Sea blue and silver box clasp

When you look down on this clasp it looks like the ocean. The blue is deep and is accented by veins of silver. Because of the shading of blue the cabochon actually looks deep. This is a piece of vintage glass made in occupied Japan. The cabochon is set in a hand made sterling silver box clasp. The cabochon is 19 mm by 26 mm. The clasp is 38 mm from ring to ring.