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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
Untreated Gemstones Clarity
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Yellow Untreated Gemstones
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0.17ct Yellow Diamond, Round, VS
Diamond Product Video (543902)

0.17ct Yellow Diamond, Round, VS

3.5 mm (calibrated)

$ 306.68

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11.29ctw Pink Morganite, Oval, Translucent

11.29ctw Pink Morganite, Oval, Translucent

15 x 9.1 mm

$ 123.69

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3.90ct Pink Tourmaline, Emerald Cut, VS-SI

3.90ct Pink Tourmaline, Emerald Cut, VS-SI

11.6 x 5.8 mm

$ 160.23

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10.11ct Yellow Rutile Quartz, Round, Transparent

10.11ct Yellow Rutile Quartz, Round, Transparent

13 mm (calibrated)

$ 35.12

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45.38ct Gray Hematite, Marquise, Opaque

45.38ct Gray Hematite, Marquise, Opaque

30.4 x 13.5 mm

$ 44.26

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2.12ct Orange Coral, Oval, Opaque
Coral Product Video (499173)

2.12ct Orange Coral, Oval, Opaque

10.9 x 5.4 mm

$ 348.40

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1.70ct Brown Diamond, Round, SI
Diamond Product Video (382092)

1.70ct Brown Diamond, Round, SI

7.5 mm (calibrated)

$ 3,970.74

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13.22ct Multicolor Ruby In Fuchsite, Marquise, Translucent
Ruby in Fuchsite Product Video (384723)

13.22ct Multicolor Ruby In Fuchsite, Marquise, Translucent

23.9 x 15.1 mm

$ 98.92

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34.50ct Pink Rose Quartz, Marquise, Transparent
Rose Quartz Product Video (355079)

34.50ct Pink Rose Quartz, Marquise, Transparent

34 x 18.4 mm

$ 75.60

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89.56ct Yellow Quartz, Oval, VVS
Quartz Product Video (470296)

89.56ct Yellow Quartz, Oval, VVS

36 x 22.7 mm

$ 122.66

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0.73ct Yellow Color-Change Garnet, Emerald Cut, VS

0.73ct Yellow Color-Change Garnet, Emerald Cut, VS

7.1 x 3.5 mm

$ 79.98

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1.82ct White Sillimanite Cat'S Eye, Oval, Transparent

1.82ct White Sillimanite Cat'S Eye, Oval, Transparent

8 x 6 mm (calibrated)

$ 5.98

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43.05ct Multicolor Jasper, Pear Shape, Opaque

43.05ct Multicolor Jasper, Pear Shape, Opaque

34.7 x 26.7 mm

$ 35.37

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1.10ct Green Tsavorite Garnet, Heart, VS-SI
Tsavorite Garnet Product Video (415384)

1.10ct Green Tsavorite Garnet, Heart, VS-SI

6.7 x 5.8 mm

$ 602.58

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0.97ct Yellow Color-Change Garnet, Cushion, VS-SI

0.97ct Yellow Color-Change Garnet, Cushion, VS-SI

6.8 x 4.2 mm

$ 86.09

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2.70ct Pink Tourmaline, Emerald Cut, VS-SI

2.70ct Pink Tourmaline, Emerald Cut, VS-SI

9.4 x 6.1 mm

$ 170.09

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11.48ct Multicolor Quartz With Marcasite, Baguette, Transparent

11.48ct Multicolor Quartz With Marcasite, Baguette, Transparent

16 x 12 mm (calibrated)

$ 62.89

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9.99ct Yellow Apatite, Cushion, VVS-VS
Apatite Product Video (398362)

9.99ct Yellow Apatite, Cushion, VVS-VS

17.1 x 10.5 mm

$ 473.71

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18.15ct White Rainbow Moonstone, Pear Shape, Transparent
Rainbow Moonstone Product Video (674275)

18.15ct White Rainbow Moonstone, Pear Shape, Transparent

21.9 x 16.3 mm

$ 225.97

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20.64ct Blue Chalcedony, Marquise, Opaque

20.64ct Blue Chalcedony, Marquise, Opaque

32.4 x 15.7 mm

$ 51.39

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41.62ct Multicolor Jasper, Pear Shape, Opaque

41.62ct Multicolor Jasper, Pear Shape, Opaque

38.2 x 33.5 mm

$ 45.60

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18.23ct Multicolor Labradorite, Round, Opaque

18.23ct Multicolor Labradorite, Round, Opaque

21.1 mm

$ 13.62

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29.76ct Multicolor Obsidian, Oval, Opaque

29.76ct Multicolor Obsidian, Oval, Opaque

30 x 22 mm (calibrated)

$ 25.11

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49.22ct Brown Tiger'S Eye Matrix, Fancy, Opaque
Tiger's Eye Matrix Product Video (322581)

49.22ct Brown Tiger'S Eye Matrix, Fancy, Opaque

30.5 x 20.6 mm

$ 49.02

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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 -> 8 star ratings

Good prices

Posted By TRM in October, 2025
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 -> 8 star ratings

Site worked well and helped me find a rock that matched what I was looking for. Well within budget and I trust it will show up, so that's definitely positive. Not much else to it. Satisfied.

Posted By Big Ricky in May, 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 -> 9 star ratings

Ita's a pretty good and simple way to find gems that youa're looking for amazing selection

Posted By Amman in May, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

I visited several online loose stone shops trying to find rare stones. I finally found one that I've been looking for here, and very satisfied. Looking forward to receive the item in 3 weeks.

Posted By Atsu in December, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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