(Reuters) - Fossil Group Inc's shares plunged 20 percent to an eight-year low on Wednesday after the watchmaker's grim full-year forecast indicated that the company's push into smartwatch business would weigh on its margins.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=z20_lfiU-x0:M6rxOTbm-2A:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=z20_lfiU-x0:M6rxOTbm-2A:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=z20_lfiU-x0:M6rxOTbm-2A:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=z20_lfiU-x0:M6rxOTbm-2A:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=z20_lfiU-x0:M6rxOTbm-2A:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/z20_lfiU-x0" height="1" width="1" alt="" />