A judge has told notorious bank robber Sean Bradish he will serve a minimum of eight and a half years but given deceit in the past, it is impossible to say when he will get parole.
Bradish would point a handgun at customers and staff, threatening to shoot them before escaping with their cash.
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The entertainer was held for the murder of Stuart Lubbock, who was found dead in his swimming pool in 2001, but never charged.
Although the diamond was believed to be cut in the 19th Century, its history and how it arrived at the car boot sale is unknown.
The former entertainer, who was released from prison on Friday, is accused of indecently assaulting three women in the 70s and 80s.