Diamond Size-Round

Round Diamond Size Chart

Size (Sieve)	Diameter Size (Millimeter)	Size (Carats)	Number of Diamonds per Carat
-00000	0.60 mm	0.002 ct	630
-0000+00000	0.70 mm	0.0025 ct	430
-000+0000	0.80 mm	0.003 ct	330
-00+000	0.90 mm	0.004 ct	275
-0+00	1.00 mm	0.005 ct	200
-1+0	1.10 mm	0.006 ct	167
-2+1	1.15 mm	0.007 ct	143
-2½+2	1.20 mm	0.008 ct	125
-2¾+2½	1.25 mm	0.009 ct	110
-3+2¾	1.30 mm	0.01 ct	100
-3½+3	1.35 mm	0.011 ct	90
-4+3½	1.40 mm	0.0125 ct	80
-4½+4	1.45 mm	0.014 ct	70
-5+4½	1.50 mm	0.016 ct	62
-5½+5	1.55 mm	0.02 ct	50
-6+5½	1.60 mm	0.021 ct	48
-6½+6	1.70 mm	0.022 ct	45
-7+6½	1.80 mm	0.028 ct	35
-7½+7	1.90 mm	0.03 ct	33
-8+7½	2.00 mm	0.035 ct	30
-8½+8	2.10 mm	0.04 ct	25
-9+8½	2.20 mm	0.045 ct	22
-9½+9	2.30 mm	0.05 ct	20
-10+9½	2.40 mm	0.055 ct	18
-10½+10	2.50 mm	0.06 ct	17
-11+10½	2.60 mm	0.07 ct	14
-11½+11	2.70 mm	0.08 ct	13
-12+11½	2.80 mm	0.085 ct	12
-12½+12	2.90 mm	0.09 ct	11
-13+12½	3.00 mm	0.10 ct	10
-13½+13	3.10 mm	0.11 ct	9
-14+13½	3.20 mm	0.125 ct	8
-14½+14	3.30 mm	0.13 ct	7.5
-15+14½	3.40 mm	0.15 ct	6.5
-15½+15	3.50 mm	0.17 ct	6
-16+15½	3.60 mm	0.18 ct	5.5
-16½+16	3.70 mm	0.19 ct	5.25
-17+16½	3.80 mm	0.21 ct	4.8
-17½+17	3.90 mm	0.22 ct	4.5
-18+17½	4.00 mm	0.23 ct	4.25
-18½+18	4.10 mm	0.25 ct	4
-19+18½	4.20 mm	0.27 ct	3.73
-19½+19	4.30 mm	0.30 ct	3.33
-20+19½	4.40 mm	0.33 ct	3
	4.50 mm	0.36 ct	2.78
	4.75 mm	0.44 ct	2.27
	5.00 mm	0.50 ct	2.00
	5.25 mm	0.56 ct	1.79
	5.50 mm	0.66 ct	1.52
	5.80 mm	0.75 ct	1.33
	6.00 mm	0.84 ct	1.19
	6.25 mm	0.93 ct	1.08
	6.50 mm	1.00 ct	1.00
	6.75 mm	1.10 ct	0.90
	7.00 mm	1.30 ct	0.77
	7.30 mm	1.50 ct	0.67
	7.50 mm	1.67 ct	0.60
	7.75 mm	1.75 ct	0.57
	8.00 mm	2.00 ct	0.50
	8.75 mm	2.50 ct	0.40
	9.00 mm	2.75 ct	0.36
	9.10 mm	3.00 ct	0.33
	10.20 mm	4.00 ct	0.25
	10.75 mm	4.50 ct	0.22
	11.10 mm	5.00 ct	0.20