Butterfly Ring 3-D Margaret Thurman ? Amethyst Coral Swarovski Crystal Vintage

Well it's been on my desk for awhile - guessing it's Margaret Thurman - there is a small designer logo on one side of the outside ring. I tried to capture it but couldn't get a clear picture. IT's very 3-d in nature - I believe it's bronze - there's an array of minerals pave set throughout the top with detailed butterfly's either side. It's a size 8 in mint condition and I have no clue how old it is. Only one I have.