They are a dangle style with two diamond shapes, one with a genuine black onyx cabachon in the center, the other has a faux white pearl. Those are surrounded by marcasite stones. They have a link in between giving them movement when wearing so that the light can reflect off of the maracasite and give a brilliant look of diamonds.
They measure 1 1/2" in length and 1/2" in width; with a post and clutch back.
In Never Been Worn, Mint Condition.
These are on the more elegant, dressy side and would be gorgeous with a black dress.