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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
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Untreated Gemstones Treatment

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Bi-color Untreated Gemstones
Black Untreated Gemstones
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Multicolor Untreated Gemstones
Orange Untreated Gemstones
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Yellow Untreated Gemstones
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2.70ct White Rainbow Moonstone, Oval, Transparent

2.70ct White Rainbow Moonstone, Oval, Transparent

11 x 9 mm (calibrated)

$ 88.78

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30.91ct Brown Tiger'S Eye, Fancy, Opaque

30.91ct Brown Tiger'S Eye, Fancy, Opaque

37.3 x 10.1 mm

$ 3.08

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0.05ct Black Diamond, Round, Opaque

0.05ct Black Diamond, Round, Opaque

2.2 mm (calibrated)

$ 16.28

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1.96ct Red Almandine Garnet, Marquise, VVS

1.96ct Red Almandine Garnet, Marquise, VVS

12 x 6 mm (calibrated)

$ 73.21

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1.90ct Orange Hessonite Garnet, Round, VS-SI
Hessonite Garnet Product Video (563607)

1.90ct Orange Hessonite Garnet, Round, VS-SI

7 mm (calibrated)

$ 35.39

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1.27ctw Blue Kyanite, Oval, SI

1.27ctw Blue Kyanite, Oval, SI

6 x 4 mm (calibrated)

$ 27.83

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8.06ct Multicolor Agate, Oval, Opaque

8.06ct Multicolor Agate, Oval, Opaque

14.3 x 11.1 mm

$ 13.65

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3.40ct Yellow Sphene, Oval, Transparent

3.40ct Yellow Sphene, Oval, Transparent

11.8 x 6.8 mm

$ 225.76

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4.54ct Multicolor Quartz With Marcasite, Marquise, Transparent

4.54ct Multicolor Quartz With Marcasite, Marquise, Transparent

18 x 8.4 mm

$ 29.84

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48.44ct Multicolor Tiger'S Eye Matrix, Cushion, Opaque

48.44ct Multicolor Tiger'S Eye Matrix, Cushion, Opaque

30.1 x 19.6 mm

$ 48.25

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1.46ct Yellow Citrine, Trillion, VVS-VS

1.46ct Yellow Citrine, Trillion, VVS-VS

8 x 8 mm (calibrated)

$ 9.05

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0.76ct Yellow Color-Change Diaspore, Cushion, VS

0.76ct Yellow Color-Change Diaspore, Cushion, VS

6 x 4.9 mm

$ 29.14

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4.08ct Pink Rose Quartz, Emerald Cut, Transparent

4.08ct Pink Rose Quartz, Emerald Cut, Transparent

9.6 x 9.6 mm

$ 22.35

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0.85ctw Orange Spessartite Garnet, Oval, VS

0.85ctw Orange Spessartite Garnet, Oval, VS

5 x 4 mm (calibrated)

$ 29.63

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5.19ct Violet Amethyst, Oval, Transparent

5.19ct Violet Amethyst, Oval, Transparent

12 x 10 mm (calibrated)

$ 23.70

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58.40ct Brown Tiger'S Eye Matrix, Baguette, Opaque

58.40ct Brown Tiger'S Eye Matrix, Baguette, Opaque

27.3 x 22.6 mm

$ 33.16

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0.32ct Violet Amethyst, Emerald Cut, VS

0.32ct Violet Amethyst, Emerald Cut, VS

5.2 x 3.3 mm

$ 1.86

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1.01ct Orange Sunstone, Oval, Translucent

1.01ct Orange Sunstone, Oval, Translucent

8 x 6 mm (calibrated)

$ 7.04

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4.42ct Pink Strawberry Quartz, Oval, Translucent

4.42ct Pink Strawberry Quartz, Oval, Translucent

12 x 10 mm (calibrated)

$ 52.83

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6.66ct Yellow Apatite, Oval, VS
Apatite Product Video (387571)

6.66ct Yellow Apatite, Oval, VS

13.9 x 11 mm

$ 356.30

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8.83ctw Violet Amethyst, Oval, Transparent

8.83ctw Violet Amethyst, Oval, Transparent

11 x 9 mm (calibrated)

$ 34.93

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4.92ctw Green Peridot, Round, VVS-VS

4.92ctw Green Peridot, Round, VVS-VS

6 mm (calibrated)

$ 40.07

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1.00ct Yellow Morganite, Cushion, VS

1.00ct Yellow Morganite, Cushion, VS

6 x 6 mm (calibrated)

$ 39.35

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3.61ct Multicolor Pietersite, Round, Opaque

3.61ct Multicolor Pietersite, Round, Opaque

10 mm (calibrated)

$ 8.73

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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

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 -> 10 star ratings

Easy and functional

Posted By Dessa in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

My experience was done with ease

Posted By Barb in October, 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 -> 8 star ratings

First time using this website. It was both exciting finding things in my price range and things Iam gonna save up for and use in other pieces. I love that the picture of the gem is the exact gem I'll be buying. I haven't tested the gems yes but they said they sold me 100% natural gems.

Posted By Salvo in July, 2025
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
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