GROUP NAME
|
SIEVE SIZE
|
APPROX WT IN CARAT
|
-2
|
-2
|
<0.005
|
STARS
|
+2 TO -6.5
|
0.006 – 0.02
|
MELE
|
+6.5 TO -11
|
0.021 – 0.07
|
+11(BIG MELE)
|
+11 TO -14
|
0.08 – 0.13
|
+14
|
+14 TO -15.5
|
0.14 – 0.17
|
1/5TH
|
0.18 – 0.22
|
|
1/4TH (QUARTERS)
|
0.23 – 0.29
|
|
30 POINTERS
|
ABOVE 30 CENTS
|
|
40 POINTERS
|
ABOVE 40 CENTS
|
|
50 POINTERS
|
ABOVE 50 CENTS
|
|
SOLITAIRE
|
1.00 CARAT AND ABOVE
|
Generally, a customer would understand a solitaire as any single diamond, but the market understands it as above 1 carat. It is not advisable to do sieving for bigger sizes for the fear of the girdle and culet getting damaged. For bigger sizes, the weight of the individual stone is checked differently.
SIEVE NUMBER
|
DIAM(MM)
|
CARAT
|
+0.0 to -1.5
|
1.10
|
0.0066
|
+1.5 to -2.5
|
1.20
|
0.0086
|
+2.5 to -3.5
|
1.25
|
0.0098
|
+3.5 to -4.0
|
1.30
|
0.0125
|
+4.0 to -4.5
|
1.40
|
0.0136
|
+4.5 to -5.0
|
1.50
|
0.0145
|
+5.0 to -5.5
|
1.55
|
0.0157
|
+5.5 to -6.0
|
1.60
|
0.0188
|
+6.0 to -6.5
|
1.70
|
0.0211
|
+6.5 to -7.0
|
1.80
|
0.0267
|
+7.0 to -7.5
|
1.90
|
0.0305
|
+7.5 to -8.0
|
2.00
|
0.0347
|
+8.0 to -8.5
|
2.10
|
0.0418
|
+8.5 to -9.0
|
2.20
|
0.0418
|
+9.0 to -9.5
|
2.30
|
0.0511
|
+9.5 to -10.0
|
2.40
|
0.0581
|
+10.0 to -10.5
|
2.50
|
0.0651
|
+10.5 to -11.0
|
2.60
|
0.0726
|
+11.0 to -11.5
|
2.70
|
0.0774
|
+11.5 to -12.0
|
2.80
|
0.0837
|
+12.0 to -12.5
|
2.90
|
0.0983
|
+12.5 to -13.0
|
3.00
|
0.1100
|
+13.0 to -13.5
|
3.10
|
0.1177
|
+13.5 to -14.0
|
3.20
|
0.1290
|
+14.0 to -14.5
|
3.30
|
0.1457
|
+14.5 to -15.0
|
3.40
|
0.1533
|
+15.0 to -15.5
|
3.50
|
0.1646
|
+15.5 to -16.0
|
3.60
|
0.1820
|
+16.0 to -16.5
|
3.70
|
0.1989
|
+16.5 to -17.0
|
3.80
|
0.2060
|
+17.0 to -17.5
|
3.90
|
0.2300
|
+17.5 to -18.0
|
4.00
|
0.2480
|
+18.0 to -18.5
|
4.10
|
0.2560
|
+18.5 to -19.0
|
4.20
|
0.2650
|
+19.0 to -19.5
|
4.30
|
0.3000
|