In an ultrabasic rocks in North Jiangsu, corundum was first discovered and some was up to gem grade.

苏北某地超基性岩中，首次发现了红刚玉，少量已达宝石级。

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There are a lot of other gem, jade, jadeite, fossil, chicken blood-stone, rocks and minerals and book, VCD, instrument about gemology. Welcome to look for you're favored.

本阁还有珠宝翠玉鸡血石及矿物标本教学VCD和书籍等，欢迎到店铺看看。

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