18k gold ring with blue sapphire, initials engraved

I lost my 18k yellow gold ring with a deep blue sapphire yesterday around 3pm near Covent Garden Piazza, in London, outside the Royal Opera House. It's a handmade piece from Mira & Co., about 3mm wide, with a delicate milgrain edge and an inner-band engraving of the initials 'A.P.' The sapphire is a vivid royal blue, and there's a tiny, barely visible scratch along the bezel from wear. This ring means a lot to me—it was a gift from my grandmother and carries sentimental value. If anyone found it, I’d really appreciate getting it back.