Special grade product: zelený, žlutozelená, with some cracks and impurities, průsvitný, and the weight is above 50kg. First-class product: akvamarín, světle zelená, žlutozelená, with some cracks and impurities, průsvitný, and the weight is more than 10kg. Second grade product: akvamarín, světle zelená, žádné praskliny, a little impurity, and a block weight above 5 kg. Třetí […]
