Platinum Prodigy is a Merchant NPC.
She can upgrade your Platinum weapon.
|Level 40 to 45 Upgrade||1-Carat Red Diamond|
|Level 45 to 50 Upgrade||1-Carat Red Diamond x 2|
There may also be an added effect to the Platinum weapon as it is upgraded. Gold stats will remain on the weapon when upgrading, unlike normal weapons. Also be aware that slots will be lost when the slotted weapon is upgraded. There is a very slight risk of the upgrade failing.