1 Exhibit 11 Marks Bros. Jewelers, Inc. Computation of Per Share Earnings Three Months Ended Six Months Ended ------------------------------- ------------------------------- July 31, 1997 July 31, 1996 July 31, 1997 July 31, 1996 ------------- ------------- ------------- ------------- (in thousands, except for per share amounts) Primary earnings per share: Income before extraordinary gain $ 1,760 $ 1,406 $ $2,300 $ 548 Extraordinary gain on extinguishment of debt, net of taxes --- 11,164 --- 11,164 ------------- ------------- ------------- ------------- Net Income $ 1,760 $ 12,570 $ 2,300 $ 11,712 ============= ============= ============= ============= Average shares outstanding 10,069 8,164 10,065 6,638 Common share equivalents under the 1995, 1996 and 1997 Option Plans assuming the treasury stock method 135 771 129 646 Additional shares assuming conversion of Class B shares 4 3 4 3 ------------- ------------- ------------- ------------- Average number of common shares and common share equivalents outstanding 10,208 8,938 10,198 7,287 ============= ============= ============= ============= Income before extraordinary gain per share $ 0.17 $ 0.16 $0.23 $ 0.08 Extraordinary gain on extinguishment of debt, net of taxes, per share --- 1.25 --- 1.53 ------------- ------------- ------------- ------------- Net Income $ 0.17 $ 1.41 $ 0.23 $ 1.61 ============= ============= ============= ============= 15 2 Exhibit 11 Marks Bros. Jewelers, Inc. Computation of Per Share Earnings Three Months Ended Six Months Ended ------------------------------- ------------------------------- July 31, 1997 July 31, 1996 July 31, 1997 July 31, 1996 ------------- ------------- ------------- ------------- (in thousands, except for per share amounts) Fully diluted earnings per share: Income before extraordinary gain $ 1,760 $ 1,406 $ 2,300 $ 548 Extraordinary gain on extinguishment of debt, net of taxes --- 11,164 --- 11,164 ------------- ------------- ------------- ------------- Net Income $ 1,760 $ 12,570 $ 2,300 $ 11,712 ============= ============= ============= ============= Average shares outstanding 10,069 8,164 10,065 6,638 Common share equivalents under the 1995, 1996 and 1997 Option Plans assuming the treasury stock method 149 771 148 680 Additional shares assuming conversion of Class B shares 4 3 4 3 ------------- ------------- ------------- ------------- Average number of common shares and common share equivalents outstanding 10,222 8,938 10,217 7,321 ============= ============= ============= ============= Income before extraordinary gain per share $ 0.17 $ 0.16 $ 0.23 $ 0.07 Extraordinary gain on extinguishment of debt, net of taxes, per share --- 1.25 --- 1.53 ------------- ------------- ------------- ------------- Net Income $ 0.17 $ 1.41 $ 0.23 $ 1.60 ============= ============= ============= ============= 16