90,000+Happy Customers
20+Years
WorldwideShipping
Cart
Free Report Included
Worldwide Shipping
30 Day Returns
Help Center Shipping Payment and Checkout Returns Certificates Contact Us
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

Choose Size or Size Range
For Example: 6-7
For Example: 8-9
Bi-color Untreated Gemstones
Black Untreated Gemstones
Blue Untreated Gemstones
Brown Untreated Gemstones
Golden Untreated Gemstones
Gray Untreated Gemstones
Green Untreated Gemstones
Multicolor Untreated Gemstones
Orange Untreated Gemstones
Pink Untreated Gemstones
Purple Untreated Gemstones
Red Untreated Gemstones
Turquoise Untreated Gemstones
Violet Untreated Gemstones
White Untreated Gemstones
Yellow Untreated Gemstones
Single
Pairs
Lots
Faceted
Cabochons
Clear All
0.52ct Green Chrome Diopside, Oval, VVS-VS

0.52ct Green Chrome Diopside, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 12.95

View Gem
3.51ct Orange Sunstone, Oval, Transparent

3.51ct Orange Sunstone, Oval, Transparent

11 x 9 mm (calibrated)

$ 21.12

View Gem
1.07ct Orange Sunstone, Oval, Translucent

1.07ct Orange Sunstone, Oval, Translucent

8 x 6 mm (calibrated)

$ 7.46

View Gem
3.26ctw Yellow Citrine, Oval, VVS-VS

3.26ctw Yellow Citrine, Oval, VVS-VS

9 x 7 mm (calibrated)

$ 17.86

View Gem
15.57ct White Rainbow Moonstone, Oval, Transparent

15.57ct White Rainbow Moonstone, Oval, Transparent

19.4 x 17.8 mm

$ 232.62

View Gem
14.95ct Multicolor Agate, Oval, Opaque

14.95ct Multicolor Agate, Oval, Opaque

15.7 x 14.4 mm

$ 14.14

View Gem
2.33ctw Violet Amethyst, Oval, VVS-VS

2.33ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 12.77

View Gem
2.33ct Pink Rose Quartz, Flower Cut, Transparent

2.33ct Pink Rose Quartz, Flower Cut, Transparent

13 x 8.2 mm

$ 10.21

View Gem
15.43ctw White Dendritic Agate, Pear Shape, Opaque

15.43ctw White Dendritic Agate, Pear Shape, Opaque

18 x 13 mm (calibrated)

$ 12.29

View Gem
0.21ctw White Diamond, Round, VVS-VS
Diamond Product Video (567453)

0.21ctw White Diamond, Round, VVS-VS

3 mm (calibrated)

$ 375.43

View Gem
12.99ct Multicolor Agate, Round, Opaque

12.99ct Multicolor Agate, Round, Opaque

14 mm (calibrated)

$ 18.33

View Gem
4.34ctw Orange Hessonite Garnet, Emerald Cut, VS

4.34ctw Orange Hessonite Garnet, Emerald Cut, VS

5 x 5 mm (calibrated)

$ 85.59

View Gem
0.56ct Green Tourmaline, Emerald Cut, VVS-VS

0.56ct Green Tourmaline, Emerald Cut, VVS-VS

6 x 4 mm (calibrated)

$ 27.89

View Gem
4.64ctw Violet Amethyst, Oval, VVS-VS

4.64ctw Violet Amethyst, Oval, VVS-VS

6.1 x 4.2 mm

$ 25.41

View Gem
1.50ct Red Pyrope Garnet, Fancy, VS

1.50ct Red Pyrope Garnet, Fancy, VS

9.1 x 3.5 mm

$ 17.96

View Gem
1.19ct Green Sphene, Oval, Transparent

1.19ct Green Sphene, Oval, Transparent

6.7 x 5.6 mm

$ 5.93

View Gem
55.50ct Red Star Garnet, Oval, Opaque

55.50ct Red Star Garnet, Oval, Opaque

22.4 x 19.5 mm

$ 54.73

View Gem
0.52ct Multicolor Opal, Oval, Transparent

0.52ct Multicolor Opal, Oval, Transparent

6.7 x 4.8 mm

$ 12.95

View Gem
4.92ctw Orange Sunstone, Round, Translucent

4.92ctw Orange Sunstone, Round, Translucent

9 mm (calibrated)

$ 29.12

View Gem
7.06ct Yellow Citrine, Emerald Cut, VVS

7.06ct Yellow Citrine, Emerald Cut, VVS

14 x 10 mm (calibrated)

$ 54.14

View Gem
1.00ct Yellow Color-Change Diaspore, Pear Shape, VS

1.00ct Yellow Color-Change Diaspore, Pear Shape, VS

10.9 x 4.2 mm

$ 35.06

View Gem
0.68ct Green Sphene, Oval, Transparent

0.68ct Green Sphene, Oval, Transparent

5.7 x 4.9 mm

$ 3.39

View Gem
0.48ct Blue Kyanite, Round, VS-SI

0.48ct Blue Kyanite, Round, VS-SI

4.3 mm

$ 11.95

View Gem
8.64ctw Multicolor Pietersite, Pear Shape, Opaque

8.64ctw Multicolor Pietersite, Pear Shape, Opaque

19.1 x 12.3 mm

$ 20.22

View Gem
1 2 3
...
478
Choose Page
1 - 1896

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 -> 8 star ratings

I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.

Posted By Meyeusername in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Would have bought an indigo and selenite, but neither listed. But, you do offer quite a large assortment otherwise.

Posted By JD in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Loved the price and the quality and the certification options which is the main reason why I buy. The guarantee is also a great reason to use gem select.

Posted By Sal in July, 2025
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

Very good.

Posted By Tommy in December, 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
→ View All GemSelect Reviews on Bizrate
Enlarged Gemstone Image