A Presence in The Jewelers Building For Over Two Decades, Boston Bijoux Specializes In Custom Designs Established in 1988, Boston Bijoux, located in the Jewelers Exchange Building (333 Washington St.) in Downtown Crossing, offers all types of jewelery. Boston Bijoux carries metals–including 14k and 18k–in white, yellow, and rose. It also stocks a wide variety of platinum, from engagement rings and wedding bands to pearls and colored gemstone-based jewelry. A majority of the inventory is made in the right store workshop, and custom designing is also a major feature of Boston Bijoux.