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
2.69ctw Red Spessartite Garnet, Round, VS

2.69ctw Red Spessartite Garnet, Round, VS

4.2 mm

$ 126.49

View Gem
4.08ctw Orange Hessonite Garnet, Square, VS-SI
Hessonite Garnet Product Video (392989)

4.08ctw Orange Hessonite Garnet, Square, VS-SI

7 x 7 mm (calibrated)

$ 89.40

View Gem
3.04ctw Multicolor Opal, Round, Transparent

3.04ctw Multicolor Opal, Round, Transparent

6.5 mm (calibrated)

$ 70.97

View Gem
1.15ct Brown Diamond, Cushion, VS-SI
Diamond Product Video (460448)

1.15ct Brown Diamond, Cushion, VS-SI

6.3 x 5.6 mm

$ 2,645.87

View Gem
1.20ct Orange Hessonite Garnet, Pear Shape, SI

1.20ct Orange Hessonite Garnet, Pear Shape, SI

8 x 5.7 mm

$ 26.29

View Gem
21.61ct Violet Amethyst, Emerald Cut, VVS

21.61ct Violet Amethyst, Emerald Cut, VVS

20 x 15 mm (calibrated)

$ 150.66

View Gem
48.18ct Violet Charoite, Fancy, Opaque

48.18ct Violet Charoite, Fancy, Opaque

42.4 x 20.8 mm

$ 90.27

View Gem
26.09ct Multicolor Fluorite, Pear Shape, VS-SI

26.09ct Multicolor Fluorite, Pear Shape, VS-SI

23.8 x 17.1 mm

$ 57.43

View Gem
3.65ctw Orange Hessonite Garnet, Square, VS

3.65ctw Orange Hessonite Garnet, Square, VS

6.7 x 6.7 mm

$ 79.98

View Gem
2.97ct Pink Strawberry Quartz, Round, Translucent

2.97ct Pink Strawberry Quartz, Round, Translucent

9 mm (calibrated)

$ 18.16

View Gem
1.56ctw Multicolor Andalusite, Oval, VS

1.56ctw Multicolor Andalusite, Oval, VS

5.1 x 3.1 mm

$ 83.35

View Gem
3.43ctw Yellow Tourmaline, Oval, VS

3.43ctw Yellow Tourmaline, Oval, VS

7 x 5.5 mm

$ 136.52

View Gem
23.10ct Turquoise Cat'S Eye Aquamarine, Oval, Translucent
Cat's Eye Aquamarine Product Video (382735)

23.10ct Turquoise Cat'S Eye Aquamarine, Oval, Translucent

19.5 x 15.6 mm

$ 405.94

View Gem
23.57ct Blue Aquamarine, Emerald Cut, VVS
Aquamarine Product Video (486948)

23.57ct Blue Aquamarine, Emerald Cut, VVS

30.7 x 9.5 mm

$ 3,521.36

View Gem
4.30ctw Orange Sunstone, Oval, Transparent

4.30ctw Orange Sunstone, Oval, Transparent

10 x 8 mm (calibrated)

$ 27.48

View Gem
3.71ctw Brown Smoky Quartz, Round, VS

3.71ctw Brown Smoky Quartz, Round, VS

8 mm (calibrated)

$ 8.13

View Gem
2.64ct Pink Tourmaline, Emerald Cut, SI

2.64ct Pink Tourmaline, Emerald Cut, SI

10.3 x 5.8 mm

$ 115.69

View Gem
12.97ctw Black Spinel, Heart, Opaque

12.97ctw Black Spinel, Heart, Opaque

12 x 12 mm (calibrated)

$ 71.06

View Gem
3.45ctw Brown Diamond, Square, VS-SI
Diamond Product Video (460460)

3.45ctw Brown Diamond, Square, VS-SI

6.8 x 6.6 mm

$ 7,937.62

View Gem
25.34ctw Black Spinel, Baguette, Opaque
Spinel Product Video (372542)

25.34ctw Black Spinel, Baguette, Opaque

17.6 x 8.2 mm

$ 199.33

View Gem
1.06ct Orange Hessonite Garnet, Round, VS

1.06ct Orange Hessonite Garnet, Round, VS

6 mm (calibrated)

$ 18.51

View Gem
64.77ct Multicolor Jasper, Oval, Opaque

64.77ct Multicolor Jasper, Oval, Opaque

45.8 x 27.8 mm

$ 26.62

View Gem
2.08ct Orange Hessonite Garnet, Emerald Cut, VS-SI

2.08ct Orange Hessonite Garnet, Emerald Cut, VS-SI

9 x 6 mm (calibrated)

$ 34.31

View Gem
23.41ct Green Cat'S Eye Aquamarine, Oval, Translucent
Cat's Eye Aquamarine Product Video (363233)

23.41ct Green Cat'S Eye Aquamarine, Oval, Translucent

17.3 x 14.6 mm

$ 396.37

View Gem
1 2 3
...
48
Choose Page
1 - 1876

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

Great website, easy to navigate, and loads quickly. Have bought here before, very pleased!

Posted By SallyO in February, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Web site is very simple to navigate Selection is terrific

Posted By ToRa.62 in April, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection. Maybe too great i kept adding and deleting stuff because i found better looking ones

Posted By Edsor works in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.

Posted By Kelly in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.

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