X
Gemstone Search

Your Details

Please fill in your email address

Please fill in a password

Forgot your password?

Buy Round Shape 12 mm Gems

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 Round Shape 12 mm Gems
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
  • Actual Product Photos
  • Reliable Quality
  • Full Transparency
  • Large Selection
  • Affordable Prices
  • Fast, Secure Global Shipping
ID: 384492
Weight: 13.84ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 54.80
Item in Stock
More Options & Item Details
Add to Cart
ID: 636397
Weight: 8.90ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 26.06
Item in Stock
More Options & Item Details
Add to Cart
ID: 721361
Weight: 7.22ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 8.66
Item in Stock
More Options & Item Details
Add to Cart
ID: 497341
Weight: 6.46ct
Size: 13 mm (calibrated)
Clarity: VS
Content: 1 pc
Price: $ 42.64
Item in Stock
More Options & Item Details
Add to Cart
ID: 724822
Weight: 7.68ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 8.76
Item in Stock
More Options & Item Details
Add to Cart
ID: 501254
Weight: 5.91ct
Size: 12 mm (calibrated)
Clarity: VVS
Content: 1 pc
Price: $ 54.61
Item in Stock
More Options & Item Details
Add to Cart
ID: 470007
Weight: 12.72ct
Size: 12 mm (calibrated)
Clarity: Translucent
Content: 1 pc
Price: $ 17.64
Item in Stock
More Options & Item Details
Add to Cart
ID: 500970
Weight: 5.59ct
Size: 12 mm (calibrated)
Clarity: VVS
Content: 1 pc
Price: $ 51.65
Item in Stock
More Options & Item Details
Add to Cart
ID: 463931
Weight: 5.09ct
Size: 12 mm (calibrated)
Clarity: VVS-VS
Content: 1 pc
Price: $ 10.08
Item in Stock
More Options & Item Details
Add to Cart
ID: 526453
Weight: avg. 12.26 ct / each
Size: 12 mm (calibrated)
Clarity: Opaque
Price: $ 14.83
Item in Stock
More Options & Item Details
Select pcs
Add to Cart
ID: 601898
Weight: 4.90ct
Size: 12 mm (calibrated)
Clarity: VVS
Content: 1 pc
Price: $ 23.80
Item in Stock
More Options & Item Details
Add to Cart
ID: 701057
Weight: 13.98ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 13.42
Item in Stock
More Options & Item Details
Add to Cart
ID: 567162
Weight: 5.60ct
Size: 12 mm (calibrated)
Clarity: Transparent
Content: 1 pc
Price: $ 16.92
Item in Stock
More Options & Item Details
Add to Cart
ID: 612075
Weight: 5.58ct
Size: 12 mm (calibrated)
Clarity: VVS
Content: 1 pc
Price: $ 22.09
Item in Stock
More Options & Item Details
Add to Cart
ID: 335787
Weight: 12.24ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 201.96
Item in Stock
More Options & Item Details
Add to Cart
ID: 384537
Weight: 13.73ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 54.37
Item in Stock
More Options & Item Details
Add to Cart
ID: 378272
Weight: 12.95ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 51.29
Item in Stock
More Options & Item Details
Add to Cart
ID: 408782
Weight: 6.27ct
Size: 12 mm (calibrated)
Clarity: VVS
Price: $ 10.69
Item in Stock
More Options & Item Details
Select pcs
Add to Cart
ID: 655865
Weight: 6.66ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 10.39
Item in Stock
More Options & Item Details
Add to Cart
ID: 470008
Weight: 11.38ct
Size: 12 mm (calibrated)
Clarity: Translucent
Content: 1 pc
Price: $ 15.78
Item in Stock
More Options & Item Details
Add to Cart
ID: 338211
Weight: 13.34ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 263.34
Item in Stock
More Options & Item Details
Add to Cart
ID: 505538
Weight: 6.92ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 95.24
Item in Stock
More Options & Item Details
Add to Cart
ID: 500972
Weight: 6.16ct
Size: 12 mm (calibrated)
Clarity: VVS
Content: 1 pc
Price: $ 56.92
Item in Stock
More Options & Item Details
Add to Cart
ID: 619994
Weight: 9.29ct (total)
Size: 12 mm (calibrated)
Clarity: Translucent
Content: 2 pcs
Price: $ 24.53
Item in Stock
More Options & Item Details
Add to Cart
ID: 360547
Weight: 7.63ct
Size: 12 mm (calibrated)
Clarity: Transparent
Content: 1 pc
Price: $ 40.28
Item in Stock
More Options & Item Details
Add to Cart
ID: 361818
Weight: 25.59ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 33.78
Item in Stock
More Options & Item Details
Add to Cart
ID: 715016
Weight: 11.18ct (total)
Size: 12 mm (calibrated)
Clarity: Translucent
Content: 2 pcs
Price: $ 28.98
Item in Stock
More Options & Item Details
Add to Cart
ID: 598890
Weight: 6.06ct
Size: 12 mm (calibrated)
Clarity: Transparent
Content: 1 pc
Price: $ 29.04
Item in Stock
More Options & Item Details
Add to Cart
ID: 693223
Weight: 7.88ct
Size: 12 mm (calibrated)
Clarity: Translucent
Content: 1 pc
