Many genuine watches use a crystal (the glass face of the watch) made from a large piece of synthetic sapphire. Sapphire is highly resistant to scratches and chips. It's a perfect material for watch crystals and see-through case backs. Sapphire crystals are nearly transparent at any angle. They have very little distortion unless their thickness is greater than average (like on a Panerai PAM-127 1950 replica).

All Rolex watches use a sapphire crystal. Rolex watches also tend to have a small crown engraved at the 6 o'clock position that isn't emulated on replicas with mineral glass crystals.

Some less expensive replicas substitute a crystal made out of treated glass (called "Mineral Glass") for the more expensive sapphire crystal. This means the watch costs less to produce, but the crystal is susceptible to scratches, chips, and other flaws. Mineral glass crystals tend to have a greenish cast to them. They will also distort the dial when viewed at an angle.

How do you detect a sapphire or mineral glass crystal? Water tends to bead on a sapphire crystal while it will slide off a mineral glass crystal. Also a sapphire crystal won't scratch when you drag a razor across its surface. When in doubt visit your local watch repair shop. They can aid you in determining whether the crystal on your watch is glass or sapphire.

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