Cutting glass mosaics

I'm fitting some glass mosaic tiles 20mm x 20mm and some need to be cut. What is the best way to do this, I have diamond files to clean up cut afterwards?
Richard
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.