Oʹpal

From the Greek ops (the eye). Considered unlucky for the same reason that peacocksʹ feathers in a house are said to be unlucky. A peacock’s feather, being full of eyes, act as spies in a house, prying into one’s privacy. Similarly, it is unlucky to introduce the eye-stone or opal into a house, because it will interfere with the sanctity of domestic privacy. (See Ceraunium).