Prince Albert wasn’t allowed to propose to Queen Victoria because she was a reigning monarch. However, after Queen Victoria proposed to Prince Albert, he gave her an emerald and ruby engagement ring set in gold. What’s unique about this ring? It’s in the shape of a snake. It was quite the fashion in Queen Victoria’s day to wear serpent-like rings. Serpents were thought to represent love so it makes sense that Prince Albert commemorated their engagement with such a ring.
The engagement ring is buried with Queen Victoria, but you can find a similar style here.