I've done a bit of digging into the question about engagement rings. Here's something from 1873. Apparently the right hand thing would be an American tradition and not necessarily British.
"The proposition being made and accepted, a ring, called 'the engagement ring,' usually containing a single diamond, of the highest value to which the generosity and means of the giver are capable of attaining, is presented by
the successful suitor to his betrothed, who wears it ostentatiously on the ring-finger of her right hand."
from: "The Bazar Book of Decorum.
The care of the Person, Manners, Etiquette, and Ceremonials." 1873
Cheers,
China