I inherited an oval blue


I inherited an oval blue sapphire from my grandmother who received as a gift from grandfather sometime between 1935 and 1954. It’s a rich blue color, about 2+carats with six small diamonds flanking (3 each side), set in 14k white gold. From what I know, grandfather was a jeweler for some time during that period in Philadelphia, located in Jewlers row.

I don’t know if it is a natural stone and my question is, were lab created stones prevalent back then? The stone is very brilliant blue and seems to be very well cut. Any insight would be appreciated.