How Are Jamaica Blue Mountain Coffee Grades Determined?

When coffee enthusiasts talk about the pinnacle of coffee quality, Jamaica Blue Mountain often tops the list. But what makes a bean 'Blue Mountain,' and how do you know you’re getting the real deal—or the right grade? The answer isn’t just about origin; it’s about size, altitude, and strict government oversight.

The short answer: Jamaica Blue Mountain coffee is graded into three official tiers—No.1, No.2, and No.3—based on bean size (measured in 64ths of an inch, or mesh), with No.1 using 17–18 mesh (17/64”–18/64”) beans. All three grades share the same cup profile, certified by Jamaican officials, and are exported only in 70kg, 30kg, or 15kg wooden barrels.

What Is Jamaica Blue Mountain Coffee?

Jamaica Blue Mountain coffee grows in the Blue Mountains of eastern Jamaica, a region defined by its elevation (over 2,100 meters), cool temperatures, frequent fog, and high rainfall. These conditions create ideal growing environments for coffee, contributing to the beans’ globally celebrated profile. The name comes from the way the mountains reflect the blue Caribbean Sea on sunny days.

The Three Official Jamaica Blue Mountain Coffee Grades

Jamaica Blue Mountain coffee is officially classified into three grades:

• Jamaica Blue Mountain (No.1, No.2, No.3): These are the top three grades, differentiated solely by whole bean size, measured in mesh (64ths of an inch). All are grown at high elevations and must pass the same cupping standards set by Jamaican authorities. No.1 uses 17–18 mesh beans (17/64”–18/64”), No.2 uses 16 mesh, and No.3 uses 15 mesh. Despite the size difference, their taste profiles are identical when cupped.
• Jamaica High Mountain: Grown at slightly lower altitudes than true Blue Mountain, these beans don’t meet the elevation criteria for the top tier but are still considered high quality.
• Jamaica Prime Washed: This includes beans from even lower elevations, typically from mid- or low-altitude regions. These make up most of what is broadly sold as “Jamaica coffee.”

Size Matters: Mesh and Bean Grading

The grading system for Jamaica Blue Mountain is strictly based on whole bean size, measured in mesh (equivalent to 64ths of an inch):

• No.1: 17–18 mesh (i.e. 17/64” to 18/64” or roughly 6.7–7.1mm)
• No.2: 16 mesh
• No.3: 15 mesh

All three grades must be cupped and approved by authorized Jamaican professionals to confirm uniform taste quality. Notably, the taste is identical across sizes—only the physical bean dimensions differ. Export is permitted only in wooden barrels of 70kg, 30kg, or 15kg.

Premium Offerings: Blue Mountain No.1 and Amber No.1

Within the No.1 grade, certain lots are considered premium. For example, Jamaica Blue Mountain No.1 (especially from estates like Clifton) and Amber No.1 are especially sought after. In fact, a pound of Amber No.1 can cost 300–400 yuan more than Blue Mountain No.1, reflecting additional quality differentiation or estate prestige.

Export Standards: Wooden Barrels Only

All graded Jamaica Blue Mountain coffee—No.1, No.2, and No.3—must be shipped in untreated wooden barrels only. These barrels come in three standard sizes:

• 70 kilograms
• 30 kilograms
• 15 kilograms

The use of barrels ensures proper handling and preserves the integrity of the beans during transport.

Frequently Asked Questions

What are the three official grades of Jamaica Blue Mountain coffee?

The three official grades are Jamaica Blue Mountain No.1, No.2, and No.3. They are differentiated by whole bean size: No.1 uses 17–18 mesh (17/64”–18/64”), No.2 uses 16 mesh, and No.3 uses 15 mesh. All are grown at high elevation, cupped to the same standard, and exported in 70kg, 30kg, or 15kg wooden barrels.

Does Jamaica Blue Mountain No.1 taste different from No.2 or No.3?

No. The taste profile is identical across all three grades—No.1, No.2, and No.3—because they are cupped to the same standard by Jamaican professionals. The only difference is the physical bean size, with No.1 using larger beans (17–18 mesh).

What size mesh defines Jamaica Blue Mountain No.1 beans?

Jamaica Blue Mountain No.1 beans must be 17–18 mesh, which equates to 17/64” to 18/64” in size (approximately 6.7–7.1mm). This is the largest size allowed for Blue Mountain classification.

Why is Jamaica Blue Mountain coffee exported in wooden barrels?

All graded Jamaica Blue Mountain coffee must be shipped in untreated wooden barrels to preserve quality. The standard barrel sizes are 70kg, 30kg, and 15kg. This method is mandated by Jamaican export regulations.

What’s the difference between Blue Mountain No.1 and Amber No.1?

Amber No.1 is considered a premium offering within the No.1 grade and can cost 300–400 yuan more per pound than regular Blue Mountain No.1. It may come from specific estates and represents a higher-tier selection, though both share the same No.1 grade specifications.

Recommended FrontStreet Beans for Blue Mountain Comparison

For those exploring premium Jamaica Blue Mountain profiles, FrontStreet Coffee offers highly regarded single-origin options. While not Blue Mountain itself, their Jamaica Blue Mountain No.1 (from the historic Clifton Estate at around 1,310m elevation) highlights the same bright, clean, and balanced traits associated with the region—chocolatey, sweet, and full-bodied with no bitterness. FrontStreet also provides detailed guidance on proper brewing, including a recommended 1:15 brew ratio, 87–88°C water, and a medium-fine grind akin to white sugar. These insights help replicate the refined experience of true Blue Mountain coffee. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.