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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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Yellow Untreated Gemstones
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0.63ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

0.63ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

6 x 3.8 mm

$ 33.26

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4.05ct Violet Amethyst, Pear Shape, VVS-VS

4.05ct Violet Amethyst, Pear Shape, VVS-VS

14 x 10 mm (calibrated)

$ 29.42

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5.26ct Multicolor Fire Agate, Fancy, Opaque

5.26ct Multicolor Fire Agate, Fancy, Opaque

12.6 x 10.3 mm

$ 41.09

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9.04ct Multicolor Ruby-Zoisite, Baguette, Opaque

9.04ct Multicolor Ruby-Zoisite, Baguette, Opaque

14 x 10 mm (calibrated)

$ 21.97

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7.21ctw Black Spinel, Round, Opaque

7.21ctw Black Spinel, Round, Opaque

9 mm (calibrated)

$ 23.70

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6.89ctw Multicolor Pietersite, Round, Opaque

6.89ctw Multicolor Pietersite, Round, Opaque

12 mm (calibrated)

$ 26.00

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0.77ct Purple Rhodolite Garnet, Oval, VS

0.77ct Purple Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 20.45

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3.05ct Violet Amethyst, Marquise, VVS

3.05ct Violet Amethyst, Marquise, VVS

15.2 x 7.2 mm

$ 21.26

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3.59ctw Orange Hessonite Garnet, Emerald Cut, VS

3.59ctw Orange Hessonite Garnet, Emerald Cut, VS

5 x 5 mm (calibrated)

$ 70.80

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2.11ct Multicolor Pietersite, Marquise, Opaque

2.11ct Multicolor Pietersite, Marquise, Opaque

15.3 x 5.7 mm

$ 5.11

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8.68ctw Red Hessonite Garnet, Oval, Translucent

8.68ctw Red Hessonite Garnet, Oval, Translucent

12 x 8 mm (calibrated)

$ 47.55

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5.24ct Brown Smoky Quartz, Emerald Cut, VVS-VS

5.24ct Brown Smoky Quartz, Emerald Cut, VVS-VS

13 x 10 mm

$ 22.97

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5.25ctw Green Prehnite, Oval, Transparent/Translucent

5.25ctw Green Prehnite, Oval, Transparent/Translucent

9.5 x 7.1 mm

$ 28.77

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21.44ct Black Obsidian, Pear Shape, Opaque

21.44ct Black Obsidian, Pear Shape, Opaque

27 x 20 mm (calibrated)

$ 10.67

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0.77ct Green Tourmaline, Emerald Cut, VVS

0.77ct Green Tourmaline, Emerald Cut, VVS

7.9 x 3.6 mm

$ 19.17

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5.12ct Multicolor Fire Agate, Fancy, Opaque

5.12ct Multicolor Fire Agate, Fancy, Opaque

14 x 9 mm (calibrated)

$ 39.38

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13.23ct Green Serpentine, Oval, Translucent

13.23ct Green Serpentine, Oval, Translucent

24.2 x 15.2 mm

$ 28.33

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0.71ct Pink Tourmaline, Oval, Transparent

0.71ct Pink Tourmaline, Oval, Transparent

6.3 x 4.7 mm

$ 11.76

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79.52ct Multicolor Jasper, Oval, Opaque

79.52ct Multicolor Jasper, Oval, Opaque

47.3 x 27.6 mm

$ 45.93

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3.32ct Black Cat'S Eye Scapolite, Oval, Translucent

3.32ct Black Cat'S Eye Scapolite, Oval, Translucent

9.5 x 7.4 mm

$ 18.19

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12.50ct Multicolor Bloodstone, Pear Shape, Opaque

12.50ct Multicolor Bloodstone, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 47.94

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4.06ct Yellow Citrine, Emerald Cut, VVS-VS

4.06ct Yellow Citrine, Emerald Cut, VVS-VS

11 x 9 mm (calibrated)

$ 31.13

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1.36ct Purple Spinel, Cushion, VVS-VS

1.36ct Purple Spinel, Cushion, VVS-VS

6.5 x 5.8 mm

$ 100.13

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10.10ct Multicolor Labradorite, Pear Shape, Translucent

10.10ct Multicolor Labradorite, Pear Shape, Translucent

16 x 12 mm (calibrated)

$ 18.61

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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

this site is awesome. I was able to look at the products think about purchasing and come back and find the same products. With the amount of inventory gem select has. Its awesome to be able to filter the way that they allow you too.

Posted By Tommyp in November, 2025
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

Overall Rating -> 10 star ratings

Great site for finding specific stones and sizes for individual pieces of jewelry

Posted By Designer in December, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Everything was good, the purchase was what I expected and what they show is what you get.

Posted By Mr. in March, 2026
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Overall Rating -> 10 star ratings

Great website, easy to navigate, and loads quickly. Have bought here before, very pleased!

Posted By SallyO in February, 2026
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Overall Rating -> 10 star ratings

good navigation and simple interface.

Posted By Dave in April, 2026
Source: Bizrate
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