An extremely rare pearl necklace has fetched Rs 6.24 crore in an auction at Mumbai’s AstaGuru auction house on Tuesday. The necklace features graduated natural salt-water pearls in two different shades. According to the auction house website, the natural pearl weight is 2485.73 chau / 181 pcs while the weight of the diamond clasp is approximately 5.70/37 pcs. Besides this, …