Sales of platinum jewelry in the United States surged by 10%, while silver jewelry sales soared even more – up 15% - in 2015, JCK reported the two metals’ promotional groups as saying. Platinum jewelry sales rose around 10 percent in ounces last year, the third straight year that sales in volume have increased, according to Platinum Group International. The rise was triggered by the fall in the price of platinum. The precious metal’s price was 10% lower than the average price of gold. Meanwhile, the Silver Institute reported a 15% increase in silver jewelry sales in 2015 at U.S. retailers. Furthermore, 87% of retailers believe the increase in sales of silver jewelry will continue.