Wiktionary
n. 1 An expert in the cutting of diamonds into gems. 2 A member of a successful diamond-dealing family or group.
Wikipedia
A diamantaire (French origin) is a gem-quality diamond manufacturer or producer, master diamond cutter, and graduate gemologist specialized in diamonds.
Such individuals demonstrate considerable expertise in different types of gemstones, particularly when it comes to increasing the value and quality of a rough or raw diamond.
They are highly skilled craftsmen or artisans who are responsible for cutting, polishing and transforming a rough diamond into a finished gemstone ready for setting.
Members of diamond dealing families who have established themselves in the upper echelons of the world diamond industry hierarchy are also often referred to as diamantaires as well.
Usage examples of "diamantaire".
All the people in the trade are security mad and the diamantaires can be paranoid.
There was a ridiculous boom and a terrible crash in world diamond prices during the eighties and a lot of the diamantaires lost fortunes and went bankrupt and Mr.