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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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Bi-color Untreated Gemstones
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Yellow Untreated Gemstones
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31.30ct Red Ruby-Zoisite, Flower Cut, Opaque

31.30ct Red Ruby-Zoisite, Flower Cut, Opaque

21.9 x 16.7 mm

$ 37.38

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14.58ct Multicolor Labradorite, Oval, Translucent

14.58ct Multicolor Labradorite, Oval, Translucent

18 x 13 mm (calibrated)

$ 31.96

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0.43ct Blue Kyanite, Round, VS-SI

0.43ct Blue Kyanite, Round, VS-SI

4.3 mm

$ 10.71

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23.76ctw Multicolor Fossil Coral, Cushion, Opaque

23.76ctw Multicolor Fossil Coral, Cushion, Opaque

18.1 x 12.1 mm

$ 29.68

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3.73ct Yellow Citrine, Oval, VVS-VS

3.73ct Yellow Citrine, Oval, VVS-VS

12 x 10 mm (calibrated)

$ 28.60

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14.10ct White Rainbow Moonstone, Oval, Translucent

14.10ct White Rainbow Moonstone, Oval, Translucent

18.4 x 11.7 mm

$ 14.04

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73.18ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

73.18ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

33.8 x 24.5 mm

$ 42.27

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15.13ct Black Obsidian, Fancy, Opaque

15.13ct Black Obsidian, Fancy, Opaque

24.5 x 13.9 mm

$ 24.87

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6.52ct Multicolor Fire Agate, Fancy, Opaque
Fire Agate Product Video (683503)

6.52ct Multicolor Fire Agate, Fancy, Opaque

16.8 x 11.4 mm

$ 50.13

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3.25ct Brown Moonstone, Flower Cut, Translucent

3.25ct Brown Moonstone, Flower Cut, Translucent

10 x 10 mm (calibrated)

$ 14.24

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2.28ct Brown Hessonite Garnet, Oval, VS-SI

2.28ct Brown Hessonite Garnet, Oval, VS-SI

9 x 7 mm (calibrated)

$ 41.62

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0.05ct Black Diamond, Round, Opaque

0.05ct Black Diamond, Round, Opaque

2.1 mm (calibrated)

$ 14.53

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1.39ct Pink Tourmaline, Emerald Cut, VS

1.39ct Pink Tourmaline, Emerald Cut, VS

6.6 x 5.6 mm

$ 100.50

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1.18ct Yellow Citrine, Emerald Cut, VS

1.18ct Yellow Citrine, Emerald Cut, VS

7.8 x 5.7 mm

$ 9.40

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5.19ct Yellow Rutile Quartz, Oval, Transparent

5.19ct Yellow Rutile Quartz, Oval, Transparent

13 x 9 mm (calibrated)

$ 14.23

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0.51ct Blue Kyanite, Round, SI

0.51ct Blue Kyanite, Round, SI

4.5 mm (calibrated)

$ 12.70

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2.19ct Orange Hessonite Garnet, Cushion, VS-SI

2.19ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 37.31

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13.78ct Violet Amethyst, Cushion, VVS

13.78ct Violet Amethyst, Cushion, VVS

15 x 15 mm (calibrated)

$ 96.07

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66.10ct Violet Amethyst, Pear Shape, VVS-VS
Amethyst Product Video (724432)

66.10ct Violet Amethyst, Pear Shape, VVS-VS

33 x 24.3 mm

$ 495.08

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14.23ct Red Star Garnet, Oval, Opaque

14.23ct Red Star Garnet, Oval, Opaque

11.3 x 11.6 mm

$ 14.74

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3.16ctw Violet Amethyst, Marquise, Transparent

3.16ctw Violet Amethyst, Marquise, Transparent

12 x 6 mm (calibrated)

$ 22.03

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5.52ctw Pink Strawberry Quartz, Round, Translucent

5.52ctw Pink Strawberry Quartz, Round, Translucent

9 mm (calibrated)

$ 34.17

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44.74ctw Multicolor Jasper, Oval, Opaque

44.74ctw Multicolor Jasper, Oval, Opaque

32.1 x 14.6 mm

$ 44.56

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0.44ct Yellow Sphalerite, Round, SI

0.44ct Yellow Sphalerite, Round, SI

4.3 mm

$ 21.91

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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

Found a rock that met my need. Bought it!

Posted By Skot in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

My current project is something BLUE . Opal earrings with matching tennis bracelet for her wedding. The opals and sixty two sapphires VVS & VS are AMAZINGLY BEAUTIFUL. The private jewelers were impressed by the clarity and inclusion free of the sapphires . I want to say thank you for the High quality sapphires that I purchased for my daughtera's wedding.

Posted By My real name Dean or Wandering about in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Easy to use. No issues. Large selection of gems.

Posted By CLTCJH in February, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

It was a good interaction I got a good gemstone for cheap

Posted By Jon in December, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

I loved the selection of gemstones you have a to z

Posted By James in May, 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
→ View All GemSelect Reviews on Bizrate
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