Coffee Bean Grading Terms Explained

When you buy green coffee beans, especially for specialty roasting, you’ll often see terms like ‘SHB’, ‘quakers’, or ‘floaters’ on grading sheets or invoices. But what do they really mean? These aren’t just random labels—they reflect real physical traits that affect roast quality, flavor potential, and market value. If you’ve ever wondered why some beans cost more or roast differently, these grades hold the answer.

In short, coffee bean grading terms classify defects, processing types, bean density, and physical abnormalities. Key terms include SHB (Strictly Hard Bean) for high-altitude dense beans, quakers for underripe beans, and floaters for low-density or overripe beans. These categories help roasters assess bean quality before roasting.

Common Green Coffee Defects

Green coffee beans can have a range of visible defects that signal problems during growth, harvest, or processing. These include:

• Black Bean: Caused by pests, fallen overripe or decomposed fruit, or metal contamination.
• Brown Bean: Over- or under-fermented Arabica, or unwashed and dirty beans.
• Discolored Bean: Unusual colors (e.g., green or blue in Arabica, khaki or pale in Robusta) indicating poor processing.
• Floater: Low-density beans that float during washing—often overripe, immature, or brown.
• Stinker: Overripe, fermented, or pest-damaged beans with foul odors, often invisible until UV sorting.
• Quaker: Underdeveloped beans similar to pale beans, but not caused by immaturity.
• Pale Bean: Yellow due to unripe or drought-stressed cherries; leads to poor roast color.
• Ragged Bean: Underdeveloped due to drought.
• Broken Bean: Fragile beans that break during hulling from over-drying.

Bean Size, Shape, and Processing Types

Coffee beans also vary in size, shape, and how they’re processed. Key terms include:

• Elephant Bean: A large bean from the Maragogype variety; prized for its size and mild cup.
• Peaberry : A rare mutation where a single round bean forms instead of two flat ones; often sorted and sold separately at a premium.
• Hard Bean (HB): Arabica grown at medium-high altitudes; less dense than SHB.
• Strictly Hard Bean (SHB): Grown at very high altitudes, these beans are denser and have better flavor potential.
• Strictly High Grown (SHG): Essentially the same as SHB, denoting high-altitude origin.
• Natural Bean / Unwashed: Dry-processed beans with the cherry dried around the seed.
• Washed: Wet-processed beans with the fruit removed before drying.
• Hull Coffee: Coffee with the dry husk removed before the parchment layer.
• Parchment: The protective outer layer around the bean in dry-processed lots; must remain intact for seed viability.

Other Important Grading Terms

Some grading terms refer to bean density, processing flaws, or visual anomalies:

• Golden Bean: Medium-large beans between regular and large sizes.
• Elephant Ear: A deformed cherry containing one large and one small bean; both can roast well.
• Pod: A defect where dried fruit flesh remains around the bean after processing.
• Pulper-Nipped: Beans damaged by the pulper during processing, lowering cup quality.
• Level Triage: The lowest grade; defective beans not fit for export.

Frequently Asked Questions

What does SHB mean in coffee grading?

SHB stands for Strictly Hard Bean, referring to high-density Arabica beans grown at very high altitudes. These beans typically develop more complex flavors and are denser, which affects how they roast. SHB is often used interchangeably with SHG (Strictly High Grown), as both indicate premium growing conditions.

What are quakers in green coffee?

Quakers are underdeveloped green coffee beans that don’t darken properly during roasting. They often result from unripe coffee cherries and can create off-flavors in the cup. While sometimes confused with pale beans, quakers are specifically linked to immaturity rather than environmental stress.

Why do some beans float during processing?

Beans that float during washing are called floaters. They’re usually low-density due to being overripe, immature, or damaged. Floaters are typically considered defects and are removed during quality sorting to maintain batch consistency.

What is a peaberry coffee bean?

A peaberry (or ) is a rare, naturally occurring mutation where a single round coffee bean forms inside the coffee cherry instead of the usual two flat beans. These beans are often separated and sold as a specialty grade due to their distinct shape and sometimes enhanced cup profile.

What’s the difference between washed and natural coffee beans?

Washed beans have the fruit pulp removed before drying, resulting in a cleaner, brighter flavor. Natural beans are dried with the cherry still on the seed, creating a fruitier, heavier-bodied cup. The processing method significantly impacts the final taste of the roasted coffee.

Recommended FrontStreet Beans for Grading Study

Explore green coffee defects and processing differences with FrontStreet Coffee’s Yirgacheffe Grade 1 (washed, bright and clean), Ethiopia Guji Natural (dried-in-cherry, fuller body), and a selection of SHB-grade Colombian beans. Each shows how processing and bean origin affect cup characteristics. FrontStreet also stocks peaberry lots on request. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.