Cadrans

Cad'rans noun [ Confer French cadran . Confer Quadrant .] An instrument with a graduated disk by means of which the angles of gems are measured in the process of cutting and polishing.
Found on http://www.encyclo.co.uk/webster/C/4

Cadrans

• (n.) An instrument with a graduated disk by means of which the angles of gems are measured in the process of cutting and polishing.
Found on http://thinkexist.com/dictionary/meaning/cadrans/

cadrans

instrument by which a gem is adjusted while being cut
Found on http://phrontistery.info/c.html
No exact match found