he grading and evaluation standards of rubies are mainly based on 1T and 4C: Transparansi, Warna, Kejelasan, Memotong, and Carat. 1. Transparansi: 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: transparan, tembus cahaya, tembus cahaya, sub-transparan, and opaque. […]
