Jia Jia - Jia-Jia Zhu unites precious stones and their properties with the elegance and grace of simple jewellery design for her eponymous label, including this 14kt gold Arizona Rainbow necklace. It's handcrafted in New York with a rainbow selection of faceted sapphires - stones that connect to all seven chakras - to create an enchanting ombré pattern, then finished with a lobster clasp fastening.