You can buy really inexpensive diamond wheels for your Dremal or rotary tool at Princess Auto. Larger pairs of clippers also exist with an opening that could fit around a 3/4" coral skeleton. When I broke my little ones I bought one of these
http://www.blueworldaquariums.com/pr...p?prod=1254456 Tip to tip when fully opened is 1-1/4" and the finish makes them more corrosion resistant.