Price: $ 7.56
Item in Stock
More Options & Item Details
Add to Cart
ID: 438369
Weight: 13.97ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 55.32
Item in Stock
More Options & Item Details
Add to Cart
ID: 567281
Weight: 6.08ct
Size: 12 mm (calibrated)
Clarity: Transparent
Content: 1 pc
Price: $ 18.37
Item in Stock
More Options & Item Details
Add to Cart
ID: 600301
Weight: 5.32ct
Size: 12 mm (calibrated)
Clarity: Transparent
Content: 1 pc
Price: $ 21.19
Item in Stock
More Options & Item Details
Add to Cart
ID: 602886
Weight: 5.59ct
Size: 12 mm (calibrated)
Clarity: VVS
Content: 1 pc
Price: $ 27.08
Item in Stock
More Options & Item Details
Add to Cart
ID: 476907
Weight: 7.68ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 30.41
Item in Stock
More Options & Item Details
Add to Cart
ID: 361823
Weight: 26.18ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 34.56
Item in Stock
More Options & Item Details
Add to Cart
ID: 384555
Weight: 13.47ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 53.34
Item in Stock
More Options & Item Details
Add to Cart
ID: 438492
Weight: 13.75ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 54.46
Item in Stock
More Options & Item Details
Add to Cart
ID: 463935
Weight: 5.24ct
Size: 12 mm (calibrated)
Clarity: VS
Content: 1 pc
Price: $ 10.38
Item in Stock
More Options & Item Details
Add to Cart
ID: 700727
Weight: 12.89ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 12.37
Item in Stock
More Options & Item Details
Add to Cart
ID: 505430
Weight: 6.79ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 93.46
Item in Stock
More Options & Item Details
Add to Cart
ID: 361821
Weight: 24.57ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 32.44
Item in Stock
More Options & Item Details
Add to Cart
ID: 700721
Weight: 12.25ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 11.76
Item in Stock
More Options & Item Details
Add to Cart
ID: 501187
Weight: 5.28ct
Size: 12 mm (calibrated)
Clarity: VVS
Content: 1 pc
Price: $ 40.66
Item in Stock
More Options & Item Details
Add to Cart
ID: 600294
Weight: 5.31ct
Size: 12 mm (calibrated)
Clarity: Transparent
Content: 1 pc
Price: $ 25.37
Item in Stock
More Options & Item Details
Add to Cart
ID: 501193
Weight: 5.88ct
Size: 12 mm (calibrated)
Clarity: VVS
Content: 1 pc
Price: $ 45.28
Item in Stock
More Options & Item Details
Add to Cart
ID: 501043
Weight: 6.95ct
Size: 12 mm (calibrated)
Clarity: VVS-VS
Content: 1 pc
Price: $ 64.22
Item in Stock
More Options & Item Details
Add to Cart
ID: 699644
Weight: 5.12ct
Size: 12 mm (calibrated)
Clarity: VVS-VS
Content: 1 pc
Price: $ 18.43
Item in Stock
More Options & Item Details
Add to Cart
ID: 548388
Weight: 14.10ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 52.85
Item in Stock
More Options & Item Details
Add to Cart
ID: 361820
Weight: 22.63ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 29.87
Item in Stock
More Options & Item Details
Add to Cart
ID: 710374
Weight: 6.13ct
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 1 pc
Price: $ 14.90
Item in Stock
More Options & Item Details
Add to Cart
ID: 417642
Weight: 7.37ct
Size: 12 mm (calibrated)
Clarity: VVS-VS
Content: 1 pc
Price: $ 15.56
Item in Stock
More Options & Item Details
Add to Cart
ID: 607799
Weight: 5.20ct
Size: 12 mm (calibrated)
Clarity: VVS-VS
Content: 1 pc
Price: $ 34.32
Item in Stock
More Options & Item Details
Add to Cart
ID: 369620
Weight: 7.50ct
Size: 12 mm (calibrated)
Clarity: Transparent
Content: 1 pc
Price: $ 32.08
Item in Stock
More Options & Item Details
Add to Cart
ID: 438380
Weight: 12.72ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 50.38
Item in Stock
More Options & Item Details
Add to Cart
ID: 600298
Weight: 5.17ct
Size: 12 mm (calibrated)
Clarity: Transparent
Price: $ 24.71
Item in Stock
More Options & Item Details
Select pcs
Add to Cart
ID: 501264
Weight: 6.07ct
Size: 12 mm (calibrated)
Clarity: VVS
Content: 1 pc
Price: $ 56.09
Item in Stock
More Options & Item Details
Add to Cart
ID: 602728
Weight: 5.29ct
Size: 12 mm (calibrated)
Clarity: VVS
Content: 1 pc
Price: $ 25.62
Item in Stock
More Options & Item Details
Add to Cart
ID: 361826
Weight: 23.84ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 31.46
Item in Stock
More Options & Item Details
Add to Cart
ID: 438373
Weight: 14.92ct (total)
Size: 12 mm (calibrated)
Clarity: Opaque
Content: 2 pcs
Price: $ 59.09
Item in Stock
More Options & Item Details
Add to Cart
ID: 619989
Weight: 8.10ct (total)
Size: 12 mm (calibrated)
Clarity: Translucent
Content: 2 pcs
Price: $ 21.38
Item in Stock
More Options & Item Details
Add to Cart

