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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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98.13ct Orange Druzy Citrine, Fancy, Opaque

98.13ct Orange Druzy Citrine, Fancy, Opaque

36.9 x 34 mm

$ 48.14

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0.63ct Green Sphene, Oval, Transparent

0.63ct Green Sphene, Oval, Transparent

6.1 x 5.2 mm

$ 7.77

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3.59ctw Green Prehnite, Round, Transparent

3.59ctw Green Prehnite, Round, Transparent

6 mm (calibrated)

$ 19.67

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0.81ct Yellow Color-Change Diaspore, Cushion, VVS

0.81ct Yellow Color-Change Diaspore, Cushion, VVS

6.1 x 4.8 mm

$ 42.76

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1.20ct Multicolor Opal, Oval, Translucent

1.20ct Multicolor Opal, Oval, Translucent

10 x 8 mm (calibrated)

$ 24.90

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1.18ctw Green Tsavorite Garnet, Baguette, VS

1.18ctw Green Tsavorite Garnet, Baguette, VS

3 x 1.7 mm

$ 59.25

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1.12ct Orange Sphalerite, Round, SI-I1

1.12ct Orange Sphalerite, Round, SI-I1

6 mm (calibrated)

$ 55.78

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5.25ct White Jadeite, Marquise, Translucent

5.25ct White Jadeite, Marquise, Translucent

20.8 x 11.2 mm

$ 17.26

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2.07ct Green Tourmaline, Emerald Cut, VS-SI
Tourmaline Product Video (693743)

2.07ct Green Tourmaline, Emerald Cut, VS-SI

11 x 5 mm

$ 103.09

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1.56ct Multicolor Opal, Pear Shape, Translucent

1.56ct Multicolor Opal, Pear Shape, Translucent

12 x 8 mm (calibrated)

$ 45.78

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6.69ct Multicolor Ruby In Fuchsite, Marquise, Translucent

6.69ct Multicolor Ruby In Fuchsite, Marquise, Translucent

19.2 x 11.1 mm

$ 49.99

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0.99ct Blue Kyanite, Oval, VS-SI

0.99ct Blue Kyanite, Oval, VS-SI

7 x 5 mm (calibrated)

$ 21.70

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2.54ctw Violet Amethyst, Oval, VS

2.54ctw Violet Amethyst, Oval, VS

6 x 4 mm (calibrated)

$ 13.91

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3.12ct Yellow Rutile Quartz, Oval, Transparent

3.12ct Yellow Rutile Quartz, Oval, Transparent

12 x 8 mm (calibrated)

$ 8.55

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0.84ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

0.84ct Yellow Color-Change Diaspore, Pear Shape, VVS-VS

10.5 x 4.1 mm

$ 29.45

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1.92ct Orange Moonstone, Square, Translucent

1.92ct Orange Moonstone, Square, Translucent

7 x 7 mm (calibrated)

$ 3.84

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3.11ct Violet Amethyst, Trillion, VVS-VS

3.11ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 21.68

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35.82ctw Yellow Rutile Quartz, Sphere / Ball, Transparent

35.82ctw Yellow Rutile Quartz, Sphere / Ball, Transparent

14 mm (calibrated)

$ 39.24

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12.29ctw Black Spinel, Round, Opaque

12.29ctw Black Spinel, Round, Opaque

12 mm (calibrated)

$ 38.24

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86.18ct Red Star Garnet, Round, Opaque

86.18ct Red Star Garnet, Round, Opaque

25 mm

$ 89.27

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12.81ctw Violet Amethyst, Oval, Transparent

12.81ctw Violet Amethyst, Oval, Transparent

14 x 10 mm (calibrated)

$ 70.18

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5.99ct Yellow Citrine, Round, VVS

5.99ct Yellow Citrine, Round, VVS

12 mm (calibrated)

$ 45.93

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3.14ctw White Rainbow Moonstone, Pear Shape, Transparent

3.14ctw White Rainbow Moonstone, Pear Shape, Transparent

5 x 5 mm (calibrated)

$ 68.81

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2.82ct Blue Chalcedony, Oval, Transparent

2.82ct Blue Chalcedony, Oval, Transparent

10 x 8 mm (calibrated)

$ 5.62

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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 -> 9 star ratings

They have literally everything on this website! The prices are also pretty good, I was able to find plenty of nice stones that I could afford!

Posted By JC in March, 2026
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 -> 10 star ratings

Wonderful purchase, can't wait to see the stone.

Posted By Tim in January, 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

On the clarity options it goes "and better" so if youre looking for si specifically and you click si and better it still shows you basically everything. It just removes the opaques. Itd be nice if it was vs only, vss only, si only, etc

Posted By Iamnotakrustykrab in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very good. I have made several purchases as a collector over the years, and have never been dissapointed in the selection, process, or delivery.

Posted By Schmoove in August, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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