Norm-Entwurf
PR NF S89-004
; PR NF ISO 6893
PR NF S89-004
; PR NF ISO 6893
Jewellery and precious metals - Quality control of batches and sets of small diamonds - Terminology, classification and test methods
Titel (englisch)
Jewellery and precious metals - Quality control of batches and sets of small diamonds - Terminology, classification and test methods
