But colombia has yet more to offer : now and then the colombian emerald mines throw up rarities such as trapiche emeralds with their six rays emanating from the centre which resemble the spokes of a millwheel 极高的评价，甚至显而易见的内含物依然视为可接受。不仅如此，哥伦比亚还生产极稀有的祖母绿叫
