美国“钻石牌”核桃,主要包括哈特利、培尼、希尔、爱西丽等品种。这些品种集中具有个大皮薄、果仁饱满、色佳味香、出油率高、丰产稳产的特点。为了吸引众多客商的青睐,精明的美国人以工艺手段在每个核桃壳上标注出“钻石牌”字样,宛如在果壳上长成的一般。从而使其走俏世界,长期享有声望,并垄断了国际核桃市场。 The United States “diamond” walnuts, including Hartley, Penelope, Hill, love Xili and other varieties. These varieties have a large concentration of thin skin, nuts full, good flavor and color, high oil yield, high yield and stable yield characteristics. In order to attract the favor of many merchants, shrewd Americans to craft means in each walnut shell marked “diamond card” words, like the growth of the general in the shell. Thus making it popular in the world, long enjoyed prestige, and monopolized the international walnut market.