The blue topaz inset contrasts beautifully with the green malachite in this ring by American jewellery designer Kara Ross. Diamond accents in each corner of the faceted malachite further emphasise the volume and geometric shape of the stones. With a name that means “sunken” in Latin, the Cava collection showcases Kara’s inset technique of layering one stone within another. After training as a gemmologist at the GIA, she established her eponymous jewellery brand in 2003 and has won several awards for her designs, including the 2014 GEM Award for Design. Based in New York City, Kara opened her first flagship store on Madison Avenue in 2013.