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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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0.47ct White Rainbow Moonstone, Baguette, Transparent

0.47ct White Rainbow Moonstone, Baguette, Transparent

6 x 4 mm (calibrated)

$ 16.38

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3.71ct Red Almandine Garnet, Heart, VS

3.71ct Red Almandine Garnet, Heart, VS

9.9 x 9.5 mm

$ 107.78

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9.01ct Black Tourmaline, Oval, Opaque

9.01ct Black Tourmaline, Oval, Opaque

14.9 x 12 mm

$ 44.87

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1.92ct Orange Hessonite Garnet, Cushion, VS-SI

1.92ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 28.60

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11.99ct Pink Rose Quartz, Oval, Transparent

11.99ct Pink Rose Quartz, Oval, Transparent

17 x 13.7 mm

$ 65.69

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1.00ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

1.00ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

6.8 x 4.6 mm

$ 30.68

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2.75ct Green Malachite, Oval, Opaque

2.75ct Green Malachite, Oval, Opaque

9.9 x 7.6 mm

$ 2.11

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6.36ct Blue Chalcedony, Cushion, Translucent

6.36ct Blue Chalcedony, Cushion, Translucent

12 x 12 mm (calibrated)

$ 23.75

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46.40ct Multicolor Tiger'S Eye Matrix, Square, Opaque

46.40ct Multicolor Tiger'S Eye Matrix, Square, Opaque

30 x 22 mm (calibrated)

$ 46.21

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3.36ct Violet Amethyst, Pear Shape, VVS

3.36ct Violet Amethyst, Pear Shape, VVS

13 x 9 mm (calibrated)

$ 23.42

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1.32ct Blue Kyanite, Round, SI

1.32ct Blue Kyanite, Round, SI

6.5 mm (calibrated)

$ 32.87

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0.85ct Orange Fire Opal, Oval, Transparent

0.85ct Orange Fire Opal, Oval, Transparent

8 x 6 mm (calibrated)

$ 13.97

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3.96ct Multicolor Opal, Oval, Translucent

3.96ct Multicolor Opal, Oval, Translucent

14.4 x 11.2 mm

$ 98.60

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17.75ct Violet Amethyst, Pear Shape, VVS

17.75ct Violet Amethyst, Pear Shape, VVS

21.2 x 15.9 mm

$ 123.75

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1.37ctw Yellow Citrine, Trillion, VS

1.37ctw Yellow Citrine, Trillion, VS

6 x 6 mm (calibrated)

$ 10.91

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0.88ctw Green Peridot, Pear Shape, VVS-VS

0.88ctw Green Peridot, Pear Shape, VVS-VS

6 x 4 mm (calibrated)

$ 7.71

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7.17ct Yellow Citrine, Round, VVS-VS

7.17ct Yellow Citrine, Round, VVS-VS

13 mm (calibrated)

$ 54.99

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9.96ct Green Maw-Sit-Sit, Pear Shape, Opaque
Maw-Sit-Sit Product Video (473971)

9.96ct Green Maw-Sit-Sit, Pear Shape, Opaque

16.8 x 11 mm

$ 32.74

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2.71ct Violet Amethyst, Trillion, VS

2.71ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 14.85

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7.41ct Multicolor Rainbow Pyrite, Baguette, Opaque

7.41ct Multicolor Rainbow Pyrite, Baguette, Opaque

19.2 x 10 mm

$ 19.11

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0.52ct White Opal, Oval, Transparent

0.52ct White Opal, Oval, Transparent

7.2 x 5.3 mm

$ 12.95

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13.49ct Bi-Color Ametrine, Cushion, VVS

13.49ct Bi-Color Ametrine, Cushion, VVS

17.1 x 12.9 mm

$ 120.92

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3.01ctw Green Tsavorite Garnet, Oval, VS

3.01ctw Green Tsavorite Garnet, Oval, VS

5.2 x 3.1 mm

$ 164.89

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4.50ct Multicolor Fire Agate, Fancy, Opaque

4.50ct Multicolor Fire Agate, Fancy, Opaque

12.2 x 9 mm

$ 38.11

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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. Maybe too great i kept adding and deleting stuff because i found better looking ones

Posted By Edsor works in October, 2025
Source: Bizrate

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

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

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

Overall Rating -> 10 star ratings

I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Very easy to navigate with a great selection.

Posted By Bar181 in August, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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