Diamond market optimistic, but polished prices continue to soften. 1 ct. RAPI -0.9% in Nov. due to weak demand for D-F, IF-VVS goods. Holiday season driving positive sentiment, with strong growth in purchases via mobile devices. Retailers creating selfie events and experiences to lure customers away from laptops and into stores. Sotheby’s NY garners $53.9M (82% by lot), with sale of emerald-cut, 5.69 ct., fancy vivid blue, VVS diamond for $15.1M ($2.7M/ct.). Christie’s NY fetches $62.6M as Graff ring with two pear-shape, fancy vivid blue diamonds – 3.36 ct., VVS2 and 2.71 ct., VS1 – sells for $12.6M ($2.1M/ct.). Graff buys Sierra Leone Peace Diamond for $6.5M.