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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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1.79ctw Red Pyrope Garnet, Marquise, VVS-VS

1.79ctw Red Pyrope Garnet, Marquise, VVS-VS

10 x 5 mm

$ 15.69

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11.39ct Green Rutile Quartz, Oval, Transparent

11.39ct Green Rutile Quartz, Oval, Transparent

21.5 x 10.5 mm

$ 27.08

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1.00ct Yellow Morganite, Oval, VVS-VS

1.00ct Yellow Morganite, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 43.82

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2.59ctw Green Kornerupine, Pear Shape, VVS-VS

2.59ctw Green Kornerupine, Pear Shape, VVS-VS

6.7 x 4.9 mm

$ 113.50

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5.53ctw Green Prehnite, Oval, Transparent/Translucent

5.53ctw Green Prehnite, Oval, Transparent/Translucent

9.8 x 8.4 mm

$ 15.14

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16.10ct Multicolor Boulder Opal, Cushion, Opaque

16.10ct Multicolor Boulder Opal, Cushion, Opaque

22.3 x 12.7 mm

$ 112.25

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19.64ctw Multicolor Jasper, Oval, Opaque

19.64ctw Multicolor Jasper, Oval, Opaque

18 x 13 mm (calibrated)

$ 21.51

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0.99ct Pink Tourmaline, Oval, Transparent

0.99ct Pink Tourmaline, Oval, Transparent

7 x 5 mm (calibrated)

$ 39.44

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5.08ctw Multicolor Labradorite, Pear Shape, Translucent

5.08ctw Multicolor Labradorite, Pear Shape, Translucent

10 x 7 mm (calibrated)

$ 11.24

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16.44ct Multicolor Jasper, Pear Shape, Opaque

16.44ct Multicolor Jasper, Pear Shape, Opaque

27 x 18.4 mm

$ 13.60

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23.75ct Multicolor Tiger'S Eye Matrix, Fancy, Opaque

23.75ct Multicolor Tiger'S Eye Matrix, Fancy, Opaque

33.7 x 11.6 mm

$ 23.66

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12.80ctw Violet Amethyst, Cushion, VVS
Amethyst Product Video (694436)

12.80ctw Violet Amethyst, Cushion, VVS

15.2 x 9.3 mm

$ 89.24

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4.80ctw Yellow Citrine, Heart, VS

4.80ctw Yellow Citrine, Heart, VS

7 x 7 mm (calibrated)

$ 26.29

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1.37ct Orange Hessonite Garnet, Emerald Cut, VS

1.37ct Orange Hessonite Garnet, Emerald Cut, VS

7 x 5 mm (calibrated)

$ 27.02

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9.41ct Violet Amethyst, Heart, Transparent

9.41ct Violet Amethyst, Heart, Transparent

16.1 x 12.5 mm

$ 46.86

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3.02ctw Red Pyrope Garnet, Heart, VVS-VS

3.02ctw Red Pyrope Garnet, Heart, VVS-VS

6 x 6 mm (calibrated)

$ 23.16

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16.97ctw Black Spinel, Heart, Opaque

16.97ctw Black Spinel, Heart, Opaque

13 x 13 mm (calibrated)

$ 55.78

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1.78ct Orange Hessonite Garnet, Cushion, VS-SI

1.78ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 29.93

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2.08ct Orange Zircon, Pear Shape, VS

2.08ct Orange Zircon, Pear Shape, VS

7.5 x 6.7 mm

$ 45.81

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0.44ct Yellow Citrine, Marquise, VVS

0.44ct Yellow Citrine, Marquise, VVS

8 x 4 mm (calibrated)

$ 3.29

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0.80ct Blue Kyanite, Round, SI

0.80ct Blue Kyanite, Round, SI

6 mm (calibrated)

$ 19.92

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0.92ct Green Tourmaline, Emerald Cut, VS

0.92ct Green Tourmaline, Emerald Cut, VS

10.8 x 3.3 mm

$ 22.91

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1.50ct Multicolor Opal, Pear Shape, Transparent

1.50ct Multicolor Opal, Pear Shape, Transparent

11.9 x 7.2 mm

$ 37.35

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20.36ct Multicolor Jasper, Cushion, Opaque

20.36ct Multicolor Jasper, Cushion, Opaque

19.8 x 19.2 mm

$ 12.49

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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

I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.

Posted By Fried Rice in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I loved it! Extensive inventory, great prices, I definitely will be buying from here again!

Posted By Lex in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I can pick and choose from large selection and find just what I need for .y projects, currently my cane.

Posted By Darkstar731 in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very good.

Posted By Tommy in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

This is the first time I have used this site. I was dissatisfied with the quality of gems and supplies elsewhere and decided to try GemSelect. They are awesome! I was thrilled to see the variety and the great web performance. There was the ability to search for information as well as gems. Things like the clarity rating system and caret weight of the gems. I have always loved making things and I have just started to make jewelry as a business. However I have never made a ring before and have always wanted to. On GemSelect I was able to find good quality gems to use in my creations. I am so glad the website is so easy to use. Thank you GemSelect.

Posted By PickyShopper in April, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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