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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
Untreated Gemstones Clarity
Untreated Gemstones Price
Untreated Gemstones Treatment

Size Explained

Choose Size or Size Range
For Example: 6-7
For Example: 8-9
Bi-color Untreated Gemstones
Black Untreated Gemstones
Blue Untreated Gemstones
Brown Untreated Gemstones
Golden Untreated Gemstones
Gray Untreated Gemstones
Green Untreated Gemstones
Multicolor Untreated Gemstones
Orange Untreated Gemstones
Pink Untreated Gemstones
Purple Untreated Gemstones
Red Untreated Gemstones
Turquoise Untreated Gemstones
Violet Untreated Gemstones
White Untreated Gemstones
Yellow Untreated Gemstones
Single
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Lots
Faceted
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12.42ct White Rainbow Moonstone, Oval, Transparent

12.42ct White Rainbow Moonstone, Oval, Transparent

21.9 x 10 mm

$ 185.55

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2.12ct Orange Hessonite Garnet, Oval, VS

2.12ct Orange Hessonite Garnet, Oval, VS

9 x 7 mm (calibrated)

$ 32.39

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17.81ct White Rainbow Moonstone, Oval, Transparent
Rainbow Moonstone Product Video (673892)

17.81ct White Rainbow Moonstone, Oval, Transparent

22.3 x 13.3 mm

$ 266.08

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6.74ct Multicolor Fire Agate, Fancy, Opaque

6.74ct Multicolor Fire Agate, Fancy, Opaque

15.5 x 9.6 mm

$ 51.83

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6.14ct Violet Amethyst, Oval, Transparent

6.14ct Violet Amethyst, Oval, Transparent

14 x 10 mm (calibrated)

$ 35.92

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13.03ct Multicolor Boulder Opal, Cushion, Opaque

13.03ct Multicolor Boulder Opal, Cushion, Opaque

20 x 15 mm (calibrated)

$ 71.38

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0.04ct Black Diamond, Round, Opaque

0.04ct Black Diamond, Round, Opaque

2.1 mm (calibrated)

$ 13.70

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1.06ct Violet Amethyst, Marquise, Transparent

1.06ct Violet Amethyst, Marquise, Transparent

9.1 x 4.8 mm

$ 7.39

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6.02ct Brown Tiger'S Eye, Baguette, Opaque

6.02ct Brown Tiger'S Eye, Baguette, Opaque

12 x 10 mm (calibrated)

$ 3.30

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1.27ct Green Tourmaline, Emerald Cut, VS

1.27ct Green Tourmaline, Emerald Cut, VS

20.6 x 2.7 mm

$ 27.76

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3.00ct Multicolor Labradorite, Baguette, Translucent

3.00ct Multicolor Labradorite, Baguette, Translucent

9 x 7 mm (calibrated)

$ 3.44

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11.28ct Pink Rose Quartz, Emerald Cut, Transparent

11.28ct Pink Rose Quartz, Emerald Cut, Transparent

14 x 14 mm (calibrated)

$ 61.79

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1.32ct Gray Sillimanite Cat'S Eye, Oval, Transparent

1.32ct Gray Sillimanite Cat'S Eye, Oval, Transparent

8 x 6 mm (calibrated)

$ 4.17

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11.29ctw Brown Smoky Quartz, Emerald Cut, VS
Smoky Quartz Product Video (394697)

11.29ctw Brown Smoky Quartz, Emerald Cut, VS

11 x 11 mm (calibrated)

$ 61.85

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0.64ct Pink Spinel, Cushion, VS

0.64ct Pink Spinel, Cushion, VS

5.7 x 5.2 mm

$ 53.12

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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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1.86ct Blue Cavansite, Fancy, Opaque

1.86ct Blue Cavansite, Fancy, Opaque

9.8 x 8.5 mm

$ 10.81

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6.57ct Green Actinolite Cat'S Eye, Oval, Translucent

6.57ct Green Actinolite Cat'S Eye, Oval, Translucent

14.3 x 11.5 mm

$ 45.81

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73.93ct Multicolor Ruby-Zoisite, Oval, Opaque
Ruby-Zoisite Product Video (484042)

73.93ct Multicolor Ruby-Zoisite, Oval, Opaque

37.5 x 25.7 mm

$ 121.50

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5.01ctw Purple Rhodolite Garnet, Oval, VS
Rhodolite Garnet Product Video (500936)

5.01ctw Purple Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 106.53

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2.06ct Turquoise Grandidierite, Oval, Translucent

2.06ct Turquoise Grandidierite, Oval, Translucent

9 x 6 mm (calibrated)

$ 49.43

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1.71ct Green Tourmaline, Cushion, VVS-VS

1.71ct Green Tourmaline, Cushion, VVS-VS

8.4 x 6.5 mm

$ 198.70

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9.02ct Brown Star Moonstone, Round, Translucent
Star Moonstone Product Video (420981)

9.02ct Brown Star Moonstone, Round, Translucent

13 mm (calibrated)

$ 29.65

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7.65ct Violet Amethyst, Fancy, Transparent

7.65ct Violet Amethyst, Fancy, Transparent

14 x 12 mm (calibrated)

$ 45.72

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

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Have made 2 purchases so far from GemSelect and they have been amazing! Anytime I requested additional info, videos or pictures of a particular item, the response was always timely and helpful. This is a great place to buy, if you are looking for loose stones. Highly recommend!

Posted By Britnee Rose in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I purchased from you before and I have never been disappointed. I always received what I expected and your products are very nice.

Posted By MVK in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Over pretty well experience the your website no complaints about it very easy reliable service provided

Posted By Blas in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I have shopped at Gemselect for nearly 20 years. I especially like that you see pictures of the exact gem you are purchasing. You are a trusted source.

Posted By DNaber in October, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

First time using this website. It was both exciting finding things in my price range and things Iam gonna save up for and use in other pieces. I love that the picture of the gem is the exact gem I'll be buying. I haven't tested the gems yes but they said they sold me 100% natural gems.

Posted By Salvo in July, 2025
Source: Bizrate
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