A platinum diamond ring

A platinum diamond ring, a transitional cut diamond, estimated as approximately 0.54ct, claw set to a rex collet, to tapering chenier shoulders grain set with eight cut diamonds, and a plain polished shank, marked PT, 3.08g.
Finger size Q¾
Sold for £380

Condition report:
Some wear to claws, one missing.
Dirt to underneath of diamond, would benefit from being cleaned.
Surface marks/scratches to mount.
Shank slightly thinner at base.
Sizing join visible at base of shank.