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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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Bi-color Untreated Gemstones
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84.37ct Multicolor Jasper, Cushion, Opaque

84.37ct Multicolor Jasper, Cushion, Opaque

38.4 x 38 mm

$ 51.78

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0.53ct Yellow Color-Change Diaspore, Oval, VVS-VS

0.53ct Yellow Color-Change Diaspore, Oval, VVS-VS

6.6 x 3.8 mm

$ 19.62

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2.85ct Red Rhodolite Garnet, Oval, VS

2.85ct Red Rhodolite Garnet, Oval, VS

9.1 x 8.2 mm

$ 76.41

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7.01ct Brown Smoky Quartz, Round, VVS-VS

7.01ct Brown Smoky Quartz, Round, VVS-VS

13 mm (calibrated)

$ 23.04

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5.65ctw Violet Amethyst, Oval, Transparent

5.65ctw Violet Amethyst, Oval, Transparent

10 x 8 mm (calibrated)

$ 30.96

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0.91ct Yellow Citrine, Oval, Transparent

0.91ct Yellow Citrine, Oval, Transparent

10.2 x 4.2 mm

$ 5.29

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5.05ctw Multicolor Pietersite, Round, Opaque

5.05ctw Multicolor Pietersite, Round, Opaque

11 mm (calibrated)

$ 11.82

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0.85ct Orange Hessonite Garnet, Cushion, SI

0.85ct Orange Hessonite Garnet, Cushion, SI

5 x 5 mm (calibrated)

$ 16.77

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1.02ct Multicolor Opal, Oval, Translucent

1.02ct Multicolor Opal, Oval, Translucent

8.6 x 6.8 mm

$ 32.08

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11.97ct Multicolor Jasper, Fancy, Opaque

11.97ct Multicolor Jasper, Fancy, Opaque

22.3 x 12.9 mm

$ 19.68

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2.20ctw Red Pyrope Garnet, Marquise, VVS-VS

2.20ctw Red Pyrope Garnet, Marquise, VVS-VS

9.9 x 5.1 mm

$ 19.28

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0.70ct Green Peridot, Oval, VS

0.70ct Green Peridot, Oval, VS

7 x 5 mm (calibrated)

$ 9.76

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10.56ctw Green Prehnite, Fancy, Translucent

10.56ctw Green Prehnite, Fancy, Translucent

15.2 x 10.9 mm

$ 17.35

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1.25ct Gray Cat'S Eye Alexandrite, Oval, Opaque

1.25ct Gray Cat'S Eye Alexandrite, Oval, Opaque

6.7 x 4.2 mm

$ 259.38

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10.11ct Red Strawberry Quartz, Oval, Translucent

10.11ct Red Strawberry Quartz, Oval, Translucent

15.8 x 13 mm

$ 77.54

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14.01ct Multicolor Agate, Round, Opaque

14.01ct Multicolor Agate, Round, Opaque

17 mm (calibrated)

$ 23.72

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2.18ctw Yellow Citrine, Square, VVS-VS

2.18ctw Yellow Citrine, Square, VVS-VS

6 x 6 mm (calibrated)

$ 16.72

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2.23ct Orange Hessonite Garnet, Cushion, VS-SI

2.23ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 43.97

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12.85ct White Rainbow Moonstone, Fancy, Transparent

12.85ct White Rainbow Moonstone, Fancy, Transparent

22.6 x 10 mm

$ 102.39

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3.27ct Multicolor Opal, Cushion, Transparent

3.27ct Multicolor Opal, Cushion, Transparent

15.7 x 7.3 mm

$ 82.20

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0.86ct Orange Hessonite Garnet, Cushion, SI

0.86ct Orange Hessonite Garnet, Cushion, SI

5 x 5 mm (calibrated)

$ 16.97

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3.82ctw Violet Amethyst, Oval, VVS-VS

3.82ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 20.92

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0.84ct Yellow Morganite, Pear Shape, VVS-VS

0.84ct Yellow Morganite, Pear Shape, VVS-VS

8 x 6 mm (calibrated)

$ 36.81

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0.36ct Orange Spessartite Garnet, Oval, VS

0.36ct Orange Spessartite Garnet, Oval, VS

5.1 x 3.2 mm

$ 12.55

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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 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

Overall Rating -> 10 star ratings

Gem Select has a user friendly website and the product is very good as is the price. The gems are described accurately and I always get what I think I'm getting.

Posted By Happy Customer in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Had a great experience and the prices are great

Posted By BuBx99 in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Good, hope gem quality is good and genuine

Posted By Varun in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

The stones are very nice.

Posted By Mvk in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

It's mostly good, only some item's are easier to find through the search than the menu

Posted By Wayne in July, 2025
Source: Bizrate
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