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.
Titanium
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.
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From what I understand some jewelers stamped in the ring size!
The letters RSG stamped on a ring means that the ring was preassembled. Any gems in the ring that is stamped RSG have not been certified.
Most likely the ring is stamped with 925 instead of 525. This means that the ring is 92.5 percent silver.
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It is the initials of the ring makers name
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Japan
genuine