A little magic, some swashbuckling and a ball
I stumbled across this young adult gem as a read-alike to Georgette Heyer and Jane Austen. A smart, exciting mix of Regency and fantasy, "Newt" refers to Lady Truthful Newington and her "emerald" is a magical heirloom stolen during a family party on her eighteenth birthday. The precious stone's properties are properly harnessed only by the owning family which puts the Newington's in peril of misfortune and possibly worse if the jewel gets into the wrong hands.