东京工业品交易所白银期货主力合约收报63日圆/克，较上一交易日下跌0.3圆/克。   
以下是TOCOM 4月21日白银期货行情:                                            
合约      昨收    开盘    最高    最低    收盘    涨跌   成交量             
17/04月   63      -       -       -       -       0       -                 
17/06月   63.2    62.9    62.9    62.9    62.9    -0.3    1                 
17/08月   64.2    -       -       -       -       0       -                 
17/10月   64.2    -       -       -       -       0       -                 
17/12月   63.5    63.3    63.3    63.3    63.3    -0.2    1                 
18/02月   63.3    63.2    64.1    62.9    63      -0.3    55                
合计                                                      57                
注:1.单位:日圆/克；成交量单位:手。                                          
2.最小价格变动单位日圆/克。