It’s time for a new detective story trope! The Hardboiled Detective. They’re a feature of American detective stories in the 1930s and 1940s. They’re tough, cynical, unsentimental, street smart antiheroes—no fancy ‘Sherlock Holmes’ types here.
The line in this passage about the gold ring is a typical ‘hardboiled’ observation. To this sort of person, a gold ring that large is a pointless trinket. It’s something that shows the client to be a show off with a lot of money, or someone who thinks they’re important. Hardboiled types don’t care much for people driven by money or power.
How ‘hardboiled’ you make your narrator is up to you.