Las Vegas show opens with hopes it will uplift diamond market. Jewelers taking more on memo and using tech in their stores to tap online supply and improve consumer buying experience. Polished suppliers left with large volumes and low profit margins. Rough market slow. India’s customs unreasonably tightens disclosure rules for rough imports. India April polished exports -18% to $1.6B, rough imports -5% to $1.4B. Christie’s Hong Kong sells $45M (77% by lot) with cushion, 3.43 ct., fancy-vivid-purplish-pink, IF diamond fetching $7.5M ($2.2M/ct.). Rapaport to host annual Las Vegas conference on Sunday, June 2, at 8 a.m.