A 2.70 carat rectangular octagonal blue chalcedony with 0.11 carats of round white zircon in 18K yellow gold over sterling silver ring measuring approximately 0.51 inches - the blue chalcedony ring in warm gold. Chalcedony is a microcrystalline quartz with a distinctive translucent, waxy quality quite unlike faceted gemstones; its blue variety carries a soft, milky blue with a glowing internal quality. The rectangular octagonal cut gives the chalcedony a geometric form. Not sizeable.