Originally posted by: Don_Vito
Originally posted by: Mwilding
what is the difference between sapphlex and hardlex?
Hardlex is mineral crystal, which is not one of the world's great crystal materials IMO. It is tough, but can be scratched, and is nonrepairable. Seiko actually uses it on their VERY expensive Marine Master diver because it is less prone to shattering than the more scratch-resistant (and IMO clearly superior) sapphire. Most other premier dive watch makers, including Rolex, IWC, Omega, etc. use sapphire. Sapphire is essentially unscratchable, but can be chipped or shattered under truly extreme abuse. I still think it is the best crystal material, with acrylic (basically plastic) my second favorite. Acrylic is quite tough and glare-resistant. It scratches easily, but scratches can easily be buffed out.
On the bright side, Hardlex is fairly scratch-resistant with a little care, and cheap to replace.
Sapphlex is a Seiko creation. It is basically a Hardlex crystal with a sapphire layer bonded to the top for scratch resistance.
As I said before, Yao makes a nice domed sapphire crystal for the SKX007, when and if the original crystal gets toasted.