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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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3.63ct Yellow Citrine, Cushion, VVS-VS

13 x 8 mm

$ 19.89

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2.75ct Turquoise Grandidierite, Oval, VS-SI

9.5 x 8.1 mm

$ 361.55

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1.46ctw Green Demantoid Garnet, Oval, VS

4.7 x 3.8 mm

$ 159.96

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28.51ct Green Serpentine, Oval, Translucent

31.5 x 18.9 mm

$ 61.05

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1.22ct Green Tourmaline, Baguette, VS

7.7 x 5 mm

$ 36.45

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0.66ct Orange Hessonite Garnet, Baguette, VS

5 x 4.2 mm

$ 9.81

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1.21ct Purple Spinel, Cushion, VS

6.5 x 6.1 mm

$ 120.52

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6.42ct Green Actinolite Cat'S Eye, Oval, Translucent

11.6 x 11.3 mm

$ 44.76

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3.19ct Pink Coral, Flower Cut, Opaque

13.7 x 9.7 mm

$ 47.93

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2.49ct Pink Tourmaline, Emerald Cut, VVS-VS

10.8 x 7.2 mm

$ 289.34

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1.23ct Green Sphene, Oval, Transparent

6.9 x 5.8 mm

$ 6.13

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0.79ct Yellow Color-Change Diaspore, Emerald Cut, VVS

6.5 x 4.2 mm

$ 41.70

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6.20ct White Rutile Quartz, Round, Transparent

11 mm (calibrated)

$ 15.55

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14.50ct Multicolor Jasper, Oval, Opaque

20.9 x 14.7 mm

$ 8.90

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2.78ct Yellow Citrine, Oval, VS

10.4 x 8.5 mm

$ 21.32

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5.04ctw Yellow Citrine, Oval, VVS-VS

10 x 8 mm (calibrated)

$ 27.61

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14.02ct Violet Charoite, Pear Shape, Opaque

21.9 x 12.7 mm

$ 23.17

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18.23ct Bi-Color Ametrine, Marquise, VS

27.7 x 13.6 mm

$ 139.81

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2.51ctw Green Peridot, Round, VVS-VS

4.5 mm (calibrated)

$ 41.25

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1.54ct Orange Hessonite Garnet, Cushion, VS

7 x 7 mm (calibrated)

$ 73.01

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2.55ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 19.56

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1.54ct Pink Tourmaline, Emerald Cut, VVS-VS

7.9 x 5.3 mm

$ 111.35

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29.54ct Multicolor Quartz With Marcasite, Oval, Transparent

26.5 x 18.1 mm

$ 194.18

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3.14ctw Orange Citrine, Pear Shape, VVS-VS

10 x 7 mm (calibrated)

$ 26.06

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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

I loved it! Extensive inventory, great prices, I definitely will be buying from here again!

Posted By Lex in April, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

Good prices

Posted By TRM in October, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

It was fine

Posted By Na in April, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Will know more once order received

Posted By Jim in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

Posted By Tim W in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection of gems at a reasonable price

Posted By Curt in July, 2025
Source: Bizrate
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