Oval Blue Chalcedony cabochon earrings

Blue chalcdony oval cabochons set by hand in 14k yellow gold.
A member of the quartz family, silicate minerals in the Chalcedony family come in various colors, the clear pale blue is one of the more rare varieties. 
Blue chalcedony has been mined since 2500 BC and is named after the ancient sea port of Chalcedon or Kadikoy.