<DOCUMENT>
<TYPE>EX-4
<SEQUENCE>6
<FILENAME>ex4_080902.txt
<DESCRIPTION>JOINT FILING AGREEMENT
<TEXT>

                                                                       Exhibit 4


CUSIP No.  578462103


                        AGREEMENT CONCERNING JOINT FILING
                                 OF SCHEDULE 13D

                  The undersigned agree as follows:

                  (i) each of them is individually eligible to use the Schedule
13D to which this Exhibit is attached, and such Schedule 13D is filed on behalf
of each of them; and

                  (ii) each of them is responsible for the timely filing of such
Schedule 13D and any amendments thereto, and for the completeness and accuracy
of the information concerning such person contained therein; but none of them is
responsible for the completeness or accuracy of the information concerning the
other person making the filing, unless such person knows of has reason to
believe that such information is inaccurate.

                  This Agreement may be executed in any number of counterparts,
each of which shall be deemed to be an original, but all of which, taken
together, shall constitute one and the same instrument.

                  Dated:  August 9, 2002

<PAGE>

                                          HENRY BIRKS & SONS INC.

                                          By:  /s/ Sabine Bruckert
                                               ---------------------------------
                                               Name:  Sabine Bruckert
                                               Title: General Counsel and
                                                      Corporate Secretary


                                          HENRY BIRKS & SONS HOLDINGS INC.

                                          By:  /s/ Marc Cantin
                                               ---------------------------------
                                               Name:  Marc Cantin
                                               Title: Director and
                                                      Corporate Secretary


                                           REGALUXE INVESTMENT Sarl.

                                          By:  /s/ Gerald Berclaz
                                               ---------------------------------
                                               Name:  Gerald Berclaz
                                               Title:   Director


                                          DR. LORENZO ROSSI DI MONTELERA

                                               /s/ Lorenzo Rossi di Montelera
                                               ---------------------------------


</TEXT>
</DOCUMENT>
