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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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8.24ct Black Tourmaline, Oval, Opaque

8.24ct Black Tourmaline, Oval, Opaque

14.3 x 11.3 mm

$ 41.04

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4.62ctw Green Prehnite, Oval, Transparent

4.62ctw Green Prehnite, Oval, Transparent

8 x 7.3 mm

$ 29.71

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4.67ct Violet Amethyst, Pear Shape, VVS

4.67ct Violet Amethyst, Pear Shape, VVS

15 x 10 mm (calibrated)

$ 35.81

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2.04ctw Pink Strawberry Quartz, Round, Transparent

2.04ctw Pink Strawberry Quartz, Round, Transparent

6.5 mm (calibrated)

$ 31.29

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0.47ct Violet Spinel, Round, VVS-VS

0.47ct Violet Spinel, Round, VVS-VS

5 mm (calibrated)

$ 23.56

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0.74ct Yellow Citrine, Heart, VVS-VS

0.74ct Yellow Citrine, Heart, VVS-VS

6 x 6 mm (calibrated)

$ 5.16

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0.99ct Green Sphene, Oval, Transparent

0.99ct Green Sphene, Oval, Transparent

5.9 x 5.6 mm

$ 5.43

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1.26ct Orange Hessonite Garnet, Cushion, VS-SI

1.26ct Orange Hessonite Garnet, Cushion, VS-SI

6 x 6 mm (calibrated)

$ 19.71

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5.19ct Yellow Apatite, Cushion, VS
Apatite Product Video (391067)

5.19ct Yellow Apatite, Cushion, VS

10.5 x 10.4 mm

$ 278.28

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19.64ct Violet Amethyst, Flower Cut, Translucent

19.64ct Violet Amethyst, Flower Cut, Translucent

18 x 17.5 mm

$ 64.55

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36.81ct Pink Star Rose Quartz, Oval, Translucent

36.81ct Pink Star Rose Quartz, Oval, Translucent

20 x 15 mm (calibrated)

$ 61.10

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0.75ct Orange Fire Opal, Oval, Translucent

0.75ct Orange Fire Opal, Oval, Translucent

8 x 6 mm (calibrated)

$ 18.68

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13.82ct Bi-Color Tourmaline, Fancy, Transparent
Tourmaline Product Video (737844)

13.82ct Bi-Color Tourmaline, Fancy, Transparent

18.6 x 17.7 mm

$ 344.12

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1.06ct Orange Zircon, Oval, VVS-VS

1.06ct Orange Zircon, Oval, VVS-VS

6 x 4.9 mm

$ 26.39

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2.46ct Red Almandine Garnet, Oval, VS

2.46ct Red Almandine Garnet, Oval, VS

9 x 7 mm (calibrated)

$ 91.88

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1.26ctw Red Pyrope Garnet, Heart, VS

1.26ctw Red Pyrope Garnet, Heart, VS

5 x 5 mm (calibrated)

$ 31.37

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36.54ctw Gray Hematite, Baguette, Opaque

36.54ctw Gray Hematite, Baguette, Opaque

17.1 x 12.9 mm

$ 35.62

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0.53ctw Orange Spessartite Garnet, Oval, VS-SI

0.53ctw Orange Spessartite Garnet, Oval, VS-SI

4.1 x 3.2 mm

$ 18.48

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6.15ct Multicolor Rainbow Pyrite, Square, Opaque

6.15ct Multicolor Rainbow Pyrite, Square, Opaque

12 x 12 mm (calibrated)

$ 15.93

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0.27ct Orange Sphalerite, Round, SI

0.27ct Orange Sphalerite, Round, SI

3.7 mm

$ 13.45

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6.34ct Multicolor Fire Agate, Fancy, Opaque

6.34ct Multicolor Fire Agate, Fancy, Opaque

21.5 x 7.8 mm

$ 53.83

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2.19ct Orange Moonstone, Square, Translucent

2.19ct Orange Moonstone, Square, Translucent

7 x 7 mm (calibrated)

$ 4.34

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44.54ct Multicolor Jasper, Oval, Opaque

44.54ct Multicolor Jasper, Oval, Opaque

31 x 23.8 mm

$ 48.80

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0.97ct Green Tourmaline, Round, Transparent

0.97ct Green Tourmaline, Round, Transparent

6 mm (calibrated)

$ 16.08

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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

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
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Overall Rating -> 10 star ratings

Easy and functional

Posted By Dessa in March, 2026
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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
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Overall Rating -> 10 star ratings

My experience was done with ease

Posted By Barb in October, 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

I have purchased stones from gem select in the past and have been very satisfied. I expect to repeat that experience with this purchase as well

Posted By Marti in July, 2025
Source: Bizrate
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