A Colombian coffee gradeThe rating of either a sample or a full lot, according to national standards for export. Nearly every county of origin has its own grading scale. It can... referring to screen size of 15-16. In the traditional bulk ArabicaArabica refers to Coffea Arabica, the taxonomic species name of the genus responsible for around 75% of the worlds commercial coffee crop.: Arabica refers to Coffea Arabica, the... business, Excelso is a step below the large bean SupremoA Colombian coffee grade referring to screen size of 17-18 screen. In the traditional bulk Arabica business, Supremo was the top grade Colombia, with Excelso one step below... grade, which indicates screen size 17-18.