Based on the Snettisham Torc, this Celtic Torc weighs 21.5 oz, 609 gms.  It is about 1 3/8" inches (3.5 cm) at the end and about 18 1/2" in total length (47 cm).  I am wearing the torc in the last picture and I have about a 17" neck.  The torc can be slightly bent to fit your neck and it may be possible to cast one to your own size!  The torc ends are available as a pair where you can add your own wire.