Drake Buys Heart-Shaped Diamond Ring For His Birthday

Drake is showering himself with expensive gifts for his 33rd birthday ... dropping more than half a million dollars for a custom diamond ring in the shape of a heart.

Sources with knowledge tell TMZ ... the "Hotline Bling" rapper purchased a 22-carat, heart-shaped diamond ring from Gemma Fine Jewelry as a bday present to himself, and the piece is valued between $600,000 and $800,000.

As you can see, the diamonds are mounted in a platinum setting ... it's extremely difficult to make a heart-shaped ring of this size -- making this a very rare find.