White fat that shines like a diamond — the treasure of Chiba’s pure Yorkshire breed, a jewel of the pork world.
Diamond Pork is a Chiba Prefecture brand pork maintaining the pure Middle Yorkshire breed — its greatest appeal, as its name suggests, is the brilliantly white fat shining like a jewel. The Middle Yorkshire breed, widely raised in Chiba Prefecture in the Showa 30s (1950s–60s), has been revived for the modern era, and by raising it carefully on a proprietary compound feed, the rich flavor that Japanese pork once possessed is conveyed to the present day. Unlike the common three-breed cross, the finely-grained meat quality unique to a pure breed produces a moist mouth feel. The fat is white with transparency — when it enters the mouth, an elegant sweetness and richness that spreads gently. Not merely soft — the deep umami felt with every chew is a defining characteristic — the appeal stands out most clearly in simple preparations that draw out the quality of the ingredient. Management is handled by the Chiba York Research Group, with production at 3 farms in Sosa City, Katori City, and Tomisato City. Shipping is at 230–240 days of age, body weight approximately 120 kg — raised more slowly than standard pigs. With slow growth and fewer piglets, annual shipments are approximately 1,000 head — a brand pork of high rarity value. Slaughter is carried out at Chiba Prefecture Meat Corporation, with distribution handled by Toso Meat Center. In shabu-shabu and sukiyaki, the sweet umami of the clear fat melts into the soup and broth for a truly exceptional dish. A specialty that can also be confidently recommended in preparations where the flavor of the pork itself is tested — such as tonkatsu and salt-grilling. When you encounter it at specialty meat shops or premium department store meat counters within Chiba Prefecture, please do pick it up.
Basic Information
- Name
Diamond Pork - Production Area
Three farms in Sosa City, Katori City, and Tomisato City (Chiba) - Management Body
Chiba York Research Association - Breed / Crossbreeding
Pure Middle Yorkshire - Meat Characteristics
Pure Middle Yorkshire fine-grained texture with moist, supple mouthfeel; luminously white fat with elegant sweetness and growing savory depth with each chew - Feed Characteristics
Proprietary compound feed formulated specifically for pure Middle Yorkshire - Shipping Age
230-240 days / approx. 120 kg - Annual Production
Approx. 1,000 head annually (rare). Primary wholesaler: Toso Meat Center. - Signature Dish
N/A - Certifications
Brand regulations established: November 5, 2004 (revised June 29, 2017) - Related URLs
Diamond Pork | Chibaza Pork
Buta Trace – Farm Traceability Detail - Source
Branded Pork Guidebook 2026, p.98
Chibaza Pork
Buta Trace Pig Traceability System
Last updated
6/21/2026