This statement necklace features a 417 carat sky blue Chalcedony Gemstone. Chalcedony is a quartz of the silica family that is somewhat rare and has a waxy luster. This necklace is popularly worn during the spring and summer months due to its bright color. The Chalcedony holds a special place in the Bible, as it is the third foundational stone of the New Jerusalem, according to Revelation 21:19. The Greek word "Chalkedon" in the Bible translates to "precious stone." 18" adjustable with a toggle clasp.