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Ceramic material is commonly used in watch making. Seiko has used it to make bracelet, bezel insert and the shrouded case of the 1000m professional diver.
I am not too very sure about the characteristics of ceramic. I believe it is pretty scratch resistant, light and probably quite brittle.
Here I have a ceramic ring. I am wearing it and I will soon know how it well holds out against scratches. Let’s see if it chips or cracks easily as well.
I will post an update on this in a few weeks.