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Home Gemstones Untreated Gemstones

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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2.71ct Green Tourmaline, Emerald Cut, VVS-VS

15.7 x 5 mm

$ 61.86

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2.29ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 42.94

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11.45ctw Green Amazonite, Cushion, Opaque

10 x 10 mm (calibrated)

$ 23.21

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13.08ct Pink Rose Quartz, Emerald Cut, Transparent

14 x 14 mm (calibrated)

$ 71.65

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23.76ct Black Nuummite, Oval, Opaque

19.2 x 16.8 mm

$ 97.50

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0.99ct Green Tsavorite Garnet, Oval, VS-SI

7 x 5 mm (calibrated)

$ 542.32

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1.37ct Yellow Color-Change Diaspore, Pear Shape, VS-SI

10 x 5.7 mm

$ 65.59

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35.99ct Multicolor Boulder Opal, Fancy, Opaque

45 x 23.8 mm

$ 107.53

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7.82ct Multicolor Ruby In Fuchsite, Marquise, Translucent

25.5 x 12.5 mm

$ 58.42

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39.03ct Multicolor Jasper, Pear Shape, Opaque

33.5 x 33.2 mm

$ 64.13

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7.55ct Yellow Citrine, Pear Shape, VVS-VS

16 x 12 mm (calibrated)

$ 48.27

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8.13ct Green Prehnite, Fancy, Transparent

18.1 x 16.9 mm

$ 13.18

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9.14ct Red Strawberry Quartz, Oval, Translucent

17.1 x 12.7 mm

$ 70.10

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20.92ct Multicolor Quartz With Hedenbergite, Oval, Transparent

22.1 x 16 mm

$ 85.95

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56.79ct Multicolor Rainbow Pyrite, Fancy, Opaque

34.8 x 17.6 mm

$ 147.06

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31.34ct Brown Moonstone, Oval, Opaque

20.2 x 16.2 mm

$ 57.23

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87.19ct Pink Rose Quartz, Trillion, Transparent

32.9 x 27.6 mm

$ 159.21

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0.17ct Yellow Diamond, Round, VS-SI

3.5 mm (calibrated)

$ 306.68

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47.89ct Gray Hematite, Oval, Opaque

23.6 x 18.7 mm

$ 46.70

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6.50ct Multicolor Quartz With Marcasite, Trillion, Transparent

15 x 15 mm (calibrated)

$ 35.61

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2.31ct Multicolor Spectrolite, Round, Opaque

10 mm (calibrated)

$ 9.07

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2.33ctw Pink Morganite, Oval, VVS-VS

6 x 6 mm (calibrated)

$ 127.64

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58.60ct Black Nuummite, Fancy, Opaque

38.6 x 32 mm

$ 211.22

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14.93ctw Brown Tiger'S Eye, Baguette, Opaque

14 x 10 mm (calibrated)

$ 16.35

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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

Would have bought an indigo and selenite, but neither listed. But, you do offer quite a large assortment otherwise.

Posted By JD in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

It was good. There was a large selection at prices I could afford.

Posted By Zorah in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Excellent options

Posted By CJ in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

overall great

Posted By SR in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Navigating the site was very easy and the photos of the exact gem you would be purchasing was well done.

Posted By HVeeder in February, 2026
Source: Bizrate
Enlarged Gemstone Image