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 Calibrated Gemstones Round Shape 12 mm Gems

Buy 12 mm Round Calibrated Gemstones from GemSelect

Round Shape 12 mm Gems Weight
Round Shape 12 mm Gems Size
Round Shape 12 mm Gems Clarity
Round Shape 12 mm Gems Price

Size Explained

Choose Size or Size Range
For Example: 6-7
For Example: 8-9
Bi-color
Black Round Shape 12 mm Gems
Blue Round Shape 12 mm Gems
Brown Round Shape 12 mm Gems
Golden
Gray Round Shape 12 mm Gems
Green Round Shape 12 mm Gems
Multicolor Round Shape 12 mm Gems
Orange Round Shape 12 mm Gems
Pink Round Shape 12 mm Gems
Purple
Red Round Shape 12 mm Gems
Turquoise Round Shape 12 mm Gems
Violet Round Shape 12 mm Gems
White Round Shape 12 mm Gems
Yellow Round Shape 12 mm Gems
Single
Pairs
Lots
Faceted
Cabochons
Clear All

11.10ctw Multicolor Pietersite, Round, Opaque

12 mm (calibrated)

$ 26.20

View Gem

5.18ct Brown Smoky Quartz, Round, VVS-VS

12 mm (calibrated)

$ 8.52

View Gem

4.78ct Brown Smoky Quartz, Round, VVS-VS

12 mm (calibrated)

$ 7.86

View Gem

5.42ct Yellow Quartz, Round, VVS

12 mm (calibrated)

$ 29.69

View Gem

6.67ct Brown Smoky Quartz, Round, VVS

12 mm (calibrated)

$ 21.92

View Gem

13.08ct White Rutile Quartz, Sphere / Ball, Translucent

12 mm (calibrated)

$ 15.04

View Gem

5.43ct Brown Smoky Quartz, Round, VVS

12 mm (calibrated)

$ 14.88

View Gem

6.56ct Blue Larimar, Round, Opaque

12 mm (calibrated)

$ 74.96

View Gem

12.31ct White Rutile Quartz, Sphere / Ball, Translucent

12 mm (calibrated)

$ 14.16

View Gem

5.98ct Yellow Citrine, Round, VVS

12 mm (calibrated)

$ 45.87

View Gem

4.90ct Brown Smoky Quartz, Round, VS

12 mm (calibrated)

$ 8.06

View Gem

4.94ct Brown Smoky Quartz, Round, VVS-VS

12 mm (calibrated)

$ 27.06

View Gem

8.90ct Black Star Diopside, Round, Opaque

12 mm (calibrated)

$ 44.32

View Gem

4.85ct Green Seraphinite, Round, Opaque

12 mm (calibrated)

$ 4.69

View Gem

3.43ct Multicolor Pietersite, Round, Opaque

12 mm (calibrated)

$ 8.30

View Gem

13.90ctw Green Jadeite, Round, Translucent

12 mm (calibrated)

$ 45.68

View Gem

5.08ct Multicolor Mystic Quartz, Round, VVS-VS

12 mm (calibrated)

$ 15.18

View Gem

5.13ct Multicolor Mystic Quartz, Round, VVS-VS

12 mm (calibrated)

$ 15.33

View Gem

7.97ct White Quartz Cat'S Eye, Round, Transparent

12 mm (calibrated)

$ 28.38

View Gem

6.14ct Yellow Citrine, Round, VVS

12 mm (calibrated)

$ 39.24

View Gem

10.10ct Multicolor Agate, Round, Opaque

12 mm (calibrated)

$ 9.56

View Gem

23.84ctw Multicolor Jasper, Sphere / Ball, Opaque

12 mm (calibrated)

$ 26.11

View Gem

4.89ct Brown Smoky Quartz, Round, VVS

12 mm (calibrated)

$ 16.08

View Gem

6.27ct White Quartz, Round, VVS

12 mm (calibrated)

$ 8.87

View Gem

Why Buy Round Shape 12 Mm Gems from GemSelect?

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

Posted By Niska in August, 2025
Source: Bizrate

Overall Rating -> 7 star ratings

easy interface for a pricless buy

Posted By Zeak in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Everything was great, website user friendly, quality amazing, communication amazing, delivery amazing, everything was as expected, they done what they said they would, overall experience was amazing.

Posted By Jac in July, 2025
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

Very good.

Posted By Tommy in December, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Always get a nice gemstone. Just like the picture. Never disappointed

Posted By Ron T in June, 2026
Source: Bizrate
Enlarged Gemstone Image