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 › Natural Untreated Gemstones

Natural Untreated Gemstones

Discover genuine untreated gemstones selected for natural beauty, rarity, and authenticity.

Natural Untreated Gemstones Weight
Natural Untreated Gemstones Size
Natural Untreated Gemstones Clarity
Natural Untreated Gemstones Price
Natural Untreated Gemstones Treatment

Size Explained

Choose Size or Size Range
For Example: 6-7
For Example: 8-9
Bi-color Natural Untreated Gemstones
Black Natural Untreated Gemstones
Blue Natural Untreated Gemstones
Brown Natural Untreated Gemstones
Golden Natural Untreated Gemstones
Gray Natural Untreated Gemstones
Green Natural Untreated Gemstones
Multicolor Natural Untreated Gemstones
Orange Natural Untreated Gemstones
Pink Natural Untreated Gemstones
Purple Natural Untreated Gemstones
Red Natural Untreated Gemstones
Turquoise Natural Untreated Gemstones
Violet Natural Untreated Gemstones
White Natural Untreated Gemstones
Yellow Natural Untreated Gemstones
Single
Pairs
Lots
Faceted
Cabochons
Clear All
7.75ct Multicolor Coral, Oval, Translucent

7.75ct Multicolor Coral, Oval, Translucent

15.1 x 12.7 mm

$ 22.31

View Gem
3.26ctw White Topaz, Cushion, VVS-VS

3.26ctw White Topaz, Cushion, VVS-VS

4.6 x 4.6 mm

$ 17.86

View Gem
46.10ct Multicolor Jasper, Oval, Opaque

46.10ct Multicolor Jasper, Oval, Opaque

39.2 x 21.2 mm

$ 22.96

View Gem
10.11ctw Multicolor Pietersite, Oval, Opaque

10.11ctw Multicolor Pietersite, Oval, Opaque

17.9 x 10.2 mm

$ 23.66

View Gem
5.42ct Violet Amethyst, Pear Shape, Transparent

5.42ct Violet Amethyst, Pear Shape, Transparent

14 x 10 mm (calibrated)

$ 32.39

View Gem
1.73ct Yellow Citrine, Emerald Cut, VS

1.73ct Yellow Citrine, Emerald Cut, VS

8 x 6 mm (calibrated)

$ 13.26

View Gem
31.50ct Gray Obsidian, Oval, Opaque

31.50ct Gray Obsidian, Oval, Opaque

33 x 21.9 mm

$ 24.85

View Gem
33.16ct Multicolor Jasper, Fancy, Opaque

33.16ct Multicolor Jasper, Fancy, Opaque

37.2 x 10.8 mm

$ 9.91

View Gem
40.31ct Yellow Calcite, Oval, Translucent

40.31ct Yellow Calcite, Oval, Translucent

39.4 x 21.9 mm

$ 27.70

View Gem
0.61ct Green Peridot, Marquise, VVS-VS

0.61ct Green Peridot, Marquise, VVS-VS

8 x 4 mm (calibrated)

$ 9.11

View Gem
5.96ct Green Uvarovite Garnet Drusy, Fancy, Opaque

5.96ct Green Uvarovite Garnet Drusy, Fancy, Opaque

13 x 9 mm (calibrated)

$ 19.39

View Gem
0.52ct Green Peridot, Marquise, VS

0.52ct Green Peridot, Marquise, VS

8 x 4 mm (calibrated)

$ 7.77

View Gem
2.39ct Multicolor Pietersite, Pear Shape, Opaque

2.39ct Multicolor Pietersite, Pear Shape, Opaque

11.1 x 6.9 mm

$ 5.64

View Gem
3.08ctw White Topaz, Cushion, VVS-VS

3.08ctw White Topaz, Cushion, VVS-VS

4.6 x 4.6 mm

$ 16.87

View Gem
0.16ct Black Diamond, Square, Opaque

0.16ct Black Diamond, Square, Opaque

2.7 x 2.5 mm

$ 79.68

View Gem
10.23ct Brown Smoky Quartz, Emerald Cut, VVS-VS

10.23ct Brown Smoky Quartz, Emerald Cut, VVS-VS

13 x 13 mm (calibrated)

$ 20.06

View Gem
0.22ct Black Diamond, Round, Opaque

0.22ct Black Diamond, Round, Opaque

3.5 mm (calibrated)

