Special grade product: 緑, yellow-green, with some cracks and impurities, translucent, and the weight is above 50kg. First-class product: アクアマリン, light green, yellow-green, with some cracks and impurities, translucent, and the weight is more than 10kg. Second grade product: アクアマリン, light green, no cracks, a little impurity, and a block weight above 5 kg. Third […]
