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Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
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1.26ct Multicolor Opal, Trillion, Transparent

1.26ct Multicolor Opal, Trillion, Transparent

8 x 8 mm (calibrated)

$ 32.21

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0.77ct Orange Hessonite Garnet, Pear Shape, SI

0.77ct Orange Hessonite Garnet, Pear Shape, SI

6.7 x 4.9 mm

$ 16.87

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12.90ct Violet Amethyst, Cushion, VVS

12.90ct Violet Amethyst, Cushion, VVS

18 x 13 mm (calibrated)

$ 102.79

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1.41ct Green Tourmaline, Emerald Cut, VVS-VS

1.41ct Green Tourmaline, Emerald Cut, VVS-VS

19.7 x 3 mm

$ 33.98

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1.26ct Yellow Color-Change Diaspore, Pear Shape, SI

1.26ct Yellow Color-Change Diaspore, Pear Shape, SI

9.2 x 5 mm

$ 67.74

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60.57ct Multicolor Jasper, Oval, Opaque
Jasper Product Video (392239)

60.57ct Multicolor Jasper, Oval, Opaque

35.2 x 23.3 mm

$ 66.37

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4.78ctw White Topaz, Square, VVS-VS

4.78ctw White Topaz, Square, VVS-VS

4.2 x 4.2 mm

$ 38.49

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7.45ctw Black Spinel, Round, Opaque

7.45ctw Black Spinel, Round, Opaque

10 mm (calibrated)

$ 28.58

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4.01ctw Violet Amethyst, Square, VVS-VS

4.01ctw Violet Amethyst, Square, VVS-VS

6 x 6 mm (calibrated)

$ 30.76

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35.03ct Pink Kunzite, Pear Shape, Translucent

35.03ct Pink Kunzite, Pear Shape, Translucent

23.4 x 16.6 mm

$ 104.67

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0.56ctw Blue Kyanite, Round, VS-SI

0.56ctw Blue Kyanite, Round, VS-SI

3.7 mm

$ 10.04

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2.15ctw Pink Tourmaline, Round, Transparent

2.15ctw Pink Tourmaline, Round, Transparent

6 mm (calibrated)

$ 35.64

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2.13ct Green Peridot, Cushion, VS

2.13ct Green Peridot, Cushion, VS

8.4 x 6.6 mm

$ 83.87

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27.03ctw Black Spinel, Fancy, Opaque

27.03ctw Black Spinel, Fancy, Opaque

18.2 x 12 mm

$ 88.84

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24.27ct Multicolor Agate, Round, Opaque

24.27ct Multicolor Agate, Round, Opaque

19 mm (calibrated)

$ 24.17

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18.32ct Multicolor Agate, Oval, Opaque

18.32ct Multicolor Agate, Oval, Opaque

19.2 x 16.2 mm

$ 17.33

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71.36ct Red Star Garnet, Oval, Opaque

71.36ct Red Star Garnet, Oval, Opaque

27 x 21.2 mm

$ 234.55

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45.61ct Multicolor Rhodochrosite, Pear Shape, Translucent

45.61ct Multicolor Rhodochrosite, Pear Shape, Translucent

37.9 x 15.6 mm

$ 77.95

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1.16ct Pink Morganite, Pear Shape, VVS-VS

1.16ct Pink Morganite, Pear Shape, VVS-VS

9.6 x 6 mm

$ 127.09

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2.61ct Orange Moonstone, Cushion, Translucent

2.61ct Orange Moonstone, Cushion, Translucent

9 x 7 mm (calibrated)

$ 5.20

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1.59ct Pink Kunzite, Emerald Cut, VS-SI

1.59ct Pink Kunzite, Emerald Cut, VS-SI

6.2 x 5.6 mm

$ 43.76

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2.37ctw Orange Spessartite Garnet, Oval, VS-SI

2.37ctw Orange Spessartite Garnet, Oval, VS-SI

5 x 3.3 mm

$ 80.49

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2.78ct Violet Amethyst, Trillion, VVS

2.78ct Violet Amethyst, Trillion, VVS

10 x 10 mm (calibrated)

$ 19.38

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6.40ctw Multicolor Pietersite, Pear Shape, Opaque

6.40ctw Multicolor Pietersite, Pear Shape, Opaque

15.5 x 10.7 mm

$ 15.68

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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's mostly good, only some item's are easier to find through the search than the menu

Posted By Wayne in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.

Posted By Fried Rice in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The citrine gems are beautiful. I appreciated that each stone was individually shown on the website so I could see exactly what I was getting. No mystery person selecting random stones for me. The documentation included with each gem was high quality as well. Great price and arrived as expected.

Posted By Jen in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I can pick and choose from large selection and find just what I need for .y projects, currently my cane.

Posted By Darkstar731 in July, 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

Great! Affordable

Posted By Spinellope in April, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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