The Swyndon Necklace — Mira Stables

She only knew that she was his to command; that her body thrilled to his lightest touch, her heart leapt at his smile; and that he was not for her.

Honor Fenton was lovely, but penniless. There seemed to be little in her future but spinsterhood. Then one day she received an unexpected legacy--the fabulous Swynden necklace.

Not long after this she was rescued from an unpleasant street incident by a dashing young stranger. When Honor learned that the stranger, Mr. Jocelyn, was the agent of a certain Marquess who wanted to purchase the necklace she was very disturbed.

She did not know quite what to make of the mysterious Mr. Jocelyn. At first she was furious. Partly because she was attracted to him--and partly because she felt he was only interested in the jewels.
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UK CORGI Edition

A diamond necklace and a season in fashionable Bath! For penniless Honor Fenton, this legacy could lead to a splendid marriage - or so Mama declared. And indeed, Honor's beauty made her the toast of Bath, but she was sadly unworldly - a defect which led her into some rather unladylike scrapes, from which she always seem to be rescued by the handsome Mr Jocelyn, a stranger whose tender concern belied his imperious manner. Though his apparent lack of family and fortune could hardly endear him to Mama, Honor fell deeply in love, and vowed to marry no other... Unfortunately, Mama had already made her choice - the wealthy and eligible Sir Ralph Rampton...