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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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15.88ct Multicolor Rainbow Pyrite, Fancy, Opaque

15.88ct Multicolor Rainbow Pyrite, Fancy, Opaque

22.9 x 20.4 mm

$ 41.13

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2.59ct Green Peridot, Cushion, VS-SI
Peridot Product Video (447059)

2.59ct Green Peridot, Cushion, VS-SI

8.4 x 8 mm

$ 101.58

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5.87ct Yellow Citrine, Oval, VVS-VS

5.87ct Yellow Citrine, Oval, VVS-VS

14 x 10 mm (calibrated)

$ 35.25

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10.16ct Green Opal, Oval, Opaque

10.16ct Green Opal, Oval, Opaque

16.7 x 14.4 mm

$ 21.75

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16.45ct Pink Rose Quartz, Oval, Transparent/Translucent

16.45ct Pink Rose Quartz, Oval, Transparent/Translucent

16.4 x 13.9 mm

$ 23.42

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1.23ct Green Tourmaline, Baguette, VVS

1.23ct Green Tourmaline, Baguette, VVS

7.9 x 5.3 mm

$ 42.88

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1.39ct Yellow Beryl, Pear Shape, VVS-VS

1.39ct Yellow Beryl, Pear Shape, VVS-VS

10 x 7 mm (calibrated)

$ 27.69

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1.56ct Green Tourmaline, Oval, VVS-VS

1.56ct Green Tourmaline, Oval, VVS-VS

7.5 x 6.4 mm

$ 181.27

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0.47ct Red Pyrope Garnet, Heart, VS

0.47ct Red Pyrope Garnet, Heart, VS

5 x 5 mm (calibrated)

$ 11.70

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5.38ct Multicolor Opal, Pear Shape, Transparent

5.38ct Multicolor Opal, Pear Shape, Transparent

13 x 13 mm (calibrated)

$ 133.96

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2.92ctw Yellow Golden Beryl, Oval, VS

2.92ctw Yellow Golden Beryl, Oval, VS

9 x 7 mm (calibrated)

$ 63.98

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2.01ct Orange Hessonite Garnet, Square, VS-SI

2.01ct Orange Hessonite Garnet, Square, VS-SI

7.4 x 7.3 mm

$ 44.04

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1.86ct Orange Hessonite Garnet, Emerald Cut, VS-SI

1.86ct Orange Hessonite Garnet, Emerald Cut, VS-SI

7 x 7 mm (calibrated)

$ 36.69

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0.93ctw Green Peridot, Marquise, VS

0.93ctw Green Peridot, Marquise, VS

8 x 4 mm (calibrated)

$ 13.89

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5.77ct Brown Smoky Quartz, Emerald Cut, VVS-VS

5.77ct Brown Smoky Quartz, Emerald Cut, VVS-VS

10 x 10 mm (calibrated)

$ 31.61

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1.59ct Violet Amethyst, Pear Shape, VVS-VS

1.59ct Violet Amethyst, Pear Shape, VVS-VS

10 x 7 mm (calibrated)

$ 10.45

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3.09ctw Violet Amethyst, Oval, VVS-VS

3.09ctw Violet Amethyst, Oval, VVS-VS

7.1 x 5.2 mm

$ 16.93

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4.26ctw Red Pyrope Garnet, Square, VS

4.26ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 32.67

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2.14ct Orange Moonstone, Cushion, Translucent

2.14ct Orange Moonstone, Cushion, Translucent

9 x 7 mm (calibrated)

$ 4.27

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7.32ct Yellow Calcite, Pear Shape, Translucent

7.32ct Yellow Calcite, Pear Shape, Translucent

25.2 x 10.8 mm

$ 5.03

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11.34ctw Green Prehnite, Oval, Transparent
Prehnite Product Video (450183)

11.34ctw Green Prehnite, Oval, Transparent

6.8 x 5.3 mm

$ 124.24

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15.37ct Violet Amethyst, Flower Cut, Translucent

15.37ct Violet Amethyst, Flower Cut, Translucent

16 x 16 mm (calibrated)

$ 45.92

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19.16ct Violet Amethyst, Emerald Cut, VVS

19.16ct Violet Amethyst, Emerald Cut, VVS

20 x 15 mm (calibrated)

$ 133.58

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2.23ct Brown Smoky Quartz, Oval, VVS

2.23ct Brown Smoky Quartz, Oval, VVS

9.6 x 7.7 mm

$ 15.55

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

Great website, easy to navigate, and loads quickly. Have bought here before, very pleased!

Posted By SallyO in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

No problems. I had a minor address issue in the past and someone got back to me very quickly and we resolved the issue satisfactorily. I appreciated the quick, concerned response. So important when buyer/seller are so far apart in distance. Thank you Gem Select. Keep up the good work!

Posted By Orphanboy in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

good navigation and simple interface.

Posted By Dave in April, 2026
Source: Bizrate

Overall Rating -> 7 star ratings

easy interface for a pricless buy

Posted By Zeak in May, 2026
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

The stones are very nice.

Posted By Mvk in August, 2025
Source: Bizrate
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