Gold prices broke above their key 50-day moving average, marking a very bullish development as the U.S. dollar nose-dived and the major stock indexes cheered Black Friday. The spot gold price jumped 1.21% to $1,751.70 an ounce. SPDR Gold Shares (GLD), tracking a 10th of an ounce of bullion, surged 1.21% to 169.58 in heavy volume. GLD regained its 50-day line for the first time since it broke below it a month ago, confirming that its uptrend