Soft chalcedony swirl clasp

The color of this clasp almost defies description. It is a very soft blue, but it is almost white. It could certainly be used with chalcedony, or white beads, or pearls. It is a glass swirl made in occupied Japan. Because of the multi-layers of glass used to make the piece, it has a certain luminescence which is why I think it could be used with the right pearls. The vintage button is set into a sterling silver box clasp. The centerpiece is 18 mm in diameter. The clasp is 30 mm from ring to ring.