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
4.60ctw Yellow Citrine, Oval, VS

4.60ctw Yellow Citrine, Oval, VS

10 x 8 mm (calibrated)

$ 25.20

View Gem
2.50ctw Violet Amethyst, Oval, VVS-VS

2.50ctw Violet Amethyst, Oval, VVS-VS

6 x 4 mm (calibrated)

$ 13.70

View Gem
0.90ct Green Peridot, Oval, VS

0.90ct Green Peridot, Oval, VS

7 x 5 mm (calibrated)

$ 6.27

View Gem
15.81ct Violet Amethyst, Round, VVS

15.81ct Violet Amethyst, Round, VVS

16 mm (calibrated)

$ 110.22

View Gem
28.37ct Multicolor Jasper, Oval, Opaque

28.37ct Multicolor Jasper, Oval, Opaque

27.3 x 23 mm

$ 15.55

View Gem
5.35ct Red Almandine Garnet, Oval, VVS-VS

5.35ct Red Almandine Garnet, Oval, VVS-VS

12.8 x 9.7 mm

$ 186.50

View Gem
11.22ctw Green Amazonite, Cushion, Opaque

11.22ctw Green Amazonite, Cushion, Opaque

10 x 10 mm (calibrated)

$ 27.29

View Gem
0.69ct White Rainbow Moonstone, Oval, Transparent

0.69ct White Rainbow Moonstone, Oval, Transparent

7 x 5 mm (calibrated)

$ 11.69

View Gem
4.99ct Brown Smoky Quartz, Fancy, VVS

4.99ct Brown Smoky Quartz, Fancy, VVS

21.5 x 9 mm

$ 24.85

View Gem
12.71ct Gray Jadeite, Oval, Opaque

12.71ct Gray Jadeite, Oval, Opaque

18.3 x 11.5 mm

$ 41.77

View Gem
1.32ct Orange Hessonite Garnet, Baguette, SI

1.32ct Orange Hessonite Garnet, Baguette, SI

7 x 5 mm (calibrated)

$ 28.93

View Gem
1.45ct Turquoise Grandidierite, Pear Shape, VS-SI
Grandidierite Product Video (471923)

1.45ct Turquoise Grandidierite, Pear Shape, VS-SI

9.4 x 6.6 mm

$ 722.10

View Gem
0.55ct Purple Spinel, Round, VVS-VS

0.55ct Purple Spinel, Round, VVS-VS

5 mm (calibrated)

$ 28.84

View Gem
3.65ct Pink Morganite, Pear Shape, Transparent

3.65ct Pink Morganite, Pear Shape, Transparent

13.7 x 8.1 mm

$ 39.99

View Gem
16.76ctw Green Aventurine, Baguette, Translucent

16.76ctw Green Aventurine, Baguette, Translucent

17.9 x 9.8 mm

$ 38.74

View Gem
4.10ctw Violet Amethyst, Oval, Transparent

4.10ctw Violet Amethyst, Oval, Transparent

10 x 8 mm (calibrated)

$ 22.46

View Gem
1.62ct Green Sphene, Oval, Transparent

1.62ct Green Sphene, Oval, Transparent

8 x 6 mm (calibrated)

$ 8.87

View Gem
1.79ctw Orange Hessonite Garnet, Round, VS

1.79ctw Orange Hessonite Garnet, Round, VS

5.8 mm

$ 27.58

View Gem
30.49ct White Howlite, Oval, Opaque

30.49ct White Howlite, Oval, Opaque

31.6 x 22.6 mm

$ 15.19

View Gem
2.83ctw Red Pyrope Garnet, Marquise, VVS-VS

2.83ctw Red Pyrope Garnet, Marquise, VVS-VS

10.1 x 5.2 mm

$ 24.80

View Gem
34.77ct Brown Jasper, Fancy, Opaque

34.77ct Brown Jasper, Fancy, Opaque

37.5 x 11.2 mm

$ 6.92

View Gem
4.42ct Multicolor Pietersite, Marquise, Opaque

4.42ct Multicolor Pietersite, Marquise, Opaque

25 x 7.5 mm

$ 13.21

View Gem
0.81ct Purple Spinel, Cushion, VS-SI
Spinel Product Video (691814)

0.81ct Purple Spinel, Cushion, VS-SI

5.7 x 4 mm

$ 56.47

View Gem
1.51ct Yellow Citrine, Square, VS

1.51ct Yellow Citrine, Square, VS

7 x 7 mm (calibrated)

$ 9.93

View Gem
1 2 3
...
243
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 -> 10 star ratings

Great website, easy to navigate, and loads quickly. Have bought here before, very pleased!

Posted By SallyO in February, 2026
Source: Bizrate

Overall Rating -> 8 star ratings

I visited several online loose stone shops trying to find rare stones. I finally found one that I've been looking for here, and very satisfied. Looking forward to receive the item in 3 weeks.

Posted By Atsu in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Good, hope gem quality is good and genuine

Posted By Varun in May, 2026
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

Overall Rating -> 9 star ratings

Ita's a pretty good and simple way to find gems that youa're looking for amazing selection

Posted By Amman in May, 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
Enlarged Gemstone Image