I consider acrylic the most durable since it is harder to break than glass.
I've heard that glass is harder to break than sapphire. I'm really not sure, but for that reason I've always liked it better than sapphire. It's by far the most expensive also.
Some watches have a glass crystal with a layer of sapphire on top.
Posted on Jan 1, 2002, 9:27 AM from IP address 64.12.105.31