Floyd Mayweather Jr. was spotted on a shopping spree looking for diamonds this week … hitting up 3 different NYC jewelry stores in 2 days … and dropping more than $500k at one of the shops.

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Floyd bought one ring, multiple watches and a pimped out bracelet. We’re told he dropped around $500k.

Floyd also met with Jacob the Jeweler on Wednesday where he checked out two more watches — though it’s unclear if brought something or not.