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Untreated Gemstones

Browse our selection of untreated gemstones featuring natural color, clarity and beauty without enhancements.

Untreated Gemstones Weight
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Yellow Untreated Gemstones
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1.00ct Yellow Color-Change Diaspore, Cushion, VVS-VS

1.00ct Yellow Color-Change Diaspore, Cushion, VVS-VS

6.1 x 5.1 mm

$ 52.79

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4.83ct Yellow Citrine, Emerald Cut, VVS-VS

4.83ct Yellow Citrine, Emerald Cut, VVS-VS

11 x 9 mm (calibrated)

$ 37.04

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4.46ct Yellow Citrine, Emerald Cut, VVS-VS

4.46ct Yellow Citrine, Emerald Cut, VVS-VS

11 x 9 mm (calibrated)

$ 34.20

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7.43ctw Violet Amethyst, Oval, Transparent

7.43ctw Violet Amethyst, Oval, Transparent

11 x 9 mm (calibrated)

$ 33.92

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19.18ct Multicolor Agate, Oval, Opaque

19.18ct Multicolor Agate, Oval, Opaque

17.4 x 15.9 mm

$ 32.48

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1.17ctw Orange Zircon, Oval, VVS-VS

1.17ctw Orange Zircon, Oval, VVS-VS

5.2 x 4 mm

$ 29.13

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6.65ct Multicolor Fire Agate, Oval, Opaque

6.65ct Multicolor Fire Agate, Oval, Opaque

14 x 12 mm (calibrated)

$ 51.59

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2.87ct Violet Amethyst, Trillion, VVS

2.87ct Violet Amethyst, Trillion, VVS

10 x 10 mm (calibrated)

$ 20.01

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1.89ct Pink Tourmaline, Oval, Transparent

1.89ct Pink Tourmaline, Oval, Transparent

9 x 7 mm (calibrated)

$ 32.40

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80.59ct Pink Rose Quartz, Oval, Transparent

80.59ct Pink Rose Quartz, Oval, Transparent

35.3 x 25.8 mm

$ 176.59

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8.09ct Yellow Rutile Quartz, Oval, Transparent

8.09ct Yellow Rutile Quartz, Oval, Transparent

15.1 x 11 mm

$ 22.16

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10.47ct Multicolor Agate, Oval, Opaque

10.47ct Multicolor Agate, Oval, Opaque

14.8 x 12.7 mm

$ 9.91

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0.75ct Yellow Color-Change Diaspore, Emerald Cut, VS-SI

0.75ct Yellow Color-Change Diaspore, Emerald Cut, VS-SI

5.6 x 4.2 mm

$ 19.90

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2.14ctw Multicolor Andalusite, Round, VS

2.14ctw Multicolor Andalusite, Round, VS

4 mm (calibrated)

$ 105.51

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0.98ct Green Tourmaline, Emerald Cut, VS

0.98ct Green Tourmaline, Emerald Cut, VS

8.6 x 4.3 mm

$ 24.40

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34.61ct Multicolor Opal, Pear Shape, Opaque

34.61ct Multicolor Opal, Pear Shape, Opaque

33.4 x 24.3 mm

$ 103.42

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10.37ct White Rainbow Moonstone, Pear Shape, Transparent

10.37ct White Rainbow Moonstone, Pear Shape, Transparent

18.3 x 12.2 mm

$ 185.91

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3.07ct Violet Amethyst, Trillion, VS

3.07ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 21.41

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1.29ct Yellow Citrine, Cushion, VVS

1.29ct Yellow Citrine, Cushion, VVS

8 x 6 mm (calibrated)

$ 9.64

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0.64ct Green Tourmaline, Round, Transparent

0.64ct Green Tourmaline, Round, Transparent

5 mm (calibrated)

$ 12.75

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2.45ct Green Tourmaline, Emerald Cut, VVS

2.45ct Green Tourmaline, Emerald Cut, VVS

24.5 x 3.6 mm

$ 61.01

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2.08ctw Yellow Morganite, Oval, VVS

2.08ctw Yellow Morganite, Oval, VVS

8 x 6 mm (calibrated)

$ 124.30

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6.18ct Brown Tiger'S Eye, Baguette, Opaque

6.18ct Brown Tiger'S Eye, Baguette, Opaque

12 x 10 mm (calibrated)

$ 3.39

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10.55ctw Green Prehnite, Fancy, Translucent

10.55ctw Green Prehnite, Fancy, Translucent

15.5 x 10.8 mm

$ 17.33

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

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

The site provided lots of detail, factual data, and good photos. I also like the availability of searching by price range as well as by the type of stone.

Posted By SLIntuitive Donna in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Enjoy every moment

Posted By Ferns in October, 2025
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

Very large selection from affordable to high end I will be coming back to shop again!

Posted By GreenGator in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

easy site to navigate

Posted By Curt's Cabochons in June, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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