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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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0.95ct Pink Morganite, Round, VS

0.95ct Pink Morganite, Round, VS

6.5 mm (calibrated)

$ 36.90

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2.63ct White Opal, Pear Shape, Translucent

2.63ct White Opal, Pear Shape, Translucent

14 x 9 mm (calibrated)

$ 66.14

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0.86ctw Orange Citrine, Marquise, VS

0.86ctw Orange Citrine, Marquise, VS

8 x 4 mm (calibrated)

$ 5.14

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1.67ct Yellow Citrine, Round, VVS

1.67ct Yellow Citrine, Round, VVS

8 mm (calibrated)

$ 13.30

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10.82ct Multicolor Agate, Oval, Opaque

10.82ct Multicolor Agate, Oval, Opaque

14.7 x 11.5 mm

$ 18.32

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1.43ct Orange Hessonite Garnet, Emerald Cut, VS-SI

1.43ct Orange Hessonite Garnet, Emerald Cut, VS-SI

7 x 5 mm (calibrated)

$ 24.49

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21.09ct Multicolor Opal, Oval, Transparent

21.09ct Multicolor Opal, Oval, Transparent

25.4 x 16.5 mm

$ 525.14

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4.08ct Yellow Rutile Quartz, Oval, Transparent

4.08ct Yellow Rutile Quartz, Oval, Transparent

12 x 8 mm (calibrated)

$ 11.17

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33.02ct Gray Hematite, Round, Opaque

33.02ct Gray Hematite, Round, Opaque

20 mm (calibrated)

$ 32.20

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6.66ct Green Prehnite, Fancy, Translucent

6.66ct Green Prehnite, Fancy, Translucent

17.2 x 11.3 mm

$ 10.95

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15.43ctw Green Prehnite, Fancy, Translucent

15.43ctw Green Prehnite, Fancy, Translucent

17.8 x 12.3 mm

$ 25.35

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13.57ct Yellow Calcite, Oval, Translucent

13.57ct Yellow Calcite, Oval, Translucent

24.5 x 13.7 mm

$ 9.32

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2.74ct Green Fluorite, Pear Shape, Transparent

2.74ct Green Fluorite, Pear Shape, Transparent

10 x 7 mm (calibrated)

$ 10.91

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1.17ct Green Sphene, Oval, Transparent

1.17ct Green Sphene, Oval, Transparent

6.3 x 5.8 mm

$ 5.83

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9.32ctw Yellow Citrine, Oval, VVS-VS

9.32ctw Yellow Citrine, Oval, VVS-VS

14 x 10 mm (calibrated)

$ 55.96

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12.15ct White Rainbow Moonstone, Oval, Transparent

12.15ct White Rainbow Moonstone, Oval, Transparent

18 x 13 mm (calibrated)

$ 181.52

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5.68ct Yellow Citrine, Oval, VVS-VS

5.68ct Yellow Citrine, Oval, VVS-VS

14 x 10 mm (calibrated)

$ 34.10

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52.40ct Multicolor Matrix Opal, Oval, Opaque
Matrix Opal Product Video (728379)

52.40ct Multicolor Matrix Opal, Oval, Opaque

42.8 x 27.5 mm

$ 88.73

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2.64ct Orange Hessonite Garnet, Oval, VS-SI

2.64ct Orange Hessonite Garnet, Oval, VS-SI

9.3 x 7.7 mm

$ 39.36

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1.86ct Yellow Citrine, Oval, VVS-VS

1.86ct Yellow Citrine, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 12.23

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2.91ctw Orange Hessonite Garnet, Emerald Cut, VS

2.91ctw Orange Hessonite Garnet, Emerald Cut, VS

6 x 6 mm (calibrated)

$ 57.39

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0.87ct Yellow Morganite, Cushion, VS

0.87ct Yellow Morganite, Cushion, VS

6 x 6 mm (calibrated)

$ 52.43

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12.99ct Yellow Rutile Quartz, Pear Shape, Transparent

12.99ct Yellow Rutile Quartz, Pear Shape, Transparent

19.2 x 14.3 mm

$ 35.30

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40.55ct Multicolor Boulder Opal, Fancy, Opaque
Boulder Opal Product Video (718641)

40.55ct Multicolor Boulder Opal, Fancy, Opaque

26 x 23.1 mm

$ 201.94

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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

Love how easy the site is to use. Really love that the pictures are of actual product.

Posted By LeAnn in January, 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

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

Overall Rating -> 10 star ratings

easy site to navigate

Posted By Curt's Cabochons in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

The website was very easy to use.

Posted By Garnet in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
Source: Bizrate
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