first water

The phrase "first water" is an idiomatic expression that is used to describe the highest quality or the very best of something. It originates from the diamond industry, where gemstones are classified into different categories based on their clarity and purity. Diamonds of the finest quality and highest purity are often referred to as "first water" diamonds, emphasizing their exceptional value and brilliance. Over time, the phrase has been extended to other contexts and can be used to describe the top tier or the most exceptional version of anything.