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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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Yellow Untreated Gemstones
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64.77ct Multicolor Jasper, Oval, Opaque

64.77ct Multicolor Jasper, Oval, Opaque

45.8 x 27.8 mm

$ 26.62

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22.53ct Brown Tiger'S Eye, Fancy, Opaque

22.53ct Brown Tiger'S Eye, Fancy, Opaque

33.2 x 9.2 mm

$ 6.73

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2.31ct Red Tourmaline, Oval, Transparent

2.31ct Red Tourmaline, Oval, Transparent

9 x 7 mm (calibrated)

$ 33.00

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1.24ct Yellow Sphalerite, Round, SI-I1

1.24ct Yellow Sphalerite, Round, SI-I1

6 mm (calibrated)

$ 61.75

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23.41ct Green Cat'S Eye Aquamarine, Oval, Translucent
Cat's Eye Aquamarine Product Video (363233)

23.41ct Green Cat'S Eye Aquamarine, Oval, Translucent

17.3 x 14.6 mm

$ 396.37

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0.85ct Yellow Color-Change Diaspore, Cushion, VS

0.85ct Yellow Color-Change Diaspore, Cushion, VS

7 x 5 mm (calibrated)

$ 44.87

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8.33ct Pink Strawberry Quartz, Oval, Translucent

8.33ct Pink Strawberry Quartz, Oval, Translucent

16 x 12 mm (calibrated)

$ 52.38

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18.45ctw Brown Tiger'S Eye, Cushion, Opaque

18.45ctw Brown Tiger'S Eye, Cushion, Opaque

14 x 12 mm (calibrated)

$ 20.22

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5.46ct Violet Amethyst, Round, Transparent

5.46ct Violet Amethyst, Round, Transparent

12 mm (calibrated)

$ 38.06

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21.16ct Multicolor Peanut Wood, Pear Shape, Opaque

21.16ct Multicolor Peanut Wood, Pear Shape, Opaque

28.9 x 19.3 mm

$ 12.65

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7.70ctw Violet Amethyst, Oval, Transparent

7.70ctw Violet Amethyst, Oval, Transparent

11 x 9 mm (calibrated)

$ 42.18

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1.20ct Orange Hessonite Garnet, Pear Shape, SI

1.20ct Orange Hessonite Garnet, Pear Shape, SI

8 x 5.7 mm

$ 26.29

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0.67ct Yellow Sphalerite, Round, SI-I1

0.67ct Yellow Sphalerite, Round, SI-I1

4.5 mm (calibrated)

$ 33.37

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12.15ctw Green Aventurine, Pear Shape, Translucent

12.15ctw Green Aventurine, Pear Shape, Translucent

17 x 11.1 mm

$ 26.63

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2.44ct Brown Tiger'S Eye, Round, Opaque

2.44ct Brown Tiger'S Eye, Round, Opaque

8 mm (calibrated)

$ 2.03

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19.30ct Violet Amethyst, Emerald Cut, VVS

19.30ct Violet Amethyst, Emerald Cut, VVS

20 x 15 mm (calibrated)

$ 153.78

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2.77ctw Yellow Tourmaline, Oval, VS
Tourmaline Product Video (701516)

2.77ctw Yellow Tourmaline, Oval, VS

8 x 6 mm (calibrated)

$ 110.36

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4.08ctw Orange Hessonite Garnet, Square, VS-SI
Hessonite Garnet Product Video (392989)

4.08ctw Orange Hessonite Garnet, Square, VS-SI

7 x 7 mm (calibrated)

$ 89.40

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1.06ct Orange Hessonite Garnet, Round, VS

1.06ct Orange Hessonite Garnet, Round, VS

6 mm (calibrated)

$ 18.51

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2.15ct Orange Hessonite Garnet, Emerald Cut, VS

2.15ct Orange Hessonite Garnet, Emerald Cut, VS

8 x 6 mm (calibrated)

$ 35.91

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13.10ctw Green Amazonite, Round, Opaque

13.10ctw Green Amazonite, Round, Opaque

9 mm (calibrated)

$ 10.44

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3.65ctw Orange Hessonite Garnet, Square, VS

3.65ctw Orange Hessonite Garnet, Square, VS

6.7 x 6.7 mm

$ 79.98

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1.19ct Yellow Sphene, Round, VS-SI
Sphene Product Video (526305)

1.19ct Yellow Sphene, Round, VS-SI

6.5 mm (calibrated)

$ 71.71

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6.16ct Turquoise Fluorite, Round, Transparent

6.16ct Turquoise Fluorite, Round, Transparent

10.4 mm

$ 24.54

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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

GemSelect offers excellent choices, prices & service- highly recommended! Unfortunately, prior to ordering a replacement gemstone, my jeweler neglected to mention it needed to be one that was a'cushion cuta' to fit the existing mount. Have yet to return/exchangea'

Posted By CJ in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Over pretty well experience the your website no complaints about it very easy reliable service provided

Posted By Blas in January, 2026
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Overall Rating -> 10 star ratings

Easy process.

Posted By Crafty Seabee in March, 2026
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Overall Rating -> 10 star ratings

My whole experience is great.

Posted By Ghs in November, 2025
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Overall Rating -> 10 star ratings

Recomendado Totalmente Los Productos Se Entregaron A Tiempo

Posted By Alexis in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Absolutely love Gem Select. I always know the quality and accuracy of information and photos are top notch. Highly recommend!

Posted By Matthew K. in May, 2026
Source: Bizrate
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