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Round Diamond Size Chart

Round Diamond Size Chart

Size (Sieve) Diameter Size (Millimeter) Size (Carats) Number of Diamonds per Carat
-000000.60 mm0.002 ct630
-0000+000000.70 mm0.0025 ct430
-000+00000.80 mm0.003 ct330
-00+0000.90 mm0.004 ct275
-0+001.00 mm0.005 ct200
-1+01.10 mm0.006 ct167
-2+11.15 mm0.007 ct143
-2½+21.20 mm0.008 ct125
-2¾+2½1.25 mm0.009 ct110
-3+2¾1.30 mm0.01 ct100
-3½+31.35 mm0.011 ct90
-4+3½1.40 mm0.0125 ct80
-4½+41.45 mm0.014 ct70
-5+4½1.50 mm0.016 ct62
-5½+51.55 mm0.02 ct50
-6+5½1.60 mm0.021 ct48
-6½+61.70 mm0.022 ct45
-7+6½1.80 mm0.028 ct35
-7½+71.90 mm0.03 ct33
-8+7½2.00 mm0.035 ct30
-8½+82.10 mm0.04 ct25
-9+8½2.20 mm0.045 ct22
-9½+92.30 mm0.05 ct20
-10+9½2.40 mm0.055 ct18
-10½+102.50 mm0.06 ct17
-11+10½2.60 mm0.07 ct14
-11½+112.70 mm0.08 ct13
-12+11½2.80 mm0.085 ct12
-12½+122.90 mm0.09 ct11
-13+12½3.00 mm0.10 ct10
-13½+133.10 mm0.11 ct9
-14+13½3.20 mm0.125 ct8
-14½+143.30 mm0.13 ct7.5
-15+14½3.40 mm0.15 ct6.5
-15½+153.50 mm0.17 ct6
-16+15½3.60 mm0.18 ct5.5
-16½+163.70 mm0.19 ct5.25
-17+16½3.80 mm0.21 ct4.8
-17½+173.90 mm0.22 ct4.5
-18+17½4.00 mm0.23 ct4.25
-18½+184.10 mm0.25 ct4
-19+18½4.20 mm0.27 ct3.73
-19½+194.30 mm0.30 ct3.33
-20+19½4.40 mm0.33 ct3
4.50 mm0.36 ct2.78
4.75 mm0.44 ct2.27
5.00 mm0.50 ct2.00
5.25 mm0.56 ct1.79
5.50 mm0.66 ct1.52
5.80 mm0.75 ct1.33
6.00 mm0.84 ct1.19
6.25 mm0.93 ct1.08
6.50 mm1.00 ct1.00
6.75 mm1.10 ct0.90
7.00 mm1.30 ct0.77
7.30 mm1.50 ct0.67
7.50 mm1.67 ct0.60
7.75 mm1.75 ct0.57
8.00 mm2.00 ct0.50
8.75 mm2.50 ct0.40
9.00 mm2.75 ct0.36
9.10 mm3.00 ct0.33
10.20 mm4.00 ct0.25
10.75 mm4.50 ct0.22
11.10 mm5.00 ct0.20