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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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3.61ctw Yellow Sphene, Oval, Transparent

3.61ctw Yellow Sphene, Oval, Transparent

7.7 x 6.5 mm

$ 17.98

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1.13ct Purple Spinel, Cushion, VVS-VS
Spinel Product Video (720487)

1.13ct Purple Spinel, Cushion, VVS-VS

6.4 x 5.8 mm

$ 168.82

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3.48ctw White Rainbow Moonstone, Pear Shape, Transparent

3.48ctw White Rainbow Moonstone, Pear Shape, Transparent

5 x 5 mm (calibrated)

$ 64.97

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1.35ct Multicolor Opal, Marquise, Transparent

1.35ct Multicolor Opal, Marquise, Transparent

16.1 x 5.8 mm

$ 60.51

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2.06ct Orange Hessonite Garnet, Oval, VS

2.06ct Orange Hessonite Garnet, Oval, VS

8.4 x 7 mm

$ 36.65

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3.05ct Violet Amethyst, Marquise, VVS

3.05ct Violet Amethyst, Marquise, VVS

15.2 x 7.2 mm

$ 21.26

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14.03ct Multicolor Agate, Round, Opaque

14.03ct Multicolor Agate, Round, Opaque

14 mm (calibrated)

$ 13.28

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1.66ct Green Tourmaline, Emerald Cut, SI

1.66ct Green Tourmaline, Emerald Cut, SI

18 x 3.3 mm

$ 40.01

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31.45ct Multicolor Jasper, Pear Shape, Opaque

31.45ct Multicolor Jasper, Pear Shape, Opaque

31.8 x 21.3 mm

$ 21.70

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19.30ctw Multicolor Pietersite, Oval, Opaque

19.30ctw Multicolor Pietersite, Oval, Opaque

23.8 x 13.2 mm

$ 45.18

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1.62ct Multicolor Pietersite, Oval, Opaque

1.62ct Multicolor Pietersite, Oval, Opaque

10 x 7 mm (calibrated)

$ 3.83

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1.36ctw Red Pyrope Garnet, Square, VVS-VS

1.36ctw Red Pyrope Garnet, Square, VVS-VS

5 x 5 mm (calibrated)

$ 10.42

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35.76ct Purple Ruby-Zoisite, Flower Cut, Opaque

35.76ct Purple Ruby-Zoisite, Flower Cut, Opaque

20.9 x 20.1 mm

$ 43.46

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4.23ct Pink Strawberry Quartz, Oval, Transparent

4.23ct Pink Strawberry Quartz, Oval, Transparent

11 x 9 mm (calibrated)

$ 32.44

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2.58ct Yellow Rutile Quartz, Pear Shape, Transparent

2.58ct Yellow Rutile Quartz, Pear Shape, Transparent

10 x 7 mm (calibrated)

$ 6.96

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40.21ct White Rainbow Moonstone, Fancy, Opaque

40.21ct White Rainbow Moonstone, Fancy, Opaque

38.4 x 12.5 mm

$ 3.34

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2.09ct Orange Moonstone, Square, Translucent

2.09ct Orange Moonstone, Square, Translucent

7 x 7 mm (calibrated)

$ 4.18

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4.11ct Yellow Citrine, Oval, VVS

4.11ct Yellow Citrine, Oval, VVS

12 x 10 mm (calibrated)

$ 32.75

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2.33ct Yellow Citrine, Pear Shape, VVS-VS

2.33ct Yellow Citrine, Pear Shape, VVS-VS

13.6 x 6.9 mm

$ 17.87

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1.25ctw Yellow Color-Change Diaspore, Cushion, VS

1.25ctw Yellow Color-Change Diaspore, Cushion, VS

5.2 x 4.6 mm

$ 65.99

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1.40ct Orange Hessonite Garnet, Cushion, VS-SI

1.40ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 24.71

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4.34ct Yellow Citrine, Oval, VVS-VS

4.34ct Yellow Citrine, Oval, VVS-VS

12 x 10 mm (calibrated)

$ 34.58

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1.53ctw Yellow Citrine, Oval, Transparent

1.53ctw Yellow Citrine, Oval, Transparent

10 x 4.1 mm

$ 11.74

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1.03ct Red Rhodolite Garnet, Pear Shape, VS-SI

1.03ct Red Rhodolite Garnet, Pear Shape, VS-SI

7 x 5 mm (calibrated)

$ 27.36

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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

The stones are very nice.

Posted By Mvk in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I had a very easy time navigating the web page and using filters to find what I was looking for. The varied selection was nice to see and pricing is clear and fair.

Posted By Mattick in May, 2026
Source: Bizrate

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

Absolutely love Gem Select. I always know the quality and accuracy of information and photos are top notch. Highly recommend!

Posted By Matthew K. in May, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Everything was good, the purchase was what I expected and what they show is what you get.

Posted By Mr. in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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