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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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25.87ct White Rainbow Moonstone, Fancy, Transparent
Rainbow Moonstone Product Video (683078)

25.87ct White Rainbow Moonstone, Fancy, Transparent

33.3 x 12.8 mm

$ 206.13

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1.95ctw Yellow Citrine, Square, VVS-VS

1.95ctw Yellow Citrine, Square, VVS-VS

6 x 6 mm (calibrated)

$ 13.60

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0.06ct Black Diamond, Round, Opaque

0.06ct Black Diamond, Round, Opaque

2.5 mm (calibrated)

$ 29.03

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1.10ct Orange Moonstone, Pear Shape, Transparent

1.10ct Orange Moonstone, Pear Shape, Transparent

9 x 6 mm (calibrated)

$ 2.19

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23.04ctw Multicolor Fossil Coral, Fancy, Opaque

23.04ctw Multicolor Fossil Coral, Fancy, Opaque

21.3 x 12.8 mm

$ 25.24

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19.53ct Purple Ruby-Zoisite, Flower Cut, Opaque

19.53ct Purple Ruby-Zoisite, Flower Cut, Opaque

16.4 x 15.1 mm

$ 23.74

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2.22ct Orange Moonstone, Square, Translucent

2.22ct Orange Moonstone, Square, Translucent

7 x 7 mm (calibrated)

$ 4.44

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4.94ct Yellow Apatite, Emerald Cut, VS
Apatite Product Video (439317)

4.94ct Yellow Apatite, Emerald Cut, VS

10 x 10 mm (calibrated)

$ 254.38

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2.54ct Blue Chalcedony, Oval, Transparent

2.54ct Blue Chalcedony, Oval, Transparent

10 x 8 mm (calibrated)

$ 5.06

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5.57ct Multicolor Fire Agate, Pear Shape, Opaque

5.57ct Multicolor Fire Agate, Pear Shape, Opaque

13.5 x 9.7 mm

$ 47.18

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3.48ct Yellow Citrine, Oval, VVS-VS

3.48ct Yellow Citrine, Oval, VVS-VS

11 x 9 mm (calibrated)

$ 24.26

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5.92ctw Pink Strawberry Quartz, Oval, Transparent

5.92ctw Pink Strawberry Quartz, Oval, Transparent

11 x 9 mm (calibrated)

$ 44.41

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1.76ctw Violet Amethyst, Heart, Transparent

1.76ctw Violet Amethyst, Heart, Transparent

6.3 x 6.1 mm

$ 13.50

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21.52ct White Howlite, Fancy, Opaque

21.52ct White Howlite, Fancy, Opaque

27 x 20 mm (calibrated)

$ 10.29

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4.99ct Multicolor Agate, Oval, Opaque

4.99ct Multicolor Agate, Oval, Opaque

11.2 x 10.5 mm

$ 8.45

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3.79ctw Brown Smoky Quartz, Round, VS

3.79ctw Brown Smoky Quartz, Round, VS

8 mm (calibrated)

$ 20.77

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12.72ctw Black Spinel, Round, Opaque

12.72ctw Black Spinel, Round, Opaque

12 mm (calibrated)

$ 41.82

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0.69ct Yellow Tourmaline, Round, Transparent

0.69ct Yellow Tourmaline, Round, Transparent

5 mm (calibrated)

$ 13.74

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25.25ct Bi-Color Ametrine, Oval, VVS-VS

25.25ct Bi-Color Ametrine, Oval, VVS-VS

24.9 x 15.6 mm

$ 138.33

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12.14ct Purple Ruby-Zoisite, Flower Cut, Opaque

12.14ct Purple Ruby-Zoisite, Flower Cut, Opaque

14.8 x 14.2 mm

$ 14.75

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2.87ct Pink Tourmaline, Emerald Cut, VVS-VS

2.87ct Pink Tourmaline, Emerald Cut, VVS-VS

9.2 x 6.3 mm

$ 216.96

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0.61ct Orange Zircon, Oval, VVS

0.61ct Orange Zircon, Oval, VVS

5.2 x 4.2 mm

$ 9.11

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0.69ct Blue Kyanite, Round, SI

0.69ct Blue Kyanite, Round, SI

5 mm (calibrated)

$ 17.18

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2.42ct Orange Hessonite Garnet, Oval, VS

2.42ct Orange Hessonite Garnet, Oval, VS

8.9 x 7.4 mm

$ 53.03

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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

GemSelect offers excellent choices, prices & service- highly recommended! Unfortunately, prior to ordering a replacement gemstone, my jeweler neglected to mention it needed to be one that was a'cushion cuta' to fit the existing mount. Have yet to return/exchangea'

Posted By CJ in March, 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 -> 9 star ratings

If you have motion picture, then I will be more satisfied with.

Posted By Ray in November, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

I think therea's no problem

Posted By Napoleon in August, 2025
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

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
→ View All GemSelect Reviews on Bizrate
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