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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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Untreated Gemstones Treatment

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Yellow Untreated Gemstones
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7.19ctw Black Spinel, Round, Opaque

7.19ctw Black Spinel, Round, Opaque

9 mm (calibrated)

$ 23.64

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15.99ctw Green Seraphinite, Baguette, Opaque

15.99ctw Green Seraphinite, Baguette, Opaque

14 x 10 mm (calibrated)

$ 26.44

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39.70ct Multicolor Amethyst Geode Slice, Fancy, Transparent
Amethyst Geode Slice Product Video (684515)

39.70ct Multicolor Amethyst Geode Slice, Fancy, Transparent

29.4 x 28.2 mm

$ 42.31

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9.29ctw Multicolor Pietersite, Round, Opaque

9.29ctw Multicolor Pietersite, Round, Opaque

14 mm (calibrated)

$ 22.76

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39.54ct Brown Tiger'S Eye Matrix, Oval, Opaque

39.54ct Brown Tiger'S Eye Matrix, Oval, Opaque

30 x 22 mm (calibrated)

$ 39.38

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0.93ct Yellow Color-Change Diaspore, Emerald Cut, VS

0.93ct Yellow Color-Change Diaspore, Emerald Cut, VS

7.7 x 4.7 mm

$ 48.66

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3.03ct Yellow Citrine, Oval, VVS-VS

3.03ct Yellow Citrine, Oval, VVS-VS

11 x 9 mm (calibrated)

$ 21.12

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3.60ctw Multicolor Andalusite, Round, VS

3.60ctw Multicolor Andalusite, Round, VS

3.5 mm (calibrated)

$ 158.12

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4.86ct Green Tourmaline, Fancy, Translucent

4.86ct Green Tourmaline, Fancy, Translucent

14.6 x 8.7 mm

$ 53.24

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5.35ctw Violet Amethyst, Trillion, VVS-VS

5.35ctw Violet Amethyst, Trillion, VVS-VS

10 x 10 mm (calibrated)

$ 37.30

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38.60ct Pink Rose Quartz, Oval, Transparent

38.60ct Pink Rose Quartz, Oval, Transparent

24.1 x 19.2 mm

$ 50.75

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0.76ctw White Rainbow Moonstone, Oval, Transparent

0.76ctw White Rainbow Moonstone, Oval, Transparent

6 x 4 mm (calibrated)

$ 20.82

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8.54ctw Green Amazonite, Round, Opaque

8.54ctw Green Amazonite, Round, Opaque

8 mm (calibrated)

$ 20.86

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6.27ct Green Prehnite, Fancy, Translucent

6.27ct Green Prehnite, Fancy, Translucent

16 x 12 mm (calibrated)

$ 10.30

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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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1.81ctw Red Pyrope Garnet, Heart, VVS-VS

1.81ctw Red Pyrope Garnet, Heart, VVS-VS

6 x 6 mm (calibrated)

$ 13.89

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32.47ctw Multicolor Rhodochrosite, Oval, Translucent
Rhodochrosite Product Video (503366)

32.47ctw Multicolor Rhodochrosite, Oval, Translucent

26.2 x 12.3 mm

$ 26.68

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1.31ct Multicolor Labradorite, Oval, Translucent

1.31ct Multicolor Labradorite, Oval, Translucent

7.1 x 6.2 mm

$ 2.61

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2.58ctw Red Pyrope Garnet, Marquise, VVS-VS

2.58ctw Red Pyrope Garnet, Marquise, VVS-VS

10.1 x 5.1 mm

$ 22.61

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23.36ct Green Aventurine, Round, Translucent

23.36ct Green Aventurine, Round, Translucent

24.7 mm

$ 23.26

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1.51ct Yellow Tourmaline, Oval, VVS-VS

1.51ct Yellow Tourmaline, Oval, VVS-VS

7.2 x 6.7 mm

$ 175.46

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1.39ct Blue Cavansite, Fancy, Opaque

1.39ct Blue Cavansite, Fancy, Opaque

9.1 x 7.6 mm

$ 8.08

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2.11ct White Moonstone, Oval, Translucent

2.11ct White Moonstone, Oval, Translucent

9 x 7 mm (calibrated)

$ 18.49

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29.09ctw Multicolor Fossil Coral, Cushion, Opaque

29.09ctw Multicolor Fossil Coral, Cushion, Opaque

20.5 x 13.2 mm

$ 36.34

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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

Easy to use website

Posted By Mel in February, 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 can pick and choose from large selection and find just what I need for .y projects, currently my cane.

Posted By Darkstar731 in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The citrine gems are beautiful. I appreciated that each stone was individually shown on the website so I could see exactly what I was getting. No mystery person selecting random stones for me. The documentation included with each gem was high quality as well. Great price and arrived as expected.

Posted By Jen in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

hassle free experience.

Posted By Jhidron in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Excellent options

Posted By CJ in February, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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