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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

Size Explained

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For Example: 8-9
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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33.01ct Gray Hematite, Oval, Opaque

33.01ct Gray Hematite, Oval, Opaque

20.2 x 17 mm

$ 33.27

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1.87ct Purple Tourmaline, Oval, SI

1.87ct Purple Tourmaline, Oval, SI

8.4 x 6.9 mm

$ 93.50

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0.19ctw Black Diamond, Square, Opaque

0.19ctw Black Diamond, Square, Opaque

2.1 x 2.1 mm

$ 94.62

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2.99ct Multicolor Boulder Opal, Fancy, Opaque

2.99ct Multicolor Boulder Opal, Fancy, Opaque

14.7 x 6.7 mm

$ 12.41

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1.76ct Yellow Citrine, Flower Cut, Transparent

1.76ct Yellow Citrine, Flower Cut, Transparent

7.5 x 7.4 mm

$ 13.50

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8.30ct Pink Morganite, Oval, Translucent

8.30ct Pink Morganite, Oval, Translucent

14.7 x 11.2 mm

$ 82.67

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2.73ctw White Rainbow Moonstone, Square, Transparent

2.73ctw White Rainbow Moonstone, Square, Transparent

3.2 x 3.1 mm

$ 50.85

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1.05ct Multicolor Opal, Oval, Transparent

1.05ct Multicolor Opal, Oval, Transparent

9 x 7 mm (calibrated)

$ 31.37

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2.66ctw White Rainbow Moonstone, Square, Transparent

2.66ctw White Rainbow Moonstone, Square, Transparent

3 x 3 mm (calibrated)

$ 42.01

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5.15ct Orange Moonstone, Round, Opaque

5.15ct Orange Moonstone, Round, Opaque

11 mm (calibrated)

$ 10.26

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2.43ct Pink Tourmaline, Emerald Cut, SI

2.43ct Pink Tourmaline, Emerald Cut, SI

7.7 x 6.9 mm

$ 88.74

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32.76ct Green Amazonite, Pear Shape, Opaque

32.76ct Green Amazonite, Pear Shape, Opaque

30.3 x 20.3 mm

$ 26.10

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32.46ct Multicolor Jasper, Pear Shape, Opaque

32.46ct Multicolor Jasper, Pear Shape, Opaque

28.4 x 19.1 mm

$ 35.57

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24.94ct Purple Ruby-Zoisite, Flower Cut, Opaque

24.94ct Purple Ruby-Zoisite, Flower Cut, Opaque

17.8 x 17.2 mm

$ 30.31

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2.49ct White Rainbow Moonstone, Round, Transparent

2.49ct White Rainbow Moonstone, Round, Transparent

9 mm (calibrated)

$ 42.38

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6.22ctw Brown Smoky Quartz, Marquise, VVS

6.22ctw Brown Smoky Quartz, Marquise, VVS

18.1 x 7.2 mm

$ 37.17

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5.46ct Pink Rose Quartz, Square, Transparent

5.46ct Pink Rose Quartz, Square, Transparent

10 x 10 mm (calibrated)

$ 29.91

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2.70ct Yellow Citrine, Oval, VVS

2.70ct Yellow Citrine, Oval, VVS

12 x 8 mm (calibrated)

$ 16.35

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0.72ct Purple Spinel, Heart, VS

0.72ct Purple Spinel, Heart, VS

6.1 x 5.4 mm

$ 86.40

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31.10ct Green Bloodstone, Oval, Opaque

31.10ct Green Bloodstone, Oval, Opaque

19.2 x 16.4 mm

$ 61.95

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8.49ctw Red Hessonite Garnet, Oval, Translucent

8.49ctw Red Hessonite Garnet, Oval, Translucent

12 x 8 mm (calibrated)

$ 46.51

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2.89ctw Yellow Citrine, Square, VVS-VS

2.89ctw Yellow Citrine, Square, VVS-VS

7 x 7 mm (calibrated)

$ 18.99

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2.50ct Green Prehnite, Pear Shape, Transparent

2.50ct Green Prehnite, Pear Shape, Transparent

10.5 x 8 mm

$ 13.59

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14.70ctw Multicolor Pietersite, Round, Opaque

14.70ctw Multicolor Pietersite, Round, Opaque

14 mm (calibrated)

$ 34.70

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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 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

Overall Rating -> 10 star ratings

GemSelect offers excellent choices, prices & service- highly recommended! Unfortunately, prior to ordering a replacement gemstone, my jeweler neglected to mention it needed to be one that was a'cushion cuta' to fit the existing mount. Have yet to return/exchangea'

Posted By CJ in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.

Posted By Atsuhisa in January, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

It was fine

Posted By Na in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Over pretty well experience the your website no complaints about it very easy reliable service provided

Posted By Blas in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I love the products. I've bought them as gifts and people love my gifts

Posted By Love it! in February, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
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