Lot 226, a coloured diamond and diamond ring by JAR, set with an oval-cut fancy intense yellow diamond weighing approximately 15.75ct, mounted in platinum (estimate: US$500-700,000)

Lot 226, a coloured diamond and diamond ring by JAR, set with an oval-cut fancy intense yellow diamond weighing approximately 15.75ct, mounted in platinum (estimate: US$500-700,000).