Like a gemstone? No, it's a magic prop!...PREMIUM METAL Series.
It is Set of "PM SHOCKING KEY"(M7141) and "PM IMPOSSIBLE KEY & RING"(M7145).
"PM SHOCKING KEY is a powerful visual trick, but you cannot hand the key to the spectator before the protrusion moves. On the other hand, the "PM IMPOSSIBLE KEY & RING" lacks such a dramatic visual effect but allows you to hand the key over to the spectator both before and after the performance. By combining these two tricks, you can fully leverage the strengths of each.

Although both keys appear identical in shape and size (90mm in length), they actually differ in material due to the nature of the respective tricks. The designs and blueprints have been refined multiple times by the product designer, making this one of the finest creations in the "PREMIUM METAL" series.