Diamond expert handles ?50 , 000 of flawless gems . Diamonds to the value of ?50 , 000 are often on the table of Mr A Monnickendam , a Hatton Garden , London , diamond diamond merchant . Mr Monnickendam specialises in flawless stones . He handles them in the uncut state and is one of the few craftsmen of his kind outside Amsterdam . Mr A Monnickendam examining a Marquise diamond worth ?2 , 000 in his Hatoon Garden office . The stones on his desk are worth ?50 , 000 . 7 March 1933