There are two major species of coffee, Arabica, and Robusta. Kona coffee is an Arabica coffee. Arabica coffee is generally considered to be a high quality coffee with a delicate and flavorful taste. Robusta species are considered lower quality and are found in instant coffee and the canned blends on most supermarket shelves.
Kona coffee is sorted by size and by density in the Dry Milling process.The standards for coffee are defined in the Hawaii administrative rules chapter 4-143,beans are inspected by the State of Hawaii department of agriculture before shipment.
There are 8 specifications/standards for coffee.The primary standards are size bean and defects/imperfections. All coffee is also inspected for moisture, type bean, color,roasting quality and aroma.

Kona Grades Are:
Kona Peaberry - Type II bean, typically 10 screen, 18 full imperfections per 300 gram sample
Kona Extra Fancy - Type I bean, 19 screen size minimum, 8 Full imperfections per 300 gram sample
Kona Fancy - Type I bean, 18 Screen Size minimum, 12 Full Imperfections per 300 gram sample
Kona No 1 - Type I bean, 16 screen size, 18 Full Imperfections per 300 grams sample
Kona Prime - No Size Standard, Color Standard or Roasting Quality Standard. 15% Defective Beans based upon Weight
Hawaii No 3 (XXX) - No Size Standard, Color Standard or Roasting Quality Standard. 35% defective beans based upon weight. (Kona Star does not sell Hawaii No 3)
For the Complete Standards visit - http://www.hawaiiag.org/hdoa/adminrules.html