A mechanical Marvel, the block does the work for you.
All parts are completely examinable before and after the illusion.
A bracelet is lowered into a slot cut into a solid block of wood. A steel hat pin is inserted in a hole through the block preventing the bracelet from being removed. The spectator can even pull on the bracelet to see it is secured. After the bracelet is in place the magician may set it upon a spectator's palm for a moment and then lift the bracelet away from the block and all may be examined! The workmanship and mechanism are perfect in this solid wooden block.
Bracelet, hat pin, and block supplied, but any pin or bracelet can be used.