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Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
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17.97ct Multicolor Pietersite, Oval, Opaque
Pietersite Product Video (687416)

17.97ct Multicolor Pietersite, Oval, Opaque

23.1 x 15.6 mm

$ 44.03

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3.05ct Violet Amethyst, Trillion, VVS-VS

3.05ct Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 24.30

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2.98ct Multicolor Opal, Trillion, Transparent
Opal Product Video (691103)

2.98ct Multicolor Opal, Trillion, Transparent

11.6 x 11.1 mm

$ 133.56

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2.30ct Yellow Citrine, Flower Cut, Transparent

2.30ct Yellow Citrine, Flower Cut, Transparent

8 x 8 mm (calibrated)

$ 17.64

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1.17ct Blue Kyanite, Oval, SI

1.17ct Blue Kyanite, Oval, SI

7 x 5 mm (calibrated)

$ 29.13

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1.31ct Yellow Color-Change Diaspore, Emerald Cut, VVS

1.31ct Yellow Color-Change Diaspore, Emerald Cut, VVS

10.2 x 4.1 mm

$ 69.16

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2.64ct Pink Tourmaline, Emerald Cut, VS-SI

2.64ct Pink Tourmaline, Emerald Cut, VS-SI

10.1 x 6.4 mm

$ 199.58

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1.00ct Green Tourmaline, Round, Transparent

1.00ct Green Tourmaline, Round, Transparent

6 mm (calibrated)

$ 17.14

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2.32ct Turquoise Fluorite, Pear Shape, Transparent

2.32ct Turquoise Fluorite, Pear Shape, Transparent

9 x 6.4 mm

$ 9.25

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0.74ctw Yellow Citrine, Oval, VS

0.74ctw Yellow Citrine, Oval, VS

6 x 4 mm (calibrated)

$ 4.86

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6.38ctw Green Prehnite, Oval, Transparent

6.38ctw Green Prehnite, Oval, Transparent

7.5 x 6.8 mm

$ 40.78

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3.75ct Pink Rose Quartz, Emerald Cut, Transparent

3.75ct Pink Rose Quartz, Emerald Cut, Transparent

10 x 10 mm (calibrated)

$ 20.55

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4.20ct Multicolor Pietersite, Pear Shape, Opaque

4.20ct Multicolor Pietersite, Pear Shape, Opaque

16.6 x 10.3 mm

$ 12.55

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5.17ct Violet Amethyst, Pear Shape, Transparent

5.17ct Violet Amethyst, Pear Shape, Transparent

14 x 10 mm (calibrated)

$ 30.89

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2.74ctw White Rainbow Moonstone, Square, Transparent
Rainbow Moonstone Product Video (350492)

2.74ctw White Rainbow Moonstone, Square, Transparent

3 x 3 mm (calibrated)

$ 51.93

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2.54ctw Red Pyrope Garnet, Marquise, VVS-VS

2.54ctw Red Pyrope Garnet, Marquise, VVS-VS

10 x 5 mm

$ 22.26

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6.16ct Violet Amethyst, Heart, Transparent

6.16ct Violet Amethyst, Heart, Transparent

14.5 x 13.1 mm

$ 30.68

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13.99ct Blue Color-Change Fluorite, Round, VS

13.99ct Blue Color-Change Fluorite, Round, VS

15 mm (calibrated)

$ 306.55

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3.88ctw White Topaz, Square, VVS-VS

3.88ctw White Topaz, Square, VVS-VS

4 x 4 mm (calibrated)

$ 31.24

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2.01ct Purple Kunzite, Emerald Cut, VS

2.01ct Purple Kunzite, Emerald Cut, VS

7.4 x 5.7 mm

$ 55.32

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2.35ctw Violet Amethyst, Oval, VS

2.35ctw Violet Amethyst, Oval, VS

6 x 4 mm (calibrated)

$ 12.88

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7.00ctw Yellow Citrine, Pear Shape, VVS-VS

7.00ctw Yellow Citrine, Pear Shape, VVS-VS

12 x 10 mm (calibrated)

$ 54.68

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1.56ct Green Sphene, Oval, Transparent

1.56ct Green Sphene, Oval, Transparent

7 x 6 mm

$ 8.55

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1.22ct Yellow Color-Change Diaspore, Pear Shape, VVS

1.22ct Yellow Color-Change Diaspore, Pear Shape, VVS

12.8 x 4.4 mm

$ 42.77

View Gem
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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

My whole experience is great.

Posted By Ghs in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.

Posted By Debsarabs in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

IT WAS GREAT SIMPLE I WAS ABLE TO MAKE AN ACCOUNT EASY AND WAS ABLE TO FAVORITE ALL OF MY FINAL SELECTED GEMS, I JUST LOVE IT.

Posted By YE in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Loved the price and the quality and the certification options which is the main reason why I buy. The guarantee is also a great reason to use gem select.

Posted By Sal in July, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Will know more once order received

Posted By Jim in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very good place to buy gemstones

Posted By Elansary in March, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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