These yellow gold earrings by Biiju feature a pair of unusually faceted smoky quartz gemstones. The gemstones, which have been bezel set to allow them to sparkle and be fully visible from both sides, are detachable. They can also be fixed to other jewellery designs within the Biiju collection. Similarly, other gemstone pendants can be bought and attached to the gold earring hooks, allowing for a quick update. Biiju is a fully customisable jewellery brand created by designer Joanna Boyen, which allows shoppers to personalise jewellery designs with gemstones of their choice.