“Men grow cold as girls grow old and we all lose our charms in the end. But square-cut or pear-shaped these rocks don’t lose their shape. Diamonds are a girls’ best friend.” So sang a girl who knew what she was talking about…none other than Marilyn Monroe. And indeed diamonds always have been and probably always will be luxury product Number 1. A good starting point are the chandelier earrings from India’s highest quality jewellery manufacturer Gem Palace which check in at €20,770. For a more long term investment why not opt for a giant oval diamond from Tiffany & Co which is ringed by smaller stones for €1.7m or as a slightly cheaper alternative there’s a stunning cushion-cut diamond for €783,000. Something which even Marilyn Monroe would not have dared to dream of is provided by jewellers Graff; namely the Lethoso Promise Necklace which is a product of three months of studies culminating in the careful cut of the famous Lesotho diamond which was rated as the 15th biggest diamond ever discovered. Price: a cool €50m.