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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
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0.57ct Brown Color-Change Garnet, Oval, VVS-VS

0.57ct Brown Color-Change Garnet, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 51.09

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3.40ct Brown Rutile Quartz, Round, Transparent

3.40ct Brown Rutile Quartz, Round, Transparent

11 mm (calibrated)

$ 8.53

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9.66ct Multicolor Boulder Opal, Fancy, Opaque

9.66ct Multicolor Boulder Opal, Fancy, Opaque

26.4 x 12.5 mm

$ 48.11

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0.59ct Red Pyrope Garnet, Heart, VVS-VS

0.59ct Red Pyrope Garnet, Heart, VVS-VS

5 x 5 mm (calibrated)

$ 14.69

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1.15ct Pink Strawberry Quartz, Oval, Transparent

1.15ct Pink Strawberry Quartz, Oval, Transparent

7 x 5 mm (calibrated)

$ 5.74

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19.32ct Multicolor Agate, Round, Opaque

19.32ct Multicolor Agate, Round, Opaque

15 mm (calibrated)

$ 32.71

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23.19ct White Rainbow Moonstone, Fancy, Transparent

23.19ct White Rainbow Moonstone, Fancy, Transparent

25.8 x 15.4 mm

$ 184.77

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8.08ct Multicolor Amethyst Geode Slice, Fancy, Transparent

8.08ct Multicolor Amethyst Geode Slice, Fancy, Transparent

18 x 13 mm (calibrated)

$ 8.62

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1.97ct Violet Amethyst, Marquise, VS

1.97ct Violet Amethyst, Marquise, VS

11.9 x 6 mm

$ 15.11

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37.79ct Multicolor Jasper, Cushion, Opaque

37.79ct Multicolor Jasper, Cushion, Opaque

30 x 22 mm (calibrated)

$ 26.09

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2.92ctw Violet Amethyst, Trillion, VS

2.92ctw Violet Amethyst, Trillion, VS

6.9 x 6.2 mm

$ 19.19

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0.69ct Yellow Zircon, Oval, VVS-VS

0.69ct Yellow Zircon, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 17.18

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19.63ct Multicolor Pietersite, Oval, Opaque

19.63ct Multicolor Pietersite, Oval, Opaque

30 x 22 mm (calibrated)

$ 64.52

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2.69ct Orange Hessonite Garnet, Oval, VS-SI

2.69ct Orange Hessonite Garnet, Oval, VS-SI

9.1 x 7.6 mm

$ 40.11

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2.82ct Red Almandine Garnet, Oval, VVS

2.82ct Red Almandine Garnet, Oval, VVS

10 x 8 mm (calibrated)

$ 105.33

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2.96ctw Yellow Citrine, Round, VVS

2.96ctw Yellow Citrine, Round, VVS

8 mm (calibrated)

$ 23.59

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1.08ct Blue Kyanite, Oval, VS-SI

1.08ct Blue Kyanite, Oval, VS-SI

7 x 5 mm (calibrated)

$ 23.66

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1.12ctw Multicolor Opal, Oval, Translucent
Opal Product Video (548532)

1.12ctw Multicolor Opal, Oval, Translucent

6.9 x 4.8 mm

$ 278.88

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7.37ct Multicolor Fire Agate, Fancy, Opaque

7.37ct Multicolor Fire Agate, Fancy, Opaque

17.8 x 8.4 mm

$ 56.67

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21.73ct Gray Hematite, Baguette, Opaque

21.73ct Gray Hematite, Baguette, Opaque

18.3 x 14.1 mm

$ 14.28

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0.91ct Orange Sunstone, Oval, Translucent

0.91ct Orange Sunstone, Oval, Translucent

8 x 6 mm (calibrated)

$ 6.34

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1.35ct Gray Sillimanite Cat'S Eye, Oval, Transparent

1.35ct Gray Sillimanite Cat'S Eye, Oval, Transparent

8 x 5 mm (calibrated)

$ 4.44

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4.40ctw Yellow Citrine, Oval, VVS

4.40ctw Yellow Citrine, Oval, VVS

10 x 8 mm (calibrated)

$ 24.10

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1.98ct Green Peridot, Cushion, VS

1.98ct Green Peridot, Cushion, VS

8 x 6.4 mm

$ 70.60

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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

I have a beautiful emerald I purchased from a company names gemselect and they are awesome! You should try them out?

Posted By Lynn in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Filters need to be improved but rest of website is great

Posted By Rock hound in December, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

It was fine . Wish there had been more round stones to select from

Posted By Emm in January, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

The purchasing process is fairly quick and straightforward and for me user friendly so it probably took more or less than 3 minutes to purchase and pay for the items. I wish there was a discount offer for multiple items to encourage us buyers to purchase more an incentive and add more sales in your end. Besides that, it's been a great purchasing experience and will continue to shop as I am a repeat customer and have bought from your store many times before. Thank you.

Posted By Emmanuel in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.

Posted By Maggie in August, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Easy process.

Posted By Crafty Seabee in March, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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