Diamond Dark by Ellen Tanner March

Diamond Dark: The splendors of British India, a priceless diamond, and a love worth more than any fortune… The sizzling story of a Victorian beauty who travels from Cornwall to British India seeking a fortune, but instead finds intrigue and romance when her path crosses with a dashing sea captain who may not be what he seems. The fate of the priceless Kohinoor Diamond, now a fabled part of the British crown jewels, spicy romance, and a love worth more than any fortune make for a deliciously sexy read.