he grading and evaluation standards of rubies are mainly based on 1T and 4C: 투명도, Colour, 명쾌함, 자르다, and Carat. 1. 투명도: refers to the degree to which a gemstone allows visible light to pass through. In the visual identification of rubies, transparency is generally divided into five levels: 투명한, translucent, translucent, sub-translucent, and opaque. […]
