Kalamata olives are dark purple and originate from Greece. They're cured in brine to remove their bitter compounds and improve the taste.
Kalamata olives are dark purple, almond-shaped, and have a rich, fruity taste. Black olives are rounder and have a milder, even salty, taste. Kalamata olives are harvested when they are fully mature, but black olives can be harvested green .