Quenya 

ontamo

noun. mason (sculptor), mason, sculptor

A word a “mason (sculptor)” in notes from the late 1960s, a combination of ondo “stone” and tamo “smith” (PE17/107-108).

Neo-Quenya: For purposes of Neo-Quenya, I would use this word mainly for stone craftsmen = “mason”. For a stone artist = “sculptor” I would use ondomaitar.