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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
Untreated Gemstones Clarity
Untreated Gemstones Price
Untreated Gemstones Treatment

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Yellow Untreated Gemstones
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10.93ct Brown Tiger'S Eye, Flower Cut, Opaque

10.93ct Brown Tiger'S Eye, Flower Cut, Opaque

15 x 15 mm (calibrated)

$ 14.38

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0.45ct Yellow Citrine, Cushion, Transparent

0.45ct Yellow Citrine, Cushion, Transparent

5 x 5 mm (calibrated)

$ 3.36

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1.09ct Brown Kornerupine, Baguette, VVS

1.09ct Brown Kornerupine, Baguette, VVS

5.4 x 4.8 mm

$ 90.47

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1.38ct Gray Sillimanite Cat'S Eye, Oval, Transparent

1.38ct Gray Sillimanite Cat'S Eye, Oval, Transparent

7.1 x 4.8 mm

$ 4.35

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1.32ctw Green Demantoid Garnet, Oval, VS
Demantoid Garnet Product Video (458406)

1.32ctw Green Demantoid Garnet, Oval, VS

4.3 x 3.6 mm

$ 144.62

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0.34ct Brown Color-Change Sapphire, Emerald Cut, VVS

0.34ct Brown Color-Change Sapphire, Emerald Cut, VVS

4 x 3.4 mm

$ 28.22

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2.83ct Green Apatite, Emerald Cut, VS

2.83ct Green Apatite, Emerald Cut, VS

8.8 x 8.5 mm

$ 77.52

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1.27ct Multicolor Opal, Oval, Translucent

1.27ct Multicolor Opal, Oval, Translucent

10 x 8 mm (calibrated)

$ 55.66

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13.73ct Multicolor Agate, Fancy, Translucent

13.73ct Multicolor Agate, Fancy, Translucent

14.5 x 9.7 mm

$ 24.05

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9.61ct Multicolor Agate, Sphere / Ball, Opaque
Agate Product Video (470750)

9.61ct Multicolor Agate, Sphere / Ball, Opaque

11 mm (calibrated)

$ 7.69

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37.52ctw Multicolor Jasper, Fancy, Opaque

37.52ctw Multicolor Jasper, Fancy, Opaque

35.2 x 18.5 mm

$ 41.10

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2.60ctw Red Pyrope Garnet, Square, VVS-VS

2.60ctw Red Pyrope Garnet, Square, VVS-VS

4 x 4 mm (calibrated)

$ 19.94

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57.88ct Violet Amethyst, Pear Shape, VVS
Amethyst Product Video (724426)

57.88ct Violet Amethyst, Pear Shape, VVS

30 x 22 mm (calibrated)

$ 433.52

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12.50ct Multicolor Boulder Opal, Oval, Translucent

12.50ct Multicolor Boulder Opal, Oval, Translucent

22.8 x 11.5 mm

$ 87.15

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1.44ct Red Tourmaline, Oval, VVS-VS

1.44ct Red Tourmaline, Oval, VVS-VS

7.6 x 6.5 mm

$ 215.14

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3.92ct Yellow Rutile Quartz, Oval, Transparent

3.92ct Yellow Rutile Quartz, Oval, Transparent

12 x 8 mm (calibrated)

$ 9.76

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2.63ct Yellow Citrine, Oval, VVS

2.63ct Yellow Citrine, Oval, VVS

12 x 8 mm (calibrated)

$ 15.93

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26.91ct Multicolor Quartz With Marcasite, Fancy, Transparent

26.91ct Multicolor Quartz With Marcasite, Fancy, Transparent

30 x 15.4 mm

$ 147.42

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1.63ct Orange Moonstone, Trillion, Translucent

1.63ct Orange Moonstone, Trillion, Translucent

8 x 8 mm (calibrated)

$ 3.25

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1.63ct Purple Spinel, Oval, VS

1.63ct Purple Spinel, Oval, VS

7.5 x 5.9 mm

$ 270.58

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4.96ct Yellow Citrine, Oval, VVS-VS

4.96ct Yellow Citrine, Oval, VVS-VS

14 x 10 mm (calibrated)

$ 29.78

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0.40ct Orange Citrine, Marquise, VVS-VS

0.40ct Orange Citrine, Marquise, VVS-VS

8 x 4 mm (calibrated)

$ 2.79

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20.84ct Multicolor Quartz With Marcasite, Pear Shape, Transparent
Quartz With Marcasite Product Video (522190)

20.84ct Multicolor Quartz With Marcasite, Pear Shape, Transparent

26.3 x 14.8 mm

$ 136.99

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4.92ct Green Prehnite, Fancy, Translucent

4.92ct Green Prehnite, Fancy, Translucent

14.4 x 10.4 mm

$ 8.08

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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

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

Overall Rating -> 9 star ratings

It was fine . Wish there had been more round stones to select from

Posted By Emm in January, 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

Although the stones are smaller than I thought, I really don't think in millimeters, they are perfect. I plan to put one into a ring and the other into a necklace. Ordering was easy, contact kept me aware of how shipping was going, and delivery was sooner than expected. The quality of stones I have ordered in the past and this recent order is outstanding and stones I will be proud to wear.

Posted By Ktreva52 in June, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Found a rock that met my need. Bought it!

Posted By Skot in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I have made many purchases from GemSelect over the years, and I have a beautiful collection of jewelry as a result. My purchases have always been exactly as described, and I have enjoyed doing business with you.

Posted By MMM in July, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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