Diamond trading seasonally quiet, but diamantaires in positive mood as they return from New Year break. Dealers waiting for memo sale results to assess holiday season. Concern that US economic growth will slow in 2020 election year. Optimism for mainland China during Jan. 25 lunar festival. Hong Kong retail sluggish. Manufacturers cautious about raising factory production, despite expected 1Q inventory replenishment. Polished prices stable, with improvement in 0.30 to 0.50 ct., D-H, IF-VS diamonds due to Chinese holiday demand and shortages of RapSpec A3+ goods. Prices and demand weak for 3 ct. and larger, F+, VVS+ diamonds. Rapaport hosts trade mission to Surat, India.