EOSC 118 : Lesson11.docx
Document Summary
Cut and polished diamonds are evaluated by four primary variables, all beginning with the letter. What are the 4 cs for evaluating polished diamonds: colour, clarity, cut, carat. All variable are equally important and it is their unique combination that defines the value of a diamond. Who introduced the 4 c system: de beers in the late 1930s, since then, the 4 c system has become standardized and has gained widespread use by gemological libraries like gia, egl, and jewelers and consumers. Variations on the 4 cs have been used for other gemstones as well, but not to the same extent as with diamonds. The image and video link below are about a wonderful faceted gemstone, which it is not a diamond. The mineral is called cerussite and is a lead carbonate with particularly high average refractive index and dispersion.
