These glittery smoky quartz center stone earrings made an appearance at the 100 Women in Hedge Funds (October 2011).
They are quite large pendants. They look to be a large oval or round smoky quartz set in a large gold setting. The surface of the gold setting and the earring post is textured and stony in appearance.
I believe (as do others) that this is most likely costume jewelry.
Here they are on Kate. She is wearing a beautiful Beulah dress.