$ 104.66

View Gem
1.67ctw Red Rhodolite Garnet, Square, VS

1.67ctw Red Rhodolite Garnet, Square, VS

5 x 5 mm (calibrated)

$ 14.61

View Gem
38.84ct Violet Amethyst, Oval, VVS
Amethyst Product Video (753786)

38.84ct Violet Amethyst, Oval, VVS

25 x 18 mm (calibrated)

$ 322.37

View Gem
0.93ct Pink Tourmaline, Round, Transparent

0.93ct Pink Tourmaline, Round, Transparent

6 mm (calibrated)

$ 15.42

View Gem
39.98ct Multicolor Jasper, Oval, Opaque

39.98ct Multicolor Jasper, Oval, Opaque

35.2 x 25.7 mm

$ 21.90

View Gem
45.45ctw Gray Hematite, Round, Opaque

45.45ctw Gray Hematite, Round, Opaque

17 mm (calibrated)

$ 44.32

View Gem
0.56ct White Topaz, Oval, VVS

0.56ct White Topaz, Oval, VVS

6 x 4.2 mm

$ 3.90

View Gem
19.50ct Multicolor Jasper, Fancy, Opaque

19.50ct Multicolor Jasper, Fancy, Opaque

35.9 x 14.9 mm

$ 21.36

View Gem
1 2 3
...
270
Choose Page
1 - 1857

Why Buy Natural Untreated Gemstones from GemSelect?

Why Choose Untreated Gemstones?

Untreated gemstones are valued for their natural color and clarity without artificial enhancement. Many buyers prefer these gems for authenticity, rarity, and long-term value.

Natural Loose Untreated Gems Online

Shop loose untreated gemstones online at GemSelect with confidence. Browse sapphires, rubies, spinels, aquamarine, garnet, tourmaline, and more with full disclosure.

Natural Untreated Gemstones for Jewelry and Collecting

Untreated Gemstones for Jewelry

Natural untreated gems are excellent for rings, earrings, pendants, and custom jewelry. Their original beauty makes every piece unique and meaningful.

Popular Untreated Gemstone Types

Popular choices include untreated sapphire, ruby, spinel, garnet, tourmaline, zircon, aquamarine, and many collector stones in a wide range of colors.

Certified Natural Gemstones

Many buyers choose untreated gemstones with gemological reports for added confidence. Certification can confirm identity and indicate whether treatments are present.

Collector Quality Untreated Gems

Collectors appreciate untreated gemstones because naturally fine examples are rarer than treated material. These stones can be especially desirable when color and clarity are strong.

Calibrated Untreated Gemstones

We also offer calibrated untreated gemstones in popular sizes suitable for standard jewelry settings, making custom designs easier and faster.

Worldwide Shipping from GemSelect

GemSelect offers secure online ordering, detailed product images, and worldwide delivery so you can shop untreated gemstones from anywhere.

Learn more about gemstone treatments, identification, and care on our Gemstone Information Pages.

FAQs

What does untreated gemstone mean?

An untreated gemstone has not undergone enhancement processes such as heating, dyeing, filling, coating, or diffusion to improve appearance.

Are untreated gemstones more valuable?

Often yes, especially in sapphire, ruby, and other premium gems where fine untreated stones are rarer than treated examples.

How can I verify a gemstone is untreated?

Independent laboratory certification is the best way to verify whether a gemstone is natural and untreated.

Which gemstones are commonly sold untreated?

Spinel, garnet, zircon, tourmaline, aquamarine, and some sapphires or rubies are often available untreated depending on source and quality.

Are all untreated gemstones natural?

Natural untreated gemstones are mined stones that have not been enhanced after cutting. Always buy from trusted sellers with clear disclosure.

GemSelect Certified Store Reviews

GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!

Overall Rating -> 9 star ratings

It was fine . Wish there had been more round stones to select from

Posted By Emm in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I have shopped at Gemselect for nearly 20 years. I especially like that you see pictures of the exact gem you are purchasing. You are a trusted source.

Posted By DNaber in October, 2025
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 -> 9 star ratings

I do enjoy this website and the wide selection. I would like to see more untreated stones. I also wasn't able to see my past order when I logged in.

Posted By Great selection, ok website in July, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I was able to find what i needed once I worked out what I was looking for.

Posted By Dr Kenneth in August, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Great site for finding specific stones and sizes for individual pieces of jewelry

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