Special grade product: vert, jaune-vert, with some cracks and impurities, translucide, and the weight is above 50kg. First-class product: bleu vert, vert clair, jaune-vert, with some cracks and impurities, translucide, and the weight is more than 10kg. Second grade product: bleu vert, vert clair, pas de fissures, a little impurity, and a block weight above 5 kg. Troisième […]
