The Blue Sapphire — D.E. Stevenson

Julia Harburn is engaged to the extremely proper Morland Beverly; and everyone expects them to marry and settle down. But an unexpected conversation with a handsome stranger on a London park bench has unforeseen results that alter the course of Julia's life.

Lovely young Julia Harburn wore a magnificent diamond that proclaimed her future as the wife of rich, socially prominent Morland Beverley.

But deep in Julia's heart was a doubt. Then she met handsome, daredevil adventurer Stephen Brett, just back from Africa with a headful of dreams and a thrilling story about a fabulous blue sapphire…