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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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1.10ct Purple Spinel, Cushion, VVS-VS

1.10ct Purple Spinel, Cushion, VVS-VS

6.7 x 5.9 mm

$ 109.56

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0.51ct Green Peridot, Marquise, VS

0.51ct Green Peridot, Marquise, VS

7.5 x 3.7 mm

$ 7.62

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0.62ct Yellow Color-Change Garnet, Emerald Cut, VVS-VS

0.62ct Yellow Color-Change Garnet, Emerald Cut, VVS-VS

7.1 x 3.5 mm

$ 71.32

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10.83ct Multicolor Pietersite, Cushion, Opaque

10.83ct Multicolor Pietersite, Cushion, Opaque

23.9 x 10.3 mm

$ 35.96

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15.75ctw Black Spinel, Oval, Opaque

15.75ctw Black Spinel, Oval, Opaque

14 x 10 mm (calibrated)

$ 51.78

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12.50ct White Hiddenite, Cushion, VS
Hiddenite Product Video (734045)

12.50ct White Hiddenite, Cushion, VS

17.7 x 9.5 mm

$ 310.25

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2.61ctw White Topaz, Cushion, VVS-VS

2.61ctw White Topaz, Cushion, VVS-VS

4.5 x 4.5 mm

$ 14.30

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28.35ct White Scolecite, Cushion, Opaque

28.35ct White Scolecite, Cushion, Opaque

25.1 x 23.7 mm

$ 33.86

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0.06ct Black Diamond, Round, Opaque

0.06ct Black Diamond, Round, Opaque

2.3 mm (calibrated)

$ 19.54

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2.46ct Orange Moonstone, Cushion, Translucent

2.46ct Orange Moonstone, Cushion, Translucent

8 x 8 mm (calibrated)

$ 4.90

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1.56ct Violet Amethyst, Marquise, VS

1.56ct Violet Amethyst, Marquise, VS

12 x 6 mm (calibrated)

$ 10.26

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18.36ct Violet Amethyst, Pear Shape, VVS

18.36ct Violet Amethyst, Pear Shape, VVS

21.3 x 16.1 mm

$ 128.00

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27.85ctw Multicolor Cinnabar, Cushion, Opaque

27.85ctw Multicolor Cinnabar, Cushion, Opaque

18 x 18 mm (calibrated)

$ 32.59

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0.76ct Yellow Color-Change Diaspore, Emerald Cut, VS-SI

0.76ct Yellow Color-Change Diaspore, Emerald Cut, VS-SI

7.1 x 3.5 mm

$ 27.25

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3.84ctw Brown Smoky Quartz, Round, VS

3.84ctw Brown Smoky Quartz, Round, VS

8 mm (calibrated)

$ 8.42

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1.22ct Yellow Color-Change Diaspore, Cushion, VS

1.22ct Yellow Color-Change Diaspore, Cushion, VS

10.8 x 4.5 mm

$ 42.77

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1.37ct Brown Color-Change Garnet, Oval, VS

1.37ct Brown Color-Change Garnet, Oval, VS

6.8 x 5.7 mm

$ 109.45

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4.21ctw White Topaz, Square, VS

4.21ctw White Topaz, Square, VS

4 x 4 mm (calibrated)

$ 32.29

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1.20ct Purple Rhodolite Garnet, Oval, VS

1.20ct Purple Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 31.87

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0.99ct Yellow Morganite, Cushion, VS

0.99ct Yellow Morganite, Cushion, VS

6 x 6 mm (calibrated)

$ 59.66

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7.28ct Yellow Apatite, Oval, VS-SI

7.28ct Yellow Apatite, Oval, VS-SI

14.8 x 11.4 mm

$ 239.28

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29.37ct Pink Rose Quartz, Oval, Transparent/Translucent

29.37ct Pink Rose Quartz, Oval, Transparent/Translucent

21.5 x 13.9 mm

$ 41.83

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0.09ct Green Alexandrite, Pear Shape, VS

0.09ct Green Alexandrite, Pear Shape, VS

3.3 x 2.5 mm

$ 62.75

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3.38ct Green Prehnite, Oval, Transparent/Translucent

3.38ct Green Prehnite, Oval, Transparent/Translucent

9.6 x 8.3 mm

$ 10.00

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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 -> 8 star ratings

I visited several online loose stone shops trying to find rare stones. I finally found one that I've been looking for here, and very satisfied. Looking forward to receive the item in 3 weeks.

Posted By Atsu in December, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Fast and reliable service.

Posted By Zæck in December, 2025
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

It was easy to navigate

Posted By GemGod in July, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly

Posted By Ron T in November, 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
→ View All GemSelect Reviews on Bizrate
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