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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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Untreated Gemstones Treatment

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9.67ctw Violet Amethyst, Oval, Transparent

9.67ctw Violet Amethyst, Oval, Transparent

12 x 10 mm (calibrated)

$ 52.98

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1.57ct Violet Amethyst, Marquise, Transparent

1.57ct Violet Amethyst, Marquise, Transparent

12 x 6 mm (calibrated)

$ 10.95

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1.91ct Green Tourmaline, Emerald Cut, VVS-VS

1.91ct Green Tourmaline, Emerald Cut, VVS-VS

20.4 x 3.5 mm

$ 50.22

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0.61ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

0.61ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

8.1 x 3.7 mm

$ 21.38

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0.96ct Orange Hessonite Garnet, Round, VS

0.96ct Orange Hessonite Garnet, Round, VS

6 mm (calibrated)

$ 16.28

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24.60ctw Multicolor Fossil Coral, Trillion, Opaque

24.60ctw Multicolor Fossil Coral, Trillion, Opaque

20.9 x 14 mm

$ 48.51

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5.00ct Yellow Citrine, Oval, VVS-VS

5.00ct Yellow Citrine, Oval, VVS-VS

14 x 10 mm (calibrated)

$ 30.02

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1.56ct Yellow Citrine, Round, VS

1.56ct Yellow Citrine, Round, VS

8 mm (calibrated)

$ 12.43

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3.20ct Yellow Rutile Quartz, Oval, Transparent

3.20ct Yellow Rutile Quartz, Oval, Transparent

12 x 8 mm (calibrated)

$ 8.76

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9.06ct Brown Smoky Quartz, Round, VS

9.06ct Brown Smoky Quartz, Round, VS

15 mm (calibrated)

$ 14.89

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1.23ct Orange Hessonite Garnet, Oval, VS

1.23ct Orange Hessonite Garnet, Oval, VS

7.1 x 5.7 mm

$ 24.50

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7.66ct Blue Larimar, Round, Opaque

7.66ct Blue Larimar, Round, Opaque

13 mm (calibrated)

$ 98.44

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5.53ct Yellow Citrine, Emerald Cut, VVS

5.53ct Yellow Citrine, Emerald Cut, VVS

12 x 8 mm (calibrated)

$ 38.55

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1.66ct Pink Tourmaline, Pear Shape, Transparent

1.66ct Pink Tourmaline, Pear Shape, Transparent

9 x 6 mm (calibrated)

$ 34.45

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3.14ct Violet Amethyst, Trillion, VS

3.14ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 24.09

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0.88ct Yellow Color-Change Diaspore, Oval, VS

0.88ct Yellow Color-Change Diaspore, Oval, VS

7 x 5 mm (calibrated)

$ 32.58

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0.56ct Pink Spinel, Round, VVS-VS

0.56ct Pink Spinel, Round, VVS-VS

5 mm (calibrated)

$ 41.83

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0.88ctw White Rainbow Moonstone, Oval, Transparent

0.88ctw White Rainbow Moonstone, Oval, Transparent

6.3 x 4.2 mm

$ 28.93

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5.74ct Multicolor Opal, Oval, Transparent

5.74ct Multicolor Opal, Oval, Transparent

14 x 11.5 mm

$ 142.93

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1.48ct Yellow Citrine, Emerald Cut, VVS

1.48ct Yellow Citrine, Emerald Cut, VVS

12.2 x 4.3 mm

$ 11.79

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1.80ct Red Pyrope Garnet, Marquise, VVS-VS

1.80ct Red Pyrope Garnet, Marquise, VVS-VS

11.9 x 6 mm

$ 15.78

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18.85ctw Multicolor Fossil Coral, Cushion, Opaque

18.85ctw Multicolor Fossil Coral, Cushion, Opaque

16 x 12 mm (calibrated)

$ 37.17

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6.61ct Gray Star Sapphire, Oval, Opaque
Star Sapphire Product Video (470806)

6.61ct Gray Star Sapphire, Oval, Opaque

10 x 10 mm (calibrated)

$ 253.47

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17.67ct Violet Amethyst, Emerald Cut, VVS-VS

17.67ct Violet Amethyst, Emerald Cut, VVS-VS

17.9 x 13.9 mm

$ 123.20

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! Affordable

Posted By Spinellope in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Very good

Posted By Niska in August, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.

Posted By Meyeusername in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Took a chance on purchasing my gemstones from Gemselect and was impressed. 10/10

Posted By KT in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Enjoy viewing the selections. Excellent product

Posted By ToRa.62 in April, 2026
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
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