South African stocks rose during the year's first trading session on Friday, boosted by strong industrial metals, while firmer global markets also helped lift the rand.The blue-chip Top-40 index climbed 1.23 percent to 19,683.94 points while the broader All-Share index gained 1.19 percent to 21,764.90 points in the first session of 2009.But volumes were thin with few investors at work following the Jan. 1 holiday and ahead of the weekend.