This Triskele Pendant has simplified bird heads in spiral design. The artifact that this design comes from dates to ~ 200 BC in Germany. It decorated the top of a brass sword scabbard. Likely the heads represented eagles or ravens. Ravens and other corvade mate for life and often can be seen bringing up their single offspring until it reaches maturity. Eagles were seen as royal symbols of nations because they were the largest birds of prey, and for their range.
The dimensions are ~ 2.5cm in diameter and I make 1.2cm matching earrings as well.