This is a pair of opal earrings set in 14k gold.  It is marked, but unable to get a clear picture (very hard to read).  I also tested it, A tiny diamond  to the upper right ( I did not test this).  Measures 1/2" in length and the opal is 1/4".  The backing is not the original so they are not gold.  Very disappointed the pictures don't show how full of color and fire these are.   Very beautiful and you won't be disappointed.  I take returns, but these are a keeper.  Many thanks for looking.