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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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Yellow Untreated Gemstones
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12.29ctw Multicolor Labradorite, Baguette, Transparent

12.29ctw Multicolor Labradorite, Baguette, Transparent

11 x 9 mm (calibrated)

$ 15.75

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0.70ct Pink Morganite, Pear Shape, VVS-VS

0.70ct Pink Morganite, Pear Shape, VVS-VS

7.4 x 5 mm

$ 42.18

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9.67ct Multicolor Coral, Pear Shape, Translucent

9.67ct Multicolor Coral, Pear Shape, Translucent

15.7 x 15 mm

$ 30.63

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0.67ct Multicolor Labradorite, Round, Translucent

0.67ct Multicolor Labradorite, Round, Translucent

5 mm (calibrated)

$ 1.63

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11.28ct Black Nuummite, Trillion, Opaque

11.28ct Black Nuummite, Trillion, Opaque

23.9 x 16.1 mm

$ 49.06

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1.07ct Green Tourmaline, Emerald Cut, VVS-VS

1.07ct Green Tourmaline, Emerald Cut, VVS-VS

15.2 x 3.2 mm

$ 35.17

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20.80ctw Multicolor Fossil Coral, Oval, Opaque

20.80ctw Multicolor Fossil Coral, Oval, Opaque

19.4 x 11.3 mm

$ 26.88

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2.54ctw Red Pyrope Garnet, Square, VS

2.54ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 19.48

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6.37ctw Violet Amethyst, Oval, Transparent

6.37ctw Violet Amethyst, Oval, Transparent

12 x 8 mm (calibrated)

$ 34.90

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2.60ctw Yellow Citrine, Trillion, VVS-VS

2.60ctw Yellow Citrine, Trillion, VVS-VS

6 x 6 mm (calibrated)

$ 19.94

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1.12ct Orange Hessonite Garnet, Baguette, SI

1.12ct Orange Hessonite Garnet, Baguette, SI

6.2 x 4.5 mm

$ 24.54

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1.19ct Green Sphene, Oval, Transparent

1.19ct Green Sphene, Oval, Transparent

6.8 x 5.9 mm

$ 5.93

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9.37ct Black Tourmaline, Cushion, Opaque

9.37ct Black Tourmaline, Cushion, Opaque

14.4 x 11.5 mm

$ 33.32

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2.42ct Orange Hessonite Garnet, Emerald Cut, SI

2.42ct Orange Hessonite Garnet, Emerald Cut, SI

8.2 x 6.3 mm

$ 45.38

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8.44ct Bi-Color Ametrine, Oval, VVS

8.44ct Bi-Color Ametrine, Oval, VVS

15.4 x 11.3 mm

$ 55.48

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6.30ctw Brown Smoky Quartz, Oval, VS

6.30ctw Brown Smoky Quartz, Oval, VS

11.5 x 9.1 mm

$ 27.61

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3.82ctw Red Pyrope Garnet, Marquise, VVS-VS

3.82ctw Red Pyrope Garnet, Marquise, VVS-VS

12.1 x 6 mm

$ 33.48

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2.98ct Violet Amethyst, Trillion, VS

2.98ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 20.77

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5.67ct Yellow Star Moonstone, Oval, Translucent
Star Moonstone Product Video (418376)

5.67ct Yellow Star Moonstone, Oval, Translucent

12 x 10 mm (calibrated)

$ 24.85

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1.01ct Green Peridot, Emerald Cut, VVS-VS

1.01ct Green Peridot, Emerald Cut, VVS-VS

7 x 5 mm (calibrated)

$ 15.09

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0.61ctw Blue Kyanite, Round, VS

0.61ctw Blue Kyanite, Round, VS

3.7 mm

$ 15.19

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2.38ct Orange Hessonite Garnet, Oval, VS-SI
Hessonite Garnet Product Video (663361)

2.38ct Orange Hessonite Garnet, Oval, VS-SI

8.9 x 7.4 mm

$ 47.41

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2.80ctw Green Tsavorite Garnet, Round, VS-SI
Tsavorite Garnet Product Video (389845)

2.80ctw Green Tsavorite Garnet, Round, VS-SI

2.4 mm (calibrated)

$ 217.47

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14.54ct Multicolor Boulder Opal, Fancy, Opaque

14.54ct Multicolor Boulder Opal, Fancy, Opaque

20 x 13.5 mm

$ 72.41

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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 had a very easy time navigating the web page and using filters to find what I was looking for. The varied selection was nice to see and pricing is clear and fair.

Posted By Mattick in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

It's always a pleasure doing business with Gem Select. Outstanding products ant very reasonable prices. Thank You One and All.

Posted By G.W. or Bakyow in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The citrine gems are beautiful. I appreciated that each stone was individually shown on the website so I could see exactly what I was getting. No mystery person selecting random stones for me. The documentation included with each gem was high quality as well. Great price and arrived as expected.

Posted By Jen in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I love the product and the details about each of them.

Posted By Love It! in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

My current project is something BLUE . Opal earrings with matching tennis bracelet for her wedding. The opals and sixty two sapphires VVS & VS are AMAZINGLY BEAUTIFUL. The private jewelers were impressed by the clarity and inclusion free of the sapphires . I want to say thank you for the High quality sapphires that I purchased for my daughtera's wedding.

Posted By My real name Dean or Wandering about in May, 2026
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
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