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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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6.67ct Violet Chalcedony, Cushion, Translucent

6.67ct Violet Chalcedony, Cushion, Translucent

12 x 12 mm (calibrated)

$ 24.91

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0.52ct Orange Sphalerite, Round, SI

0.52ct Orange Sphalerite, Round, SI

4.5 mm (calibrated)

$ 25.90

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6.50ct Violet Amethyst, Marquise, VS

6.50ct Violet Amethyst, Marquise, VS

18.1 x 10.1 mm

$ 49.85

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0.33ct Orange Spessartite Garnet, Oval, VS-SI

0.33ct Orange Spessartite Garnet, Oval, VS-SI

5 x 3.1 mm

$ 11.50

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2.55ctw Violet Amethyst, Oval, VVS-VS

2.55ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 13.98

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2.96ct Yellow Citrine, Oval, VVS-VS

2.96ct Yellow Citrine, Oval, VVS-VS

10 x 8 mm (calibrated)

$ 16.22

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1.07ct Violet Amethyst, Marquise, VS

1.07ct Violet Amethyst, Marquise, VS

10 x 5 mm (calibrated)

$ 7.10

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30.00ct Multicolor Jasper, Fancy, Opaque

30.00ct Multicolor Jasper, Fancy, Opaque

34.2 x 19.1 mm

$ 32.87

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24.90ct Violet Amethyst, Emerald Cut, VVS

24.90ct Violet Amethyst, Emerald Cut, VVS

20 x 15 mm (calibrated)

$ 173.60

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0.88ctw Green Peridot, Pear Shape, VVS-VS

0.88ctw Green Peridot, Pear Shape, VVS-VS

6 x 4.2 mm

$ 7.01

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17.19ct Multicolor Cinnabar, Baguette, Opaque

17.19ct Multicolor Cinnabar, Baguette, Opaque

19.6 x 17.3 mm

$ 20.12

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1.49ct Red Pyrope Garnet, Fancy, VS

1.49ct Red Pyrope Garnet, Fancy, VS

9.2 x 3.4 mm

$ 17.84

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2.08ct Red Rhodolite Garnet, Oval, VS

2.08ct Red Rhodolite Garnet, Oval, VS

8.1 x 6.3 mm

$ 82.87

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10.47ctw Brown Hessonite Garnet, Oval, Translucent

10.47ctw Brown Hessonite Garnet, Oval, Translucent

11.9 x 8.9 mm

$ 57.36

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4.58ctw Pink Malaya Garnet, Round, VS
Malaya Garnet Product Video (355528)

4.58ctw Pink Malaya Garnet, Round, VS

5.5 mm (calibrated)

$ 180.64

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27.75ct Gray Hematite, Square, Opaque

27.75ct Gray Hematite, Square, Opaque

17 x 17 mm (calibrated)

$ 27.97

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19.70ct Violet Amethyst, Cushion, VVS

19.70ct Violet Amethyst, Cushion, VVS

20 x 15 mm (calibrated)

$ 137.35

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1.52ct Green Sphene, Oval, Transparent

1.52ct Green Sphene, Oval, Transparent

7.1 x 6 mm

$ 7.57

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31.54ct Multicolor Jasper, Fancy, Opaque

31.54ct Multicolor Jasper, Fancy, Opaque

34.3 x 22.3 mm

$ 26.61

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1.35ctw Red Pyrope Garnet, Pear Shape, VS

1.35ctw Red Pyrope Garnet, Pear Shape, VS

7 x 5 mm (calibrated)

$ 10.76

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1.48ct Pink Tourmaline, Emerald Cut, VVS-VS

1.48ct Pink Tourmaline, Emerald Cut, VVS-VS

10 x 4.8 mm

$ 111.88

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44.34ct Red Strawberry Quartz, Fancy, Opaque

44.34ct Red Strawberry Quartz, Fancy, Opaque

37.3 x 12.4 mm

$ 4.42

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0.26ctw Black Diamond, Round, Opaque

0.26ctw Black Diamond, Round, Opaque

3 mm (calibrated)

$ 123.69

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0.49ct Yellow Citrine, Cushion, VVS

0.49ct Yellow Citrine, Cushion, VVS

5 x 5 mm (calibrated)

$ 3.42

View Gem
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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

Easy to use website

Posted By Mel in February, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Fast and reliable service.

Posted By Zæck in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I love the product and the details about each of them.

Posted By Love It! in July, 2025
Source: Bizrate

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

Filters need to be improved but rest of website is great

Posted By Rock hound in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection of gems at a reasonable price

Posted By Curt in July, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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