Bank transfer, West Union, Paypal , T/T, Trade Assurance , HSBC of HongKong
DHL, FEDEX, UBX, EMS,UPS
A+ :side line is uniform; color is uniform; high-low is uniform; but size will have 0.02mm deviation,this is normal;no eye visible from inclusion and crack, but in microscope have some ; good angle form line.
A :Color have some non uniform but still relatively uniform; good angle form line and uniform side line; eyes see have 10%around inclusion and crack.
A-: Color have severity non uniform, good angle form line,eyes see have 30%around inclusion and crack.
AB :Color non uniform,quality is bad,eyes see have more inclusion and crack.