Connoisseur (noun)

1. An expert in a particular field, especially one who is able to appreciate something in a discerning way.
2. A person who is able to make informed and expert judgements in any field, typically one of the arts or antiques.

Origin:

Late 17th century: from french connaisseur, from connaître "know", from latin cognoscere.

Examples:

1. He is a connoisseur of fine wines.
2. She is a connoisseur of art and can spot a fake painting at a glance.
3. He is a connoisseur of classical music and can tell you the composer of a piece just by listening to it.
4. The antique dealer was a connoisseur and could tell the value of a piece just by looking at it.
5. The chef is a connoisseur of spices and knows how to combine them to create unique flavors.