Special grade product: vert, yellow-green, with some cracks and impurities, translucide, and the weight is above 50kg. First-class product: bleu vert, light green, yellow-green, with some cracks and impurities, translucide, and the weight is more than 10kg. Second grade product: bleu vert, light green, no cracks, a little impurity, and a block weight above 5 kg. Troisième […]
