.66ct Orange Citrine, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 6.57

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3.49ct White Topaz, Round, VS-SI

8.5 mm (calibrated)

$ 22.94

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1.23ct Multicolor Opal, Pear Shape, Transparent

10 x 7 mm (calibrated)

$ 30.63

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2.00ct Multicolor Spectrolite, Oval, Opaque

10 x 8 mm (calibrated)

$ 9.15

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22.84ct Gray Hematite, Heart, Opaque

20.3 x 19.1 mm

$ 50.05

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1.02ct Blue Kyanite, Oval, VS-SI

7 x 5 mm (calibrated)

$ 20.32

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1.71ct Purple Spinel, Cushion, VS

6.7 x 5.7 mm

$ 110.71

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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

Very good place to buy gemstones

Posted By Elansary in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

A pleasant experience and many choices to choose from

Posted By Krackenking in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.

Posted By Atsuhisa in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I have shopped at Gemselect for nearly 20 years. I especially like that you see pictures of the exact gem you are purchasing. You are a trusted source.

Posted By DNaber in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Easy and good price

Posted By Bry_guy in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

It's always a pleasure doing business with Gem Select. Outstanding products ant very reasonable prices. Thank You One and All.

Posted By G.W. or Bakyow in July, 2025
Source: Bizrate
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