I made a paper mock up model to figure out the size of the ring and its construction method. 
The top part of the ring is slightly raised from the base plate so that the ring can function as a signet.
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I created a hollow constructed ring, which also functions as a signet ring that can leave my signature.
I used various metals including cooper, brass, bronze and silver. Each metal pieces were cut by hand, using the jeweler saw. Then the cut pieces were soldered and carefully put together.

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Sein Woo
Interaction Designer at Sonos, Inc Providence, RI