The MMM that you are seeing etched on the inside of the ring is the designer who designed that specific piece or jewelry line. The most common designer that uses MMM is Maison Martin Margiela.
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Marks stamped on a ring may tell you the manufacturer as well as the composition and metal quality.
It is the silver content in the ring. 988 is 98.8% silver.
Plated with 10kt gold
It's probably someones initials.