My apologies as I have been out this weekend. I really am unsure as there are no markings on this at all. I can tell you that the last one I sold was indeed real, but it had the 925 stamp on it. This one does not have the stamp, but it also isn't made like junk (there are no backings on the gems so you can see through to the other side) most junk will be covered on the back. I'm sorry but I just didn't get it appraised.
According to Diamond Bug, in 1987 Chris Evert, the former World No. 1 woman tennis player and the winner of 18 Grand Slam singles titles, was playing in the U.S. Open. She was wearing an elegant, light in-line diamond bracelet, which accidentally broke and the match was interrupted to allow Chris to recover her precious diamonds. The 'tennis bracelet' incident sparked a new name for the item and sparked a huge jewelry trend.