Hardness （硬度）= HV

Often referred to as "scratch resistance," hardness is measured using the Vickers Hardness scale. This tests the hardness of a metal by pushing a pointed object into the surface with a specified load and gauging penetration.

Durability （耐用性）= PSI

Tensile strength, or durability is measured in pounds per square inch.

Comparisons

18K Gold = 125 HV…29,000 PSI
Pt900/Ir = 110HV…55,000 PSI
Pt950/Ir = 80HV…40,000 PSI
Pt950/Ru = 130HV…66,000 PSI
Pt950/Co = 135HV…64,000 PSI