The earliest GIA program materials during the Richard T. Liddicoat Gemological Library and data Heart that mention the 4Cs are from 1949. Diamond color, clarity, Slash and carat pounds are collectively termed the “4Cs” – the things that, when merged, outline a diamond’s quality and finally identify its worth. Just https://www.gemsbiz.com/blog/explore/a-guide-on-diamond-quality-grading-parameters