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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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31.63ct Green Tourmaline, Flower Cut, Transparent
Tourmaline Product Video (691213)

31.63ct Green Tourmaline, Flower Cut, Transparent

23.4 x 19 mm

$ 616.52

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1.60ct Pink Tourmaline, Oval, Transparent

1.60ct Pink Tourmaline, Oval, Transparent

7.9 x 6.3 mm

$ 47.81

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1.32ct Orange Hessonite Garnet, Baguette, SI

1.32ct Orange Hessonite Garnet, Baguette, SI

7 x 5 mm (calibrated)

$ 28.93

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0.66ct Yellow Citrine, Pear Shape, VVS-VS

0.66ct Yellow Citrine, Pear Shape, VVS-VS

7 x 5 mm (calibrated)

$ 3.29

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6.60ctw Pink Rose Quartz, Emerald Cut, Transparent

6.60ctw Pink Rose Quartz, Emerald Cut, Transparent

9 x 9 mm (calibrated)

$ 36.15

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26.25ct Multicolor Jasper, Oval, Opaque

26.25ct Multicolor Jasper, Oval, Opaque

33.6 x 21.4 mm

$ 21.57

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9.73ct Multicolor Boulder Opal, Fancy, Opaque

9.73ct Multicolor Boulder Opal, Fancy, Opaque

16 x 12 mm (calibrated)

$ 48.46

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41.12ctw Multicolor Jasper, Marquise, Opaque

41.12ctw Multicolor Jasper, Marquise, Opaque

35.5 x 14.7 mm

$ 40.95

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7.78ctw White Dendritic Agate, Pear Shape, Opaque

7.78ctw White Dendritic Agate, Pear Shape, Opaque

14 x 10 mm (calibrated)

$ 6.19

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2.81ct Pink Tourmaline, Emerald Cut, VS-SI

2.81ct Pink Tourmaline, Emerald Cut, VS-SI

11.1 x 6.5 mm

$ 193.12

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2.60ctw Violet Amethyst, Oval, VVS-VS

2.60ctw Violet Amethyst, Oval, VVS-VS

6.1 x 4.1 mm

$ 12.95

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2.63ct Yellow Citrine, Oval, VVS

2.63ct Yellow Citrine, Oval, VVS

11 x 9 mm (calibrated)

$ 18.33

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4.57ct Multicolor Fire Agate, Fancy, Opaque

4.57ct Multicolor Fire Agate, Fancy, Opaque

10.9 x 9.9 mm

$ 35.14

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1.43ct Yellow Beryl, Oval, VVS

1.43ct Yellow Beryl, Oval, VVS

9 x 7 mm (calibrated)

$ 28.49

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1.12ctw Violet Amethyst, Marquise, VS

1.12ctw Violet Amethyst, Marquise, VS

8 x 4 mm (calibrated)

$ 7.44

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26.36ct Multicolor Jasper, Oval, Opaque

26.36ct Multicolor Jasper, Oval, Opaque

31.9 x 21.4 mm

$ 17.89

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1.51ctw Green Peridot, Oval, VVS-VS

1.51ctw Green Peridot, Oval, VVS-VS

7 x 5 mm (calibrated)

$ 21.06

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3.99ct Violet Amethyst, Oval, Transparent

3.99ct Violet Amethyst, Oval, Transparent

11 x 9 mm (calibrated)

$ 23.85

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1.13ct Pink Tourmaline, Oval, Transparent

1.13ct Pink Tourmaline, Oval, Transparent

7.5 x 5.6 mm

$ 18.72

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11.82ct Green Prehnite, Fancy, Translucent

11.82ct Green Prehnite, Fancy, Translucent

18.2 x 12 mm

$ 19.42

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2.22ct Yellow Citrine, Oval, VVS

2.22ct Yellow Citrine, Oval, VVS

14 x 7 mm

$ 15.48

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144.19ct White Dendritic Agate, Oval, Opaque

144.19ct White Dendritic Agate, Oval, Opaque

62.4 x 41.6 mm

$ 71.81

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2.35ct Yellow Beryl, Round, VVS

2.35ct Yellow Beryl, Round, VVS

9 mm (calibrated)

$ 51.49

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1.74ct Multicolor Opal, Oval, Transparent

1.74ct Multicolor Opal, Oval, Transparent

11.4 x 8.1 mm

$ 80.07

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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

Filters need to be improved but rest of website is great

Posted By Rock hound in December, 2025
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Overall Rating -> 7 star ratings

Easy, quick.

Posted By Mich in June, 2026
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Overall Rating -> 10 star ratings

I have shopped at Gemselect for nearly 20 years. I especially like that you see pictures of the exact gem you are purchasing. You are a trusted source.

Posted By DNaber in October, 2025
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Overall Rating -> 10 star ratings

Everything was great, website user friendly, quality amazing, communication amazing, delivery amazing, everything was as expected, they done what they said they would, overall experience was amazing.

Posted By Jac in July, 2025
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Overall Rating -> 10 star ratings

Good selection, using for custom jewlery for my wife.

Posted By Smitty in June, 2025
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
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