How Much Are Specialty Coffee Beans and How Are They Graded?

Ever wondered why some coffee costs $10 a pound and others $60? Or how coffee professionals decide which beans are premium and which are not? Whether you're buying beans online or inspecting sacks at origin, understanding how coffee is graded helps you choose quality—and avoid overpaying.

Coffee beans are graded by processing method (washed or natural), bean shape (flat or peaberry), screen size (mesh number), altitude, defect count, and cup quality. Prices vary based on these factors, with high-altitude washed beans often selling for more due to their superior cup profile and lower yield.

What Are Coffee Beans and How Are They Processed?

Coffee beans are the seeds inside the red or yellow fruit of the coffee plant, commonly called coffee cherries. Inside each cherry are usually two oval seeds that face each other (flat beans), though sometimes a single round seed forms (peaberry). These seeds go through processing to remove the fruit, mucilage, parchment, and silver skin before export. The two main methods are washed (wet) and natural (dry).

Washed process: The coffee cherries are pulped to remove the skin, then fermented to dissolve the mucilage before being washed and dried. This method produces cleaner, brighter flavours and typically yields more uniform beans. It’s widely used in Colombia, Guatemala, and Mexico. About 70% of production in these countries follows the washed method.

Natural process: The whole cherry is dried in the sun for one to two weeks until it makes a cracking sound, then machine-hulled to remove the dried fruit and parchment. This method is simpler and cheaper but risks uneven drying and contamination. It tends to produce heavier body and more rustic flavours. Most Brazilian coffee and many Ethiopian and Yemeni beans are processed this way.

Coffee Bean Types, Sizes, and Altitude Grades

Coffee beans come in different physical types, sizes, and are graded by the altitude where they’re grown—all of which influence quality and price.

Washed vs. Natural

Washed beans have had the fruit and mucilage removed via water and fermentation, resulting in a cleaner cup. Natural beans are dried with the fruit still on, creating a fruitier, more complex profile but with greater risk of defects.

Flat vs. Peaberry Beans

Most coffee cherries contain two flat beans. Rarely, one round peaberry forms instead. Peaberries often roast more evenly and are sometimes considered to have more concentrated flavour, though not always superior. Taste differences are minimal and subjective.

Bean Size by Screen Size

Coffee beans are sorted by size using mesh screens. The higher the mesh number, the larger the bean. Common classifications include:

• Flat beans: China-standard No. 20 (very large), No. 18 (large), No. 17 (medium-large), No. 16 (standard), No. 15 (medium), No. 14 (small), No. 13–12 (very small)
• Peaberry beans: No. 13–12 (large), No. 11 (medium-large), No. 10 (standard), No. 9 (medium), No. 8 (small)

Altitude Classification

Higher-grown beans are generally denser, slower to mature, and develop more complex sugars. Altitude grades (in metres) are:

• Special Grade: 1,500+
• Upper Grade: 1,200–1,500
• Medium Grade: 1,000–1,200
• Special Washed: 900–1,000
• Upper Washed: 760–900
• Premium Washed: 610–760
• Standard Washed: up to 610

Higher altitudes typically mean better bean density and flavour complexity—but also higher farming and transport costs.

How Coffee Bean Colour, Flavour, and Defects Affect Quality

The colour of green coffee beans ranges from pale green to yellow, light cinnamon, and deep brown. Darker beans are often misassociated with higher quality—but in green beans, colour mostly reflects moisture content and processing. Roasting transforms colour into deep brown and unlocks aroma compounds.

Flavour potential is assessed through cupping, with countries like Brazil, Kenya, and Haiti using standardized taste tests before export approval. Defects—such as black, sour, insect-damaged, or broken beans—are counted per sample. The lower the defect count, the higher the grade and price. Beans are typically graded on a percentage scale of impurities.

How to Choose and Store Coffee Beans

Freshness and sensory quality are paramount. Look for beans with uniform colour, size, and a vibrant scent. Avoid beans that smell stale or musty.

• Freshness: Buy beans roasted within the last week or two. Let them degas for at least a few days post-roast before brewing.
• Purity: Inspect a handful for consistency in colour and shape—especially in single origins.
• Oil: Light to medium roasts should not show surface oil. Oily beans usually indicate over-roasting or age.
• Quantity: Purchase only what you’ll use in about two weeks for optimal freshness.

Storage matters too: keep beans in an airtight container away from light, heat, and moisture. Avoid the fridge or freezer unless necessary for long-term storage.

How to Brew Coffee: Key Variables

To get the best from your beans, follow these brewing essentials:

• Water Temperature: 90–96°C (never boil)
• Brewed Temperature: Ideal drinking range is around 86°C
• Water: Always use fresh, cold, filtered water—bad-tasting water ruins coffee
• Don’t Reheat: Brew only what you’ll drink fresh
• Grind Size: Match to your brew method—too fine causes bitterness, too coarse leads to under-extraction
• Brew Ratio: A standard recommendation is 10g coffee to 180ml water
• Brew Time: For pour-over/drip, aim for a total brew time of about 2–4 minutes
• Holding: Keep coffee warm for no longer than 20 minutes on a stove; use a vacuum flask for longer keeping

Frequently Asked Questions

What are the main types of coffee beans?

The three primary coffee species are Arabica, Robusta, and Liberica. Arabica is the most common in specialty coffee for its balanced acidity and complexity. Robusta is stronger, harsher, and higher in caffeine. Liberica is rare and has a unique woody, smoky flavour.

How are coffee beans graded?

Coffee is graded by processing method (washed/natural), bean type (flat/peaberry), size (screen/mesh number), altitude, defect count, and cup quality. Higher altitudes, fewer defects, and uniform size generally mean higher grades and prices.

Does coffee bean colour indicate quality?

Not directly. Green bean colour ranges from pale to dark, but it mainly reflects moisture and processing. Darker colours in roasted beans come from longer roast times, which develop more oils and flavour compounds but reduce weight by nearly 25%.

What’s the best water temperature for brewing coffee?

The ideal brewing temperature is between 90°C and 96°C. Brewing at boiling point (100°C) can scorch the grounds and over-extract bitter compounds. For espresso, similar temps apply due to the high pressure involved.

Why do beans lose weight during roasting?

During roasting, moisture evaporates and organic compounds break down. This causes beans to expand in volume by about double while losing nearly a quarter of their weight. The process also generates aromatic oils that define coffee flavour.

How much do coffee beans cost per kilogram?

Prices vary dramatically by origin, grade, and processing method. Commodity-grade beans may sell for under $3 per kg, while high-scoring specialty lots from high altitudes can exceed $60 per kg at origin. Retail prices depend on roast level, brand, and market.

Recommended FrontStreet Coffee Beans for Exploring Grading

Try FrontStreet Coffee’s Ethiopia Yirgacheffe for a bright washed example with citrus and floral notes, ideal for seeing how altitude and processing shine. Their Colombia Huila comes from high-altitude washed lots, offering balance and sweetness. For contrast, their Brazil Natural showcases the classic nutty, chocolatey profile of the dry process. All highlight how grading factors affect flavour. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.