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
2.91ctw Blue Kyanite, Oval, SI

2.91ctw Blue Kyanite, Oval, SI

8 x 6 mm (calibrated)

$ 50.48

View Gem
57.85ct Blue Larimar, Fancy, Opaque
Larimar Product Video (492445)

57.85ct Blue Larimar, Fancy, Opaque

31.4 x 30.1 mm

$ 570.47

View Gem
33.05ct Multicolor Pietersite, Oval, Opaque

33.05ct Multicolor Pietersite, Oval, Opaque

30 x 22 mm (calibrated)

$ 108.63

View Gem
9.86ct Multicolor Fire Agate, Fancy, Opaque

9.86ct Multicolor Fire Agate, Fancy, Opaque

16.9 x 12.3 mm

$ 77.35

View Gem
127.45ct Purple Star Ruby, Oval, Opaque
Star Ruby Product Video (513650)

127.45ct Purple Star Ruby, Oval, Opaque

28.6 x 26.2 mm

$ 1,745.43

View Gem
16.89ct Brown Moonstone, Round, Translucent

16.89ct Brown Moonstone, Round, Translucent

17 mm (calibrated)

$ 46.26

View Gem
23.21ctw Multicolor Pietersite, Fancy, Opaque

23.21ctw Multicolor Pietersite, Fancy, Opaque

31.2 x 18.6 mm

$ 87.61

View Gem
121.07ct Multicolor Chrysocolla, Trillion, Opaque
Chrysocolla Product Video (658616)

121.07ct Multicolor Chrysocolla, Trillion, Opaque

45.1 x 40.4 mm

$ 206.21

View Gem
0.23ct Yellow Diamond, Round, VS
Diamond Product Video (564615)

0.23ct Yellow Diamond, Round, VS

4 mm (calibrated)

$ 419.90

View Gem
0.25ctw White Diamond, Round, VVS-VS
Diamond Product Video (565079)

0.25ctw White Diamond, Round, VVS-VS

3 mm (calibrated)

$ 378.51

View Gem
0.90ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

0.90ct Yellow Color-Change Diaspore, Emerald Cut, VVS-VS

7 x 4.4 mm

$ 27.61

View Gem
25.67ctw Brown Tiger'S Eye, Sphere / Ball, Opaque

25.67ctw Brown Tiger'S Eye, Sphere / Ball, Opaque

12 mm (calibrated)

$ 22.50

View Gem
40.83ct Multicolor Agate Geode, Fancy, Opaque
Agate Geode Product Video (391994)

40.83ct Multicolor Agate Geode, Fancy, Opaque

27.6 x 27.5 mm

$ 44.91

View Gem
6.50ct Blue Larimar, Round, Opaque

6.50ct Blue Larimar, Round, Opaque

12 mm (calibrated)

$ 74.27

View Gem
0.25ct Yellow Diamond, Round, VS-SI
Diamond Product Video (564633)

0.25ct Yellow Diamond, Round, VS-SI

4 mm (calibrated)

$ 380.34

View Gem
9.68ct Purple Kunzite, Pear Shape, VVS-VS
Kunzite Product Video (691480)

9.68ct Purple Kunzite, Pear Shape, VVS-VS

15.2 x 10.9 mm

$ 266.39

View Gem
2.99ct Brown Cat'S Eye Scapolite, Round, Translucent

2.99ct Brown Cat'S Eye Scapolite, Round, Translucent

9.5 mm (calibrated)

$ 16.38

View Gem
1.29ct Yellow Chrysoberyl, Pear Shape, VS
Chrysoberyl Product Video (366654)

1.29ct Yellow Chrysoberyl, Pear Shape, VS

8 x 6 mm (calibrated)

$ 150.34

View Gem
11.46ct Yellow Apatite, Oval, VS
Apatite Product Video (614758)

11.46ct Yellow Apatite, Oval, VS

16 x 12 mm (calibrated)

$ 520.69

View Gem
3.23ctw Multicolor Andalusite, Round, VS-SI
Andalusite Product Video (310827)

3.23ctw Multicolor Andalusite, Round, VS-SI

4 mm (calibrated)

$ 143.42

View Gem
2.50ct Green Peridot, Cushion, VS
Peridot Product Video (332275)

2.50ct Green Peridot, Cushion, VS

9.7 x 7.5 mm

$ 82.17

View Gem
24.94ct Multicolor Rhodochrosite, Pear Shape, Opaque

24.94ct Multicolor Rhodochrosite, Pear Shape, Opaque

34.5 x 13.3 mm

$ 68.32

View Gem
1.13ct Yellow Chrysoberyl, Pear Shape, VVS-VS
Chrysoberyl Product Video (366561)

1.13ct Yellow Chrysoberyl, Pear Shape, VVS-VS

8.2 x 5.6 mm

$ 131.69

View Gem
9.29ctw Pink Morganite, Round, Translucent

9.29ctw Pink Morganite, Round, Translucent

10 mm (calibrated)

$ 101.78

View Gem
1 2 3
...
39
Choose Page
1 - 1883

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 -> 10 star ratings

Very good place to buy gemstones

Posted By Elansary in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Have made 2 purchases so far from GemSelect and they have been amazing! Anytime I requested additional info, videos or pictures of a particular item, the response was always timely and helpful. This is a great place to buy, if you are looking for loose stones. Highly recommend!

Posted By Britnee Rose in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

this site is awesome. I was able to look at the products think about purchasing and come back and find the same products. With the amount of inventory gem select has. Its awesome to be able to filter the way that they allow you too.

Posted By Tommyp in November, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.

Posted By Atsuhisa in January, 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 -> 10 star ratings

My experience was done with ease

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