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
1.75ct Green Tourmaline, Oval, Transparent

1.75ct Green Tourmaline, Oval, Transparent

9 x 7 mm (calibrated)

$ 30.00

View Gem
0.19ct Yellow Sphalerite, Round, SI

0.19ct Yellow Sphalerite, Round, SI

3.3 mm

$ 9.46

View Gem
3.99ctw Green Prehnite, Round, Transparent

3.99ctw Green Prehnite, Round, Transparent

7.5 mm (calibrated)

$ 21.68

View Gem
6.56ct Brown Smoky Quartz, Emerald Cut, VS

6.56ct Brown Smoky Quartz, Emerald Cut, VS

12 x 12 mm (calibrated)

$ 35.94

View Gem
1.32ct Green Sphene, Oval, Transparent

1.32ct Green Sphene, Oval, Transparent

6.8 x 5.9 mm

$ 6.57

View Gem
1.52ct Yellow Citrine, Round, VVS

1.52ct Yellow Citrine, Round, VVS

8 mm (calibrated)

$ 10.09

View Gem
5.76ct Brown Opal, Oval, Opaque

5.76ct Brown Opal, Oval, Opaque

12.2 x 10.6 mm

$ 28.80

View Gem
5.59ct Multicolor Fire Agate, Fancy, Opaque

5.59ct Multicolor Fire Agate, Fancy, Opaque

11 x 11 mm (calibrated)

$ 43.67

View Gem
0.73ct Yellow Beryl, Pear Shape, VVS-VS

0.73ct Yellow Beryl, Pear Shape, VVS-VS

7 x 5 mm (calibrated)

$ 14.54

View Gem
14.37ct Multicolor Boulder Opal, Oval, Opaque

14.37ct Multicolor Boulder Opal, Oval, Opaque

16.4 x 13.1 mm

$ 100.19

View Gem
28.79ctw Multicolor Jasper, Marquise, Opaque

28.79ctw Multicolor Jasper, Marquise, Opaque

31 x 12.9 mm

$ 47.31

View Gem
2.85ctw Yellow Citrine, Square, VS

2.85ctw Yellow Citrine, Square, VS

7 x 7 mm (calibrated)

$ 19.80

View Gem
0.49ct Purple Spinel, Cushion, VS

0.49ct Purple Spinel, Cushion, VS

6.7 x 4.2 mm

$ 34.16

View Gem
1.37ct Pink Tourmaline, Oval, VS
Tourmaline Product Video (747440)

1.37ct Pink Tourmaline, Oval, VS

7 x 6.2 mm

$ 204.68

View Gem
3.41ct White Topaz, Round, VVS-VS

3.41ct White Topaz, Round, VVS-VS

9 mm (calibrated)

$ 26.15

View Gem
1.30ct White Rainbow Moonstone, Oval, Transparent

1.30ct White Rainbow Moonstone, Oval, Transparent

8.4 x 6.4 mm

$ 42.74

View Gem
0.96ct Blue Kyanite, Oval, VS

0.96ct Blue Kyanite, Oval, VS

7 x 5 mm (calibrated)

$ 23.90

View Gem
11.18ctw Green Amazonite, Cushion, Opaque

11.18ctw Green Amazonite, Cushion, Opaque

10 x 10 mm (calibrated)

$ 27.19

View Gem
1.31ctw Multicolor Opal, Oval, Transparent

1.31ctw Multicolor Opal, Oval, Transparent

7 x 5 mm (calibrated)

$ 57.41

View Gem
1.76ct Pink Strawberry Quartz, Round, Translucent

1.76ct Pink Strawberry Quartz, Round, Translucent

8 mm (calibrated)

$ 13.50

View Gem
0.13ct Pink Morganite, Round, VS

0.13ct Pink Morganite, Round, VS

3.5 mm (calibrated)

$ 5.40

View Gem
1.88ct Yellow Citrine, Round, VVS

1.88ct Yellow Citrine, Round, VVS

8 mm (calibrated)

$ 13.11

View Gem
2.37ct Orange Spessartite Garnet, Oval, Transparent

2.37ct Orange Spessartite Garnet, Oval, Transparent

8 x 7.3 mm

$ 59.01

View Gem
4.39ctw Red Pyrope Garnet, Square, VS

4.39ctw Red Pyrope Garnet, Square, VS

4 x 4 mm (calibrated)

$ 33.66

View Gem
1 2 3
...
176
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 -> 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

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

I liked the selection of gems, and price. I did not like your PayPal process. I already have a PP account and you want me to sign up for another.

Posted By CLTCJH in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

IT WAS GREAT SIMPLE I WAS ABLE TO MAKE AN ACCOUNT EASY AND WAS ABLE TO FAVORITE ALL OF MY FINAL SELECTED GEMS, I JUST LOVE IT.

Posted By YE in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Enjoy every moment

Posted By Ferns in October, 2025
Source: Bizrate

Overall Rating -> 8 star ratings

I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.

Posted By Meyeusername in March, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
Enlarged Gemstone Image