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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
Untreated Gemstones Clarity
Untreated Gemstones Price
Untreated Gemstones Treatment

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Bi-color Untreated Gemstones
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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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4.86ct Yellow Citrine, Oval, VVS-VS

4.86ct Yellow Citrine, Oval, VVS-VS

12 x 10 mm (calibrated)

$ 37.27

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2.70ctw Green Peridot, Round, VVS-VS

2.70ctw Green Peridot, Round, VVS-VS

5 mm (calibrated)

$ 44.37

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2.33ct Red Almandine Garnet, Oval, VVS-VS

2.33ct Red Almandine Garnet, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 87.03

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2.79ctw Red Spessartite Garnet, Round, VVS-VS

2.79ctw Red Spessartite Garnet, Round, VVS-VS

5 mm (calibrated)

$ 94.76

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26.71ct Multicolor Opal, Round, Opaque
Opal Product Video (744020)

26.71ct Multicolor Opal, Round, Opaque

22.5 mm

$ 1,330.16

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10.22ct Multicolor Agate, Oval, Opaque

10.22ct Multicolor Agate, Oval, Opaque

14.1 x 13.3 mm

$ 17.30

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8.11ct Pink Cat'S Eye Tourmaline, Oval, Translucent
Cat's Eye Tourmaline Product Video (752669)

8.11ct Pink Cat'S Eye Tourmaline, Oval, Translucent

11 x 11 mm (calibrated)

$ 1,211.63

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5.16ct Red Strawberry Quartz, Oval, Translucent

5.16ct Red Strawberry Quartz, Oval, Translucent

14 x 10 mm (calibrated)

$ 30.69

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3.19ct Orange Sunstone, Oval, Transparent

3.19ct Orange Sunstone, Oval, Transparent

11 x 9 mm (calibrated)

$ 48.94

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9.13ct Pink Strawberry Quartz, Oval, Translucent

9.13ct Pink Strawberry Quartz, Oval, Translucent

16 x 12 mm (calibrated)

$ 70.02

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31.46ct Multicolor Quartz With Marcasite, Oval, Transparent
Quartz With Marcasite Product Video (521450)

31.46ct Multicolor Quartz With Marcasite, Oval, Transparent

30.3 x 16.1 mm

$ 206.81

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1.24ct Purple Spinel, Cushion, VVS

1.24ct Purple Spinel, Cushion, VVS

6.7 x 5.8 mm

$ 123.50

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0.65ct Green Tourmaline, Emerald Cut, VS

0.65ct Green Tourmaline, Emerald Cut, VS

4.7 x 4.5 mm

$ 32.37

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2.91ctw Blue Kyanite, Oval, SI

2.91ctw Blue Kyanite, Oval, SI

8 x 6 mm (calibrated)

$ 60.57

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1.95ct Orange Hessonite Garnet, Cushion, VS-SI

1.95ct Orange Hessonite Garnet, Cushion, VS-SI

7 x 7 mm (calibrated)

$ 32.79

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4.45ctw Multicolor Labradorite, Round, Translucent

4.45ctw Multicolor Labradorite, Round, Translucent

8 mm (calibrated)

$ 5.44

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1.00ctw Yellow Citrine, Heart, VVS-VS

1.00ctw Yellow Citrine, Heart, VVS-VS

5.4 x 5.2 mm

$ 6.97

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2.00ct Orange Hessonite Garnet, Oval, VS-SI

2.00ct Orange Hessonite Garnet, Oval, VS-SI

8.5 x 7 mm

$ 28.49

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1.15ct Purple Spinel, Cushion, VVS

1.15ct Purple Spinel, Cushion, VVS

6.6 x 6.5 mm

$ 60.47

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0.81ct Brown Sillimanite Cat'S Eye, Oval, Transparent

0.81ct Brown Sillimanite Cat'S Eye, Oval, Transparent

6.4 x 4.7 mm

$ 2.42

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1.36ct Blue Kyanite, Oval, SI

1.36ct Blue Kyanite, Oval, SI

7 x 5 mm (calibrated)

$ 33.86

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5.85ct Brown Tiger'S Eye, Oval, Opaque

5.85ct Brown Tiger'S Eye, Oval, Opaque

14 x 10 mm (calibrated)

$ 5.83

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8.52ct Green Jadeite, Oval, Translucent

8.52ct Green Jadeite, Oval, Translucent

16.8 x 12.6 mm

$ 28.00

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2.30ct Pink Tourmaline, Oval, VS
Tourmaline Product Video (742823)

2.30ct Pink Tourmaline, Oval, VS

9.4 x 7.6 mm

$ 286.35

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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

My experience has always been fantastic. Today I saved 6 gems to email a customer looking for a particular color blend to fit into an east west setting, so her options were limited, but we found one she wanted, deleted all the others in the cart and order the gem she selected. It was helpful to be able to put them in the cart so I could save them until she selected the one she wanted without having to research all of them again.

Posted By RJ 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

Overall Rating -> 10 star ratings

I am filling a small treasure chest and picked a nice amethyst.

Posted By VinnyD in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

This is the first time I have used this site. I was dissatisfied with the quality of gems and supplies elsewhere and decided to try GemSelect. They are awesome! I was thrilled to see the variety and the great web performance. There was the ability to search for information as well as gems. Things like the clarity rating system and caret weight of the gems. I have always loved making things and I have just started to make jewelry as a business. However I have never made a ring before and have always wanted to. On GemSelect I was able to find good quality gems to use in my creations. I am so glad the website is so easy to use. Thank you GemSelect.

Posted By PickyShopper in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

selection was broad and the check out was quick. Great site

Posted By JC Karl in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.

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