GemSelect Certified Store Reviews

GemSelect: Over 18 Years in the Gemstone Business! Thank you for trusting us with your purchase!

Overall Rating -> 8 star ratings

great experience

Posted By T in December, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.

Posted By G.W. in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I love the quality, package and info of your gems.

Posted By Diana in April, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

looked at pink stones and at sapphires bought some sapphires. I love looking and collecting gemstones. .

Posted By Steven M. in February, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Had no difficulty with the website. The only difficulty I had today was making the choice of what I wanted to purchase. There are just so many delicious stones to choose from!!

Posted By Desertchick in July, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

Always find more niche sizes/shapes as my unconventional designs require from this website. Recommending to fellow designers in the creative atmosphere on the usual, specially due to the quality and certification of gems.

Posted By Sina in April, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Its been a long time since Ive made any purchases Im satisfied with the quality.

Posted By Hard Case in December, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

went well

Posted By Doug in May, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very good Hoping you will increase your inventory especially in the 6mm Thanks

Posted By Ibie in February, 2025
Source: Bizrate

Some people by gems by color or price, but for many, it is best to buy gems by shape and size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated Round shapes, facet cut and cabochon gems available now in 12 mm diameter size range. Shop a wide range of calibrated gemstones by size online at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not usually expected to be cut to exact measurements. For calibrated gemstones weighing under one carat, most jewelry settings will accommodate a gem which is within 0.2 mm of the calibrated size in order to fit a standard setting. For gemstones that weigh over one carat, a larger variance is acceptable, often around 0.3 mm or slightly higher even. This small variance can usually be accommodated for standard style settings. Round-cut gemstones should also have a greater variance in acceptable size when it comes to calibration; in fact it is usually possible to mount a round stone of any size in the closest standard setting.

Read All

Over 19 Years in the Gemstone Business!

Thank you for trusting us with your purchase!

Overall Rating -> 8 star ratings

great experience

Posted By T in December, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.

Posted By G.W. in June, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I love the quality, package and info of your gems.

Posted By Diana in April, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

looked at pink stones and at sapphires bought some sapphires. I love looking and collecting gemstones. .

Posted By Steven M. in February, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Had no difficulty with the website. The only difficulty I had today was making the choice of what I wanted to purchase. There are just so many delicious stones to choose from!!

Posted By Desertchick in July, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

Always find more niche sizes/shapes as my unconventional designs require from this website. Recommending to fellow designers in the creative atmosphere on the usual, specially due to the quality and certification of gems.

Posted By Sina in April, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Its been a long time since Ive made any purchases Im satisfied with the quality.

Posted By Hard Case in December, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

went well

Posted By Doug in May, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Very good Hoping you will increase your inventory especially in the 6mm Thanks

Posted By Ibie in February, 2025
Source: Bizrate
Enlarged Gemstone Image