Cartier 1930 ruby and diamond necklace for sale at SJ Phillips, seen at TEFAF 2017

One of the highlights of TEFAF 2017 is this 1930s ruby and diamond panel necklace by Cartier New York. Art Deco in style with a strong symmetry and geometric rigour, the necklace is cleverly articulated to move with ease. For sale by SJ Phillips of London (£4.2 million).

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