The court heard that in several of the attacks one of the gang gained entry to the targeted shops purporting to be a customer. He then held the door open for his hammer and axe wielding accomplices who proceeded to smash the display cabinets and fill their bags with jewellery.
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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.