Helium Speed
HS 6.3
HS 8.6
0.04ct to 1.20ct
0.10ct to 2.5ct
(up to 6.3mm)
(up to 8.4mm)
Helium Rough
HR 1:1 D
HR 1:2 A
0.04ct to 8cts
0.90ct to 18cts
(up to 11.8mm)
(up to 16.8mm)
HR 1:2 D
(up to 23.6mm)
stone type
