Origin: The country or region where the coffee beans were grown. Different origins produce beans with different flavor profiles.
Species: There are two main species of coffee beans: Arabica and Robusta. Arabica beans are generally considered to be higher quality, with a more complex flavor. Robusta beans are more acidic and bitter, but they also have a higher caffeine content.
Bean size: Larger beans are generally considered to be higher quality.
Moisture content: The moisture content of green coffee beans should be between 10% and 12%.
Defects: The number of defects, such as broken beans, insect damage, and mold, should be minimal.
