No. Doesn't even remotely look like it.
..it's also not a necklace used in the film, and it's from 1992 when as this mine is from 1970. Same designer, that's about it.
I *think* this is the same ring though
http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW
..although my hallmarks look a bit different.