3 words... DONT DO IT!
Just been caught out myself and don't want it happening to anyone else. Was guaranteed the bracelet was a 2nd hand 100% genuine, fully hallmarked links of london sweetie bracelet from The links shop at Lakeside. As soon as i opened the box i knew it wasn't right. Took it to swag jewellers in staines and they confirmed my thoughts, they said it was a very good copy, even had a fake hallmark! I then took it to another jewellers where i once worked and got my old boss to acid test it for me to see what material it was and it wasn't even silver!
My best advice for anyone wanting a sweetie bracelet is not togetone from ebay, even if they have a receipt. People will go great lengths to con you!
Save up and buy one from a reputable dealer! The extra pounds spent are worth it as its been a complete waste of time for me buying one from ebay!