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
1.25ctw Red Pyrope Garnet, Pear Shape, VVS-VS

1.25ctw Red Pyrope Garnet, Pear Shape, VVS-VS

6.9 x 4.7 mm

$ 9.96

View Gem
2.57ct Pink Tourmaline, Emerald Cut, SI

2.57ct Pink Tourmaline, Emerald Cut, SI

9 x 6 mm (calibrated)

$ 194.28

View Gem
8.62ct Black Tourmaline, Cushion, Opaque

8.62ct Black Tourmaline, Cushion, Opaque

13.9 x 10.8 mm

$ 30.64

View Gem
11.03ct Green Prehnite, Fancy, Translucent

11.03ct Green Prehnite, Fancy, Translucent

16 x 12 mm (calibrated)

$ 18.12

View Gem
4.21ct Multicolor Opal, Oval, Transparent

4.21ct Multicolor Opal, Oval, Transparent

18.8 x 8.1 mm

$ 105.83

View Gem
15.89ctw Brown Rutile Quartz, Sphere / Ball, Transparent

15.89ctw Brown Rutile Quartz, Sphere / Ball, Transparent

10 mm (calibrated)

$ 17.41

View Gem
1.78ct Violet Amethyst, Pear Shape, VVS-VS

1.78ct Violet Amethyst, Pear Shape, VVS-VS

10 x 7 mm (calibrated)

$ 11.70

View Gem
0.36ct Yellow Chrysoberyl Cat'S Eye, Oval, Translucent

0.36ct Yellow Chrysoberyl Cat'S Eye, Oval, Translucent

4.4 x 4.4 mm

$ 10.76

View Gem
3.79ctw Yellow Sphene, Oval, Transparent

3.79ctw Yellow Sphene, Oval, Transparent

7.6 x 6.4 mm

$ 18.87

View Gem
52.74ct Multicolor Rhodochrosite, Oval, Translucent
Rhodochrosite Product Video (548715)

52.74ct Multicolor Rhodochrosite, Oval, Translucent

34 x 23.5 mm

$ 69.34

View Gem
1.94ct Orange Hessonite Garnet, Cushion, VS

1.94ct Orange Hessonite Garnet, Cushion, VS

7 x 7 mm (calibrated)

$ 28.90

View Gem
2.25ctw Violet Amethyst, Marquise, VVS-VS

2.25ctw Violet Amethyst, Marquise, VVS-VS

10 x 5 mm (calibrated)

$ 14.94

View Gem
1.70ctw Gray Sillimanite Cat'S Eye, Oval, Transparent

1.70ctw Gray Sillimanite Cat'S Eye, Oval, Transparent

6.7 x 4.4 mm

$ 5.59

View Gem
60.17ct Blue Sodalite, Square, Opaque

60.17ct Blue Sodalite, Square, Opaque

25.7 x 25.6 mm

$ 49.94

View Gem
0.85ct Green Tourmaline, Round, Transparent

0.85ct Green Tourmaline, Round, Transparent

5.5 mm (calibrated)

$ 14.57

View Gem
0.42ct Black Diamond, Square, Opaque

0.42ct Black Diamond, Square, Opaque

3.6 x 3.4 mm

$ 209.16

View Gem
10.22ct Red Almandine Garnet, Oval, VVS-VS
Almandine Garnet Product Video (732455)

10.22ct Red Almandine Garnet, Oval, VVS-VS

15.2 x 11 mm

$ 305.37

View Gem
1.93ct Green Tourmaline, Emerald Cut, VVS-VS

1.93ct Green Tourmaline, Emerald Cut, VVS-VS

15.5 x 3.9 mm

$ 52.87

View Gem
40.28ct Gray Hematite, Pear Shape, Opaque

40.28ct Gray Hematite, Pear Shape, Opaque

25.8 x 17.2 mm

$ 39.28

View Gem
17.13ct Multicolor Agate, Oval, Opaque

17.13ct Multicolor Agate, Oval, Opaque

16.9 x 15.3 mm

$ 16.20

View Gem
1.04ct White Sillimanite Cat'S Eye, Oval, Transparent

1.04ct White Sillimanite Cat'S Eye, Oval, Transparent

7 x 4.7 mm

$ 3.25

View Gem
0.50ct Orange Fire Opal, Oval, Transparent

0.50ct Orange Fire Opal, Oval, Transparent

6.9 x 5.7 mm

$ 14.43

View Gem
11.01ct Green Bloodstone, Oval, Opaque

11.01ct Green Bloodstone, Oval, Opaque

19.1 x 12.9 mm

$ 16.45

View Gem
1.73ct Yellow Citrine, Round, VVS-VS

1.73ct Yellow Citrine, Round, VVS-VS

8 mm (calibrated)

$ 12.06

View Gem
1 2 3
...
298
Choose Page
1 - 1882

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

Excellent options

Posted By CJ in February, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

Fast snd easy to find what I was looking for

Posted By Bawb in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Although the stones are smaller than I thought, I really don't think in millimeters, they are perfect. I plan to put one into a ring and the other into a necklace. Ordering was easy, contact kept me aware of how shipping was going, and delivery was sooner than expected. The quality of stones I have ordered in the past and this recent order is outstanding and stones I will be proud to wear.

Posted By Ktreva52 in June, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Easy and good price

Posted By Bry_guy in March, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Great! Affordable

Posted By Spinellope in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Took a chance on purchasing my gemstones from Gemselect and was impressed. 10/10

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