MC is multicolore, it looks like Skittles:
And the mono is Monogram, which looks like dark and milk chocolate.
Thanks LVbabydoll! Now I see what Bagaddict was pertaining to. Pardon my being naive on the terms. That is very pretty! That was my first attraction till I saw the Mono! But still debating. Glad to hear the durability...how often do you guys wear or use this and how long have you had it? Is it brass or gold plated?