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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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Untreated Gemstones Treatment

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2.85ct Pink Tourmaline, Cushion, Transparent

2.85ct Pink Tourmaline, Cushion, Transparent

9.1 x 7.8 mm

$ 33.50

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2.96ctw Brown Rutile Quartz, Round, Transparent

2.96ctw Brown Rutile Quartz, Round, Transparent

7 mm (calibrated)

$ 9.73

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0.56ct Pink Spinel, Round, VVS-VS

0.56ct Pink Spinel, Round, VVS-VS

5 mm (calibrated)

$ 41.83

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4.82ct Multicolor Fire Agate, Fancy, Opaque

4.82ct Multicolor Fire Agate, Fancy, Opaque

10.4 x 10 mm

$ 34.23

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13.02ctw Black Spinel, Heart, Opaque

13.02ctw Black Spinel, Heart, Opaque

12 x 12 mm (calibrated)

$ 64.84

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0.90ct Green Tourmaline, Emerald Cut, VVS

0.90ct Green Tourmaline, Emerald Cut, VVS

5.3 x 5 mm

$ 44.82

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1.56ct Multicolor Opal, Oval, Transparent

1.56ct Multicolor Opal, Oval, Transparent

10 x 8 mm (calibrated)

$ 76.91

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1.99ct Brown Tiger'S Eye, Pear Shape, Opaque

1.99ct Brown Tiger'S Eye, Pear Shape, Opaque

10 x 7 mm (calibrated)

$ 1.98

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1.36ct Pink Morganite, Pear Shape, VS

1.36ct Pink Morganite, Pear Shape, VS

8 x 6 mm (calibrated)

$ 104.30

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6.01ct Black Star Diopside, Oval, Opaque

6.01ct Black Star Diopside, Oval, Opaque

12 x 10 mm (calibrated)

$ 29.93

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38.23ct Red Strawberry Quartz, Fancy, Opaque

38.23ct Red Strawberry Quartz, Fancy, Opaque

39.4 x 11.6 mm

$ 3.80

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1.17ct Multicolor Pietersite, Pear Shape, Opaque

1.17ct Multicolor Pietersite, Pear Shape, Opaque

11.1 x 5.9 mm

$ 2.83

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4.28ctw Pink Rose Quartz, Emerald Cut, Transparent

4.28ctw Pink Rose Quartz, Emerald Cut, Transparent

8.5 x 8.5 mm

$ 23.45

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0.80ct Yellow Beryl, Oval, VVS

0.80ct Yellow Beryl, Oval, VVS

7.8 x 5.7 mm

$ 15.94

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0.95ct Yellow Beryl, Oval, VVS

0.95ct Yellow Beryl, Oval, VVS

8 x 6 mm (calibrated)

$ 18.14

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5.15ct Multicolor Rainbow Pyrite, Fancy, Opaque

5.15ct Multicolor Rainbow Pyrite, Fancy, Opaque

18.3 x 12.4 mm

$ 13.34

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44.98ct Multicolor Jasper, Pear Shape, Opaque

44.98ct Multicolor Jasper, Pear Shape, Opaque

44.3 x 24 mm

$ 49.29

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7.36ct Multicolor Agate, Oval, Opaque

7.36ct Multicolor Agate, Oval, Opaque

12.3 x 11.1 mm

$ 6.96

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2.88ct Violet Amethyst, Trillion, VS

2.88ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 15.78

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27.58ct Gray Hematite, Square, Opaque

27.58ct Gray Hematite, Square, Opaque

16 x 16 mm (calibrated)

$ 27.80

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1.29ct Multicolor Opal, Pear Shape, Transparent

1.29ct Multicolor Opal, Pear Shape, Transparent

12.2 x 7.4 mm

$ 60.77

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19.00ct White Rainbow Moonstone, Pear Shape, Transparent

19.00ct White Rainbow Moonstone, Pear Shape, Transparent

22.9 x 14.8 mm

$ 151.39

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2.45ct Brown Smoky Quartz, Oval, VVS-VS

2.45ct Brown Smoky Quartz, Oval, VVS-VS

10 x 8 mm (calibrated)

$ 14.64

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25.46ct Yellow Obsidian, Cushion, Opaque

25.46ct Yellow Obsidian, Cushion, Opaque

27.1 x 18.9 mm

$ 27.90

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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

IT WAS GREAT SIMPLE I WAS ABLE TO MAKE AN ACCOUNT EASY AND WAS ABLE TO FAVORITE ALL OF MY FINAL SELECTED GEMS, I JUST LOVE IT.

Posted By YE in October, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

They have literally everything on this website! The prices are also pretty good, I was able to find plenty of nice stones that I could afford!

Posted By JC in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I love the ability to choose from many options of shapes, gemstone type, color, and so forth. It is fun!

Posted By Geof in November, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Very good and simple exchange

Posted By Waylon in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I liked the selection of gems, and price. I did not like your PayPal process. I already have a PP account and you want me to sign up for another.

Posted By CLTCJH in May, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

I did not realize these stones were of jewelry quality. They are really beautiful, just not what I was expecting which was more of a natural stone.

Posted By Jewelry Quality Stones in July, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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