Marie Mas - Marie Mas's unique jewellery is underpinned by intricate, moveable mechanisms. A fine example, this 18kt pink-gold double-band ring has a rotating top feature that turns to reveal a 0.25ct pink amethyst and a 0.29ct London-blue topaz on either side. A rotating outer ring adds further depth – note how one side is plain and the other is embellished with 25 pavé-set white diamonds, totalling 0.10ct. Delicate yet striking, this piece can be worn from day to night as part of any look.