F & F Felger Jewelry Company was an East coast jewelry design house. Known for their fine craftsmanship, they supplied jewelry to companies such as Tiffany & Co. and Cartier from the 1920s all the way through to the mid-century.
Ostby & Barton was a historic fine jewelry firm founded in 1879 by Engelhart Ostby and Nathan B. Barton. Finding renown as “the largest ring manufacturers in the world,”