A.1ct=0.10g B.1ct=0.15g C.1ct=0.2g D.1ct=0.25g
A.6.5mm、9mm B.6.0mm、9mm C.6.5mm、3.5mm D.6.0mm、5mm
A.0.990ct B.0.995ct C.0.998ct D.0.999ct