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
13.59ct Brown Smoky Quartz, Emerald Cut, VVS
Smoky Quartz Product Video (599537)

13.59ct Brown Smoky Quartz, Emerald Cut, VVS

16 x 16 mm (calibrated)

$ 37.23

View Gem
0.17ct Yellow Diamond, Round, VS
Diamond Product Video (543902)

0.17ct Yellow Diamond, Round, VS

3.5 mm (calibrated)

$ 306.68

View Gem
236.30ct Pink Star Rose Quartz, Oval, Transparent/Translucent
Star Rose Quartz Product Video (344438)

236.30ct Pink Star Rose Quartz, Oval, Transparent/Translucent

38.2 x 36.2 mm

$ 539.36

View Gem
1.18ct Yellow Color-Change Diaspore, Emerald Cut, VS

1.18ct Yellow Color-Change Diaspore, Emerald Cut, VS

6.2 x 5.3 mm

$ 55.13

View Gem
3.26ct Pink Tourmaline, Emerald Cut, SI
Tourmaline Product Video (544803)

3.26ct Pink Tourmaline, Emerald Cut, SI

9.8 x 6.7 mm

$ 205.37

View Gem
43.39ct Pink Rose Quartz, Pear Shape, Transparent
Rose Quartz Product Video (528821)

43.39ct Pink Rose Quartz, Pear Shape, Transparent

30 x 20.2 mm

$ 79.23

View Gem
0.31ct Brown Diamond, Round, VS
Diamond Product Video (564603)

0.31ct Brown Diamond, Round, VS

4.5 mm (calibrated)

$ 514.48

View Gem
21.39ct Multicolor Boulder Opal, Cushion, Opaque
Boulder Opal Product Video (626298)

21.39ct Multicolor Boulder Opal, Cushion, Opaque

16 x 16 mm (calibrated)

$ 164.04

View Gem
19.53ct Multicolor Rainbow Pyrite, Oval, Opaque

19.53ct Multicolor Rainbow Pyrite, Oval, Opaque

23.8 x 17.9 mm

$ 50.58

View Gem
56.50ct Violet Charoite, Oval, Opaque
Charoite Product Video (567268)

56.50ct Violet Charoite, Oval, Opaque

45.2 x 27 mm

$ 105.86

View Gem
5.55ct Orange Imperial Topaz, Pear Shape, VVS
Imperial Topaz Product Video (346661)

5.55ct Orange Imperial Topaz, Pear Shape, VVS

16.5 x 7.1 mm

$ 3,095.57

View Gem
13.54ctw Black Spinel, Round, Opaque

13.54ctw Black Spinel, Round, Opaque

12 mm (calibrated)

$ 44.50

View Gem
1.22ct Green Chrysoberyl, Pear Shape, VVS

1.22ct Green Chrysoberyl, Pear Shape, VVS

8 x 6 mm (calibrated)

$ 142.18

View Gem
9.27ct Pink Morganite, Trillion, Translucent

9.27ct Pink Morganite, Trillion, Translucent

14 x 14 mm (calibrated)

$ 101.56

View Gem
33.90ct Turquoise Chrysocolla, Oval, Opaque

33.90ct Turquoise Chrysocolla, Oval, Opaque

33.1 x 19.2 mm

$ 57.73

View Gem
0.16ctw White Diamond, Round, VVS-VS

0.16ctw White Diamond, Round, VVS-VS

2.8 mm (calibrated)

$ 242.24

View Gem
11.09ct Purple Kunzite, Trillion, VS
Kunzite Product Video (409216)

11.09ct Purple Kunzite, Trillion, VS

16.7 x 13 mm

$ 313.23

View Gem
19.70ct Blue Chalcedony, Cushion, Opaque

19.70ct Blue Chalcedony, Cushion, Opaque

23.3 x 17.3 mm

$ 49.05

View Gem
22.74ct White Howlite, Sphere / Ball, Opaque

22.74ct White Howlite, Sphere / Ball, Opaque

15 mm (calibrated)

$ 11.77

View Gem
0.84ct Multicolor Chocolate Opal, Round, Translucent

0.84ct Multicolor Chocolate Opal, Round, Translucent

8 mm (calibrated)

$ 27.61

View Gem
6.82ct Multicolor Fire Agate, Fancy, Translucent

6.82ct Multicolor Fire Agate, Fancy, Translucent

12.7 x 11.4 mm

$ 53.49

View Gem
0.73ct Yellow Color-Change Garnet, Emerald Cut, VVS

0.73ct Yellow Color-Change Garnet, Emerald Cut, VVS

7.1 x 3.5 mm

$ 79.18

View Gem
13.66ct Purple Kunzite, Pear Shape, VVS-VS
Kunzite Product Video (693497)

13.66ct Purple Kunzite, Pear Shape, VVS-VS

16.9 x 10.2 mm

$ 375.92

View Gem
13.13ct Black Tourmaline, Round, Opaque

13.13ct Black Tourmaline, Round, Opaque

14 mm (calibrated)

$ 54.49

View Gem
1 2 3
...
30
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

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 -> 9 star ratings

Will know more once order received

Posted By Jim in September, 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 -> 10 star ratings

No problems. I had a minor address issue in the past and someone got back to me very quickly and we resolved the issue satisfactorily. I appreciated the quick, concerned response. So important when buyer/seller are so far apart in distance. Thank you Gem Select. Keep up the good work!

Posted By Orphanboy in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

It's mostly good, only some item's are easier to find through the search than the menu

Posted By Wayne in July, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very good.

Posted By Tommy in December, 2025
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
Enlarged Gemstone Image