 Constance P. Mellon’s Kashmir sapphire and diamond necklace is estimated to $2.5m. | The women at the center are Constance Prosser Mellon and her daughter, Constance Barber Mellon, who went by Connie. Eleven jewels that belonged to them will headline the Sotheby's Magnificent Jewels sale in New York next month. Connie died in 1983 at age 41. |  |
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