Hi Halia thank you for writing in. Congratulations on your wedding and choosing a beautiful antique ring that doesn't cost the environment. The sapphire ring looks beautiful on your wedding ring finger by the way.
18 ct gold mean it's a quality piece. Lady Diana Spencer also preferred sapphires. When she accepted the engagement proposal, a selection of engagement rings was presented for her consideration by Garrard Jewellers. From a list of gemstones, Diana choose an 18 ct gold oval blue sapphire engagement ring surrounded by diamonds. You can see the ring here.
I'm curious to know if the reason you are having trouble reading the first letter is due to the fact that the letter has worn away, or is it due to the stylized form of the letter which can often be quite confusing?
About the maker's marks, there are a number of possibilities, we would need to see an image of the marks to provide an opinion.
