Systems, methods, and computer-readable media are disclosed for ring-shaped devices with combined Bluetooth and NFC antenna assemblies. In one embodiment, an example device may include an inner shell, an outer shell coupled to the inner shell, where the outer shell and inner shell together form a first side portion, a second side portion, and a lower portion of the ring-shaped device, a battery, and an antenna assembly that forms an upper portion of the ring-shaped device. The antenna assembly may include a metal substrate, a ferrite layer disposed on the metal substrate, and a metallic loop structure disposed on the ferrite layer.