OceanX Sharkmaster 1000 SMS1021M Zebra

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The OceanX Sharkmaster 1000 SMS1021M Zebra is a high quality watch. It pays tribute to diving watches of the present and the past, but does have key OceanX elements.
Under the hood you will find an automatic, Japanese SII NH35 movement. The glass is 4.5mm thick scratch resistant sapphire glass. The impressive 1000 meter water resistance of this watch is possible due to the helium valve, that you can see on the side of the case. The uni-directional 120 clicks bezel has a ceramic insert (which is very scratch resistant) and the characters have lume. The SMS1021M has a genuine Zebra Danio stone dial (which means every dial is different!) and is limited to just 299 pieces.
All these qualities ensure to the Sharkmaster is able to handle nearly any situation.

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What is the dial made from?