Is it permissible for the husband to sell the wedding (shabka) gold—which was not intended as a gift and was bought for the future and is not registered in the list—in order to fund a project?

The "shabka" (jewelry given by the groom) is considered part of the mahr (dowry) in some countries, like Egypt. It is a right of the wife, and the husband is not permitted to dispose of it without her consent. However, if the wife agrees to gift it to her husband or lend it to him, then there is no objection to him accepting it.