Material
Emerald
祖母绿是很古老的宝石品种之一最优质的祖母绿是可以比钻石还更有价值。在古埃及时代就已用做珠宝。当时的著名矿场－克利奥帕特拉，现已因大量开采而耗竭。
Emerald is one of the most ancient gemstone varieties. The highest quality emeralds can be more valuable than diamonds. It has been used as jewelry in ancient Egypt. The famous mine at that time, Cleopatra , has been exhausted due to extensive mining.