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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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44.60ct Violet Amethyst, Oval, VVS

24.8 x 19.7 mm

$ 296.14

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13.03ct Blue Chalcedony, Pear Shape, Opaque

26 x 13.7 mm

$ 27.04

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4.06ct Orange Sunstone, Round, Translucent

11 mm (calibrated)

$ 37.07

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0.11ct Black Diamond, Square, Opaque

2.4 x 2.3 mm

$ 46.29

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87.88ctw Gray Hematite, Cushion, Opaque

23.4 x 19.5 mm

$ 85.69

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52.11ct Multicolor Jasper, Oval, Translucent

37.9 x 28.4 mm

$ 51.90

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6.13ct Violet Amethyst, Marquise, VS

17.6 x 9.1 mm

$ 39.18

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37.39ct Multicolor Jasper, Oval, Opaque

35.4 x 25.7 mm

$ 22.53

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33.38ctw Multicolor Fossil Coral, Cushion, Opaque

20.6 x 13.8 mm

$ 35.96

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14.20ctw Green Prehnite, Fancy, Transparent

18.4 x 12 mm

$ 22.25

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1.42ct White Sillimanite Cat'S Eye, Oval, Transparent

6.5 x 6.4 mm

$ 5.66

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4.17ct White Morganite, Oval, Transparent

14.3 x 10.4 mm

$ 47.92

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0.49ct Green Demantoid Garnet, Oval, VS-SI

5.1 x 4.1 mm

$ 134.21

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15.88ct Multicolor Boulder Opal, Cushion, Opaque

23.1 x 12.2 mm

$ 110.71

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83.49ct Multicolor Agate, Square, Opaque

27.9 x 27.7 mm

$ 29.10

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9.89ct Green Tsavorite Garnet, Pear Shape, Translucent

17.3 x 11.2 mm

$ 216.71

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83.06ct Pink Rose Quartz, Pear Shape, Transparent

32.6 x 24.9 mm

$ 182.00

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6.54ct Green Apatite, Emerald Cut, VS

11 x 11 mm (calibrated)

$ 343.22

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5.00ctw Orange Hessonite Garnet, Emerald Cut, VS

7 x 5 mm (calibrated)

$ 110.00

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2.98ct Red Zircon, Pear Shape, VVS-VS

10 x 7 mm (calibrated)

$ 125.24

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21.19ct Green Druzy Variscite, Fancy, Opaque

33.4 x 16.6 mm

$ 89.91

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30.85ct Multicolor Labradorite, Round, Translucent

25.2 mm

$ 40.22

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35.68ct Black Snowflake Obsidian, Fancy, Opaque

26.4 x 24.5 mm

$ 20.97

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12.25ct Green Tourmaline, Oval, VVS-VS

15.7 x 12.8 mm

$ 2,033.50

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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 -> 9 star ratings

The website was easy to use and informative of the selection of stones it has. I quickly found the right stone for me.

Posted By Guero in March, 2026
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I was able to find what I've been looking for.

Posted By Tree Dog in April, 2026
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Overall Rating -> 10 star ratings

My experience was done with ease

Posted By Barb in October, 2025
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Overall Rating -> 10 star ratings

Recomendado Totalmente Los Productos Se Entregaron A Tiempo

Posted By Alexis in May, 2026
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Overall Rating -> 10 star ratings

easy site to navigate

Posted By Curt's Cabochons in June, 2025
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Overall Rating -> 10 star ratings

I love the product and the details about each of them.

Posted By Love It! in July, 2025
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