Diamond: 4C

Just now while I glance through my old Europe photos, I came across this picture which we took at a diamond cutting factory in Amsterdam, Netherland. It mentioned the 4C of diamond, I think it's good for you to refer to when you want to buy diamond.   ;)

Carat  1 carat is 0.2 gram
Color  Please refer to the pircute, the nicest color is river where yellow is the lowest grade
Clarity  from Perfect to pique 3
Cut  please refer to the picture as I forgot what did the person told us since it was 7 years back lol