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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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7.37ctw Black Spinel, Round, Opaque

7.37ctw Black Spinel, Round, Opaque

9 mm (calibrated)

$ 24.22

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2.96ctw Violet Amethyst, Trillion, VS

2.96ctw Violet Amethyst, Trillion, VS

7 x 6.1 mm

$ 19.46

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2.90ct Red Almandine Garnet, Pear Shape, VVS-VS

2.90ct Red Almandine Garnet, Pear Shape, VVS-VS

12 x 8 mm (calibrated)

$ 24.07

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94.83ct Multicolor Jasper, Oval, Opaque

94.83ct Multicolor Jasper, Oval, Opaque

40.7 x 32.9 mm

$ 48.84

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3.65ct White Topaz, Round, VVS-VS

3.65ct White Topaz, Round, VVS-VS

9.5 mm (calibrated)

$ 32.11

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3.94ctw Violet Amethyst, Oval, VVS-VS

3.94ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 21.58

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3.07ctw Yellow Sphene, Oval, Transparent

3.07ctw Yellow Sphene, Oval, Transparent

6.4 x 6.2 mm

$ 15.29

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4.75ctw Green Prehnite, Oval, Transparent/Translucent

4.75ctw Green Prehnite, Oval, Transparent/Translucent

9 x 7 mm (calibrated)

$ 11.70

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0.79ct Yellow Morganite, Pear Shape, VS

0.79ct Yellow Morganite, Pear Shape, VS

8 x 6 mm (calibrated)

$ 43.28

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4.78ctw White Topaz, Cushion, VVS-VS

4.78ctw White Topaz, Cushion, VVS-VS

4.6 x 4.5 mm

$ 26.19

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1.62ct Purple Rhodolite Garnet, Oval, VS

1.62ct Purple Rhodolite Garnet, Oval, VS

8 x 6 mm (calibrated)

$ 66.45

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0.18ct Pink Morganite, Round, VVS-VS

0.18ct Pink Morganite, Round, VVS-VS

4.2 mm

$ 7.47

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0.79ct Purple Spinel, Cushion, VS

0.79ct Purple Spinel, Cushion, VS

5.5 x 4.3 mm

$ 65.57

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16.40ct Multicolor Quartz With Marcasite, Oval, Transparent

16.40ct Multicolor Quartz With Marcasite, Oval, Transparent

21.8 x 13.7 mm

$ 107.81

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1.22ct Purple Sapphire, Cushion, VS-SI
Sapphire Product Video (447796)

1.22ct Purple Sapphire, Cushion, VS-SI

6.2 x 5.1 mm

$ 643.37

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1.29ct Multicolor Opal, Pear Shape, Transparent

1.29ct Multicolor Opal, Pear Shape, Transparent

11.8 x 7 mm

$ 49.47

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0.90ct Green Peridot, Oval, VVS-VS

0.90ct Green Peridot, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 6.27

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44.95ctw Brown Smoky Quartz, Sphere / Ball, Transparent

44.95ctw Brown Smoky Quartz, Sphere / Ball, Transparent

10 mm (calibrated)

$ 71.41

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21.16ct Red Star Garnet, Oval, Opaque

21.16ct Red Star Garnet, Oval, Opaque

18 x 14 mm

$ 20.87

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0.91ct Green Tourmaline, Emerald Cut, VS

0.91ct Green Tourmaline, Emerald Cut, VS

10.3 x 3.8 mm

$ 24.82

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36.16ct Multicolor Obsidian, Cushion, Opaque

36.16ct Multicolor Obsidian, Cushion, Opaque

31.5 x 22.1 mm

$ 30.49

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0.68ct Green Peridot, Pear Shape, VS

0.68ct Green Peridot, Pear Shape, VS

6.5 x 4.8 mm

$ 4.74

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1.52ct Green Tourmaline, Emerald Cut, VS

1.52ct Green Tourmaline, Emerald Cut, VS

13.5 x 3.9 mm

$ 41.47

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8.18ct Multicolor Pietersite, Pear Shape, Opaque

8.18ct Multicolor Pietersite, Pear Shape, Opaque

24.8 x 14.2 mm

$ 27.16

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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 -> 9 star ratings

Plan on purchasing on an ongoing basis. So far.....so good....

Posted By Jim in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
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

Love beauty, color, quality, and price of these gems. Personal projects and will come here soon and everytime.

Posted By Darkstar in June, 2025
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

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

Posted By Blas in January, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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