Green gold ingot is a crafting component introduced in the Blood and Wine expansion that can be dismantled into green gold ore. It is only needed to craft green gold plates, and can also be dismantled from them.
Crafting Requirements 
It can be purchased from the following merchants:
- Armorer in Hauteville
- Blacksmith in Belgaard Manor, after he is rescued
- Lazare Lafargue in his workshop
- Trentin in his workshop in Hauteville