RAPAPORT... The number of active US jewelry companies continued to decline in the second quarter, according to the latest data from the Jewelers Board of Trade (JBT).Some 161 businesses shuttered during the three months ending June 30, compared with 143 in the same period a year earlier, the JBT said last week. In total there were 23,796 companies active in the US industry, a drop of 1.8% compared...