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Keywords are:  'skill crafting diamantaire'

Skill: diamantaire              Lvl 35  Any  (85%)
                                (helpful)   Requires: spangler
                                Group: Lapidarists Guild Trade Skills
                                Profession
                                Guild: The Lapidarists Guild  Rank: Grand Master

A lapidarist trained as a 'diamantaire' represents the peak of their
craft. They can cut, split and polish extremely hard stones such as
diamonds, rubies, emeralds, topaz and sapphires with nearly the ease
that their less skilled guildmates can cut quartz.