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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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1.06ct Purple Spinel, Cushion, VS

1.06ct Purple Spinel, Cushion, VS

6.6 x 4.9 mm

$ 105.58

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0.59ct Red Pyrope Garnet, Heart, VS

0.59ct Red Pyrope Garnet, Heart, VS

5 x 5 mm (calibrated)

$ 14.69

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1.82ctw Green Tsavorite Garnet, Baguette, VS

1.82ctw Green Tsavorite Garnet, Baguette, VS

3.9 x 2 mm

$ 109.67

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1.76ct Orange Hessonite Garnet, Oval, VS

1.76ct Orange Hessonite Garnet, Oval, VS

7.5 x 5.9 mm

$ 35.06

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1.55ct Pink Tourmaline, Emerald Cut, VVS-VS

1.55ct Pink Tourmaline, Emerald Cut, VVS-VS

7.6 x 5.9 mm

$ 101.89

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2.65ctw Red Rhodolite Garnet, Square, VS

2.65ctw Red Rhodolite Garnet, Square, VS

4.9 x 4.8 mm

$ 23.20

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2.63ctw Green Prehnite, Round, Transparent

2.63ctw Green Prehnite, Round, Transparent

6.5 mm (calibrated)

$ 14.28

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16.83ct Violet Amethyst, Pear Shape, VVS

16.83ct Violet Amethyst, Pear Shape, VVS

20.6 x 16.1 mm

$ 134.10

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23.24ctw White Dendritic Agate, Pear Shape, Opaque

23.24ctw White Dendritic Agate, Pear Shape, Opaque

20 x 15 mm (calibrated)

$ 18.52

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1.55ct Multicolor Opal, Pear Shape, Translucent

1.55ct Multicolor Opal, Pear Shape, Translucent

10 x 8 mm (calibrated)

$ 35.67

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14.86ctw Black Spinel, Round, Opaque

14.86ctw Black Spinel, Round, Opaque

12 mm (calibrated)

$ 48.85

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40.93ct Violet Amethyst, Oval, VVS-VS

40.93ct Violet Amethyst, Oval, VVS-VS

22.6 x 18.4 mm

$ 271.78

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1.30ct Purple Rhodolite Garnet, Oval, VS

1.30ct Purple Rhodolite Garnet, Oval, VS

7 x 5 mm (calibrated)

$ 34.53

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2.18ct Yellow Citrine, Oval, VVS

2.18ct Yellow Citrine, Oval, VVS

13.9 x 7 mm

$ 15.20

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11.76ct Multicolor Pietersite, Cushion, Opaque

11.76ct Multicolor Pietersite, Cushion, Opaque

17.9 x 14.6 mm

$ 28.82

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7.36ct Multicolor Rainbow Pyrite, Heart, Opaque

7.36ct Multicolor Rainbow Pyrite, Heart, Opaque

17.1 x 15.7 mm

$ 18.98

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1.55ct Blue Kyanite, Oval, SI

1.55ct Blue Kyanite, Oval, SI

8 x 6 mm (calibrated)

$ 32.27

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5.68ct Pink Rose Quartz, Emerald Cut, Transparent

5.68ct Pink Rose Quartz, Emerald Cut, Transparent

11 x 11 mm (calibrated)

$ 31.12

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27.44ctw Multicolor Coral, Oval, Opaque

27.44ctw Multicolor Coral, Oval, Opaque

22.1 x 13.6 mm

$ 52.01

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1.01ctw Violet Amethyst, Marquise, VS

1.01ctw Violet Amethyst, Marquise, VS

8 x 4 mm (calibrated)

$ 6.71

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0.93ctw Orange Spessartite Garnet, Oval, VS

0.93ctw Orange Spessartite Garnet, Oval, VS

5 x 4 mm (calibrated)

$ 32.42

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0.93ct Orange Hessonite Garnet, Pear Shape, VS-SI

0.93ct Orange Hessonite Garnet, Pear Shape, VS-SI

7.5 x 5.4 mm

$ 20.38

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1.91ct Orange Spessartite Garnet, Oval, Transparent

1.91ct Orange Spessartite Garnet, Oval, Transparent

8.1 x 6.9 mm

$ 47.56

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0.91ct Yellow Sphalerite, Oval, VS-SI

0.91ct Yellow Sphalerite, Oval, VS-SI

5.7 x 4.7 mm

$ 45.32

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

Very good.

Posted By Tommy in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
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

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 -> 10 star ratings

I could see the actual gem I was buying

Posted By Bugs in December, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

Site worked well and helped me find a rock that matched what I was looking for. Well within budget and I trust it will show up, so that's definitely positive. Not much else to it. Satisfied.

Posted By Big Ricky in May, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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