FOILING 水銀底
Foiling is the process of mirror coating jewellery stones to obtain optimum brilliance 水銀底是指在水晶首飾石底部進行的鏡面塗層工序，使水晶石達致
最完美的閃爍效果。
F = FOILED：A silver mirror coated with a newly developed, F = 白金水銀底︰銀色鏡面塗層加上新開發的白金色保護層。
platinum - colored, protective layer.
M = M-FOILED：An aluminium mirror, applied using a vacuum M = 鋁質水銀底︰利用真空塗層工序塗上的鋁質鏡面。
coating process.
U = UNFOILED：No any mirror coat. U = 無水銀底︰水晶石背面並無任何鏡面或塗層。
