Diamond retailers in the UK are failing to play their part in the battle against conflict diamonds and risk undermining the United Nations-backed initiative [Kimberly Process] to clean up the industry, according to a report to be released today...by Amnesty International and Global Witness...A majority of companies contacted replied in writing to the survey. However...11 failed to respond...Among them are Cartier [part of Richemont], Graff Diamonds and Fraser Hart. John Lewis and House of Fraser also failed to provide any information on their diamond policy..."[M]ost top-selling UK jewellers still lack adequate policies to effectively combat the trade in conflict diamonds", the report states...The UK report follows a survey of the $33bn US jewellery industry, conducted earlier this year, which revealed a similar pattern...[also refers to positive steps by Tiffany, Signet, Ernest Jones (part of Signet), H. Samuel (part of Signet), Leslie Davis (part of Signet)]