- (formerly) the highest degree of fineness in a diamond or other precious stone.Compare water(def 13).
- the finest quality; highest rank.
Origin of first water
Examples from the Web for first water
Historical Examples of first water
Yet they were constantly after him, for they knew they were likely to get a first-water gem.Mark Twain, A Biography, 1835-1910, Complete
Albert Bigelow Paine
An expert would have known immediately that it was a first-water product of an expert gunsmith.The Black Wolf Pack
She was got up expensive, all real lace and first-water sparks, and just as handsome as a towel rack.Shorty McCabe
- the finest quality of diamond or other precious stone
- the highest grade or best quality
- the most extreme kinda fool of the first water