Argos unveils stunning 1.00 CT diamond cluster engagement ring   London, 2017-Aug-21 — /EPR Retail News/ — As style icon Millie Mackintosh reveals her breathtaking engagement ring to the world, leading digital retailer, Argos has released an almost identical version, for a fraction of the price. The stunning 1.00 CT diamond cluster ring, set in luxurious yellow 9…