1) the colour test -look at the edge of the crystal.A sapphire crystal will have a pinkish hue,a mineral crystal will have a greenish hue.颜色：蓝宝石玻璃发粉色，矿物质玻璃发绿色

 

2) the water test -place large drops of water on the crystal,then tilt the watch and watch the water slide off.On the sapphire crystal,water will easily slide off -leaving small well-formed round globules of water on the surface.On the mineral crystal -most of the water will"stick"to the crystal and the drops of water will spreadacross the surface of the crystal to form a non-uniform"puddle"instead of sliding off.水测法：放一大滴水在表镜上，倾斜让水流下。蓝宝石玻璃上的水流的很快，水滴不变型，无残留。矿物质玻璃上的水滴发“粘”，留在表镜上的水没"型"。

 

Try both tests on watches you know have sapphire crystals or mineral crystals and the results will become immediately apparent to you.Test number 1 doesn't always work if the edge of the crystal is not a clear polished finish(instead an opaque powder finish) -and can be confusing before a comparison test is performed.2种方法都试验一下，因为第1种不是很灵，表镜的边缘有时被抛光，打毛处理过。 
更多标签：机械表自动停走原因 机械表快慢针问题 机械表内部机芯结构怎么样 机械表常见故障分析