Top Hat - A flat vintage top hat style design.Bubble Dome – A high double domed bubble like design.Double Dome – Domed top and underside surfaces.Single Dome – Domed top surface flat underside.Rolex Omega AP Panerai Bremont Hublot GP Cartier).Ĭrystaltimes produces 5 designs of sapphire crystal: Premium watches generally use sapphire crystal (e.g. The most common types of watch glass, or crystal, used to protect the face of a watch are Sapphire Crystal, Mineral Crystal, and Acrylic.
It is extremely hard (Moh’s scale 9 – Diamond is 10), and will resist scratching by most substances short of diamonds. Mineral crystals are also somewhat better at shatter resistance compared with sapphire.Ī sapphire crystal is made of synthetic sapphire, which is a transparent form of corundum, or aluminum oxide (Al2O3). Fortunately, scratches can be easily removed from acrylic.Ī mineral glass watch crystal is hardened glass (Seiko name – Hardlex), which is much more scratch resistant than acrylic, but significantly less than sapphire. An acrylic watch crystal is hardened plastic, which has the advantage of being resistant to shattering, but can be scratched fairly easily.
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