Woman unknowingly wore her engagement ring for over a year

An Australian woman named Anna unknowingly wore her engagement ring around her neck for over a year, thanks to her boyfriend Terry's crafty plan.
Terry explains on YouTube that he made Anna a necklace for their one year anniversary. Anna wore the necklace every day, but little did she know that there was something very special hidden inside the necklace. 
A year and half later, Terry and Anna visited Smoo cave in Scotland, a place they had always wanted to visit. Terry asked Anna to borrow