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
21.80ct Green Bloodstone, Oval, Opaque

21.80ct Green Bloodstone, Oval, Opaque

24.6 x 12.3 mm

$ 45.56

View Gem
0.15ct Black Diamond, Square, Opaque

0.15ct Black Diamond, Square, Opaque

2.6 x 2.7 mm

$ 74.70

View Gem
6.20ct Blue Larimar, Round, Translucent

6.20ct Blue Larimar, Round, Translucent

12 mm (calibrated)

$ 74.14

View Gem
1.06ct Orange Moonstone, Pear Shape, Translucent

1.06ct Orange Moonstone, Pear Shape, Translucent

9 x 6 mm (calibrated)

$ 2.12

View Gem
1.19ct Pink Tourmaline, Oval, Transparent

1.19ct Pink Tourmaline, Oval, Transparent

7.8 x 5.6 mm

$ 16.43

View Gem
1.43ct Orange Moonstone, Cushion, Translucent

1.43ct Orange Moonstone, Cushion, Translucent

6 x 6 mm (calibrated)

$ 2.85

View Gem
1.68ctw Yellow Beryl, Oval, VVS-VS

1.68ctw Yellow Beryl, Oval, VVS-VS

8 x 6 mm (calibrated)

$ 33.47

View Gem
0.66ct Yellow Zircon, Oval, VVS

0.66ct Yellow Zircon, Oval, VVS

6 x 4 mm (calibrated)

$ 16.43

View Gem
1.13ct Green Chrysoberyl, Pear Shape, VVS

1.13ct Green Chrysoberyl, Pear Shape, VVS

7.1 x 5.9 mm

$ 108.97

View Gem
1.48ct Yellow Tourmaline, Round, Transparent

1.48ct Yellow Tourmaline, Round, Transparent

6 mm (calibrated)

$ 22.58

View Gem
9.12ct Multicolor Fire Agate, Fancy, Opaque

9.12ct Multicolor Fire Agate, Fancy, Opaque

14.7 x 12.3 mm

$ 49.96

View Gem
20.82ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

20.82ct Multicolor Tiger'S Eye Matrix, Oval, Opaque

21.6 x 14.8 mm

$ 9.55

View Gem
2.08ct Orange Hessonite Garnet, Cushion, VS

2.08ct Orange Hessonite Garnet, Cushion, VS

7 x 7 mm (calibrated)

$ 35.42

View Gem
4.61ctw Red Pyrope Garnet, Marquise, VVS-VS

4.61ctw Red Pyrope Garnet, Marquise, VVS-VS

12 x 6.1 mm

$ 40.40

View Gem
0.83ct Green Peridot, Oval, VS

0.83ct Green Peridot, Oval, VS

7 x 5 mm (calibrated)

$ 5.79

View Gem
10.78ct Yellow Rutile Quartz, Cushion, Transparent

10.78ct Yellow Rutile Quartz, Cushion, Transparent

23.9 x 11.2 mm

$ 29.53

View Gem
19.05ct Bi-Color Ametrine, Pear Shape, VS

19.05ct Bi-Color Ametrine, Pear Shape, VS

20 x 15 mm (calibrated)

$ 125.23

View Gem
3.27ct Red Almandine Garnet, Pear Shape, VS

3.27ct Red Almandine Garnet, Pear Shape, VS

12 x 8 mm (calibrated)

$ 27.14

View Gem
2.90ct Violet Amethyst, Trillion, VS

2.90ct Violet Amethyst, Trillion, VS

10 x 10 mm (calibrated)

$ 23.11

View Gem
0.38ct Pink Morganite, Round, VS

0.38ct Pink Morganite, Round, VS

5 mm (calibrated)

$ 15.77

View Gem
17.81ct Purple Ruby-Zoisite, Flower Cut, Opaque
Ruby-Zoisite Product Video (658710)

17.81ct Purple Ruby-Zoisite, Flower Cut, Opaque

17.1 x 16.6 mm

$ 21.65

View Gem
0.91ct Green Tourmaline, Emerald Cut, VVS-VS

0.91ct Green Tourmaline, Emerald Cut, VVS-VS

5.3 x 4.7 mm

$ 45.32

View Gem
1.36ct Purple Spinel, Oval, VS

1.36ct Purple Spinel, Oval, VS

6.9 x 6 mm

$ 156.46

View Gem
2.25ct Orange Hessonite Garnet, Oval, VS

2.25ct Orange Hessonite Garnet, Oval, VS

8.4 x 7.1 mm

$ 44.82

View Gem
1 2 3
...
1793
Choose Page
1 - 1897

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 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 -> 9 star ratings

They have literally everything on this website! The prices are also pretty good, I was able to find plenty of nice stones that I could afford!

Posted By JC in March, 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

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

All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.

Posted By G.W. in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I loved it! Extensive inventory, great prices, I definitely will be buying from here again!

Posted By Lex in April, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
Enlarged Gemstone Image