I have an old c-clasp brooch that I cannot identify the stone in...I tried to capture the essence of the stone but photo nor scan does so...it appears to be a milky white stone until it is rotated under light then the myraid of color burst from the bottom in a range of pinks, oranges and blues...the stone has a carving on it which is also hard to detect...I think the metal base is silver but it has no markings...any help would be welcomed...

