Coffee culture

Specialty Coffee Blue Mountain Coffee: A Grading System Prioritizing Size While Accounting for Defects

Published: 2026-01-27 Author: FrontStreet Coffee
Last Updated: 2026/01/27, Although Blue Mountain coffee has a very small production volume, it possesses a strict grading system. Even when produced from the legally designated Blue Mountain region, it must be graded based on bean size and defect ratio. Blue Mountain No.1 bean size: 96% above 17/18 screen, defect ratio: 2%

FrontStreet Coffee · Introduction to Jamaica Blue Mountain Coffee Grading System

Although Blue Mountain coffee has a very small production volume, it possesses a strict grading system. Even when produced from the legally designated Blue Mountain region, it must be graded according to bean size and defect percentage.

Blue Mountain Coffee Grading

Blue Mountain No.1

Bean Size: Over 96% are 17/18 screen
Defect Percentage: 2%

Blue Mountain No.2

Bean Size: Over 96% are 16/17 screen
Defect Percentage: 2%

Blue Mountain No.3

Bean Size: Over 96% are 15/16 screen
Defect Percentage: 2%

Blue Mountain PB

Bean Size: Over 96% are peaberries
Defect Percentage: 2%

From the grading system of Jamaica Blue Mountain coffee, it's evident that Blue Mountain coffee has very high requirements for defect percentages. In all coffee called Blue Mountain coffee, defects cannot exceed 2%. Additionally, since all are from the legally designated region, grades are distinguished only by size. Therefore, for Blue Mountain coffee, besides grade, the vintage and specific estate origin become crucially important.

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