妙法蓮華經玄贊 2.164

2.164

七寶中：一金，《說文》「金有五色，黃為其長，久𮒰不生、百練不輕、徙革不違。西方之行出於土，從土左右，所以金字象金在土形」，今亦聲也。二銀，白金也。三珊瑚，紅赤色石脂，似樹形。四真珠，即赤真珠。《佛地論》云：「赤虫所出，或珠體赤名赤真珠」。五摩尼者，如意神珠。既無琉璃，便開珠二。六車𤦲，梵云牟娑洛揭婆，青白間色。七馬瑙，梵云遏濕摩揭婆，此云杵藏，或言胎藏者，堅實故也。色如馬腦，故從彼名作馬腦字。以是寶類故字從玉；或如石類，字或從石。此七不同，隨方所重，如《上生疏》。

Among the seven treasures: First, gold. The Shuowen says: "Gold has five colors, yellow being the foremost; it does not rust when buried for long, does not lighten when smelted a hundred times, and does not alter when reshaped. The phase of the west emerges from earth; it follows the earth left and right, so the character jīn (金) resembles the shape of gold within the earth." It is now also phonetic. Second, silver, which is white metal. Third, coral, a red stone resin resembling the shape of a tree. Fourth, pearls, that is, red pearls. The Buddhabhūmi-vyākhyāna says: "Produced from red worms, or the body of the pearl being red, it is called a red pearl." Fifth, maṇi, the wish-fulfilling divine jewel. Since there is no lapis lazuli (vaiḍūrya), pearls are split into two. Sixth, musāragalva, in Sanskrit called musāragalva, variegated blue and white. Seventh, agate, in Sanskrit called aśmagarbha, translated here as "pestle-womb," or called "embryo-womb," because it is hard and solid. Its color resembles a horse's brain, so taking that name it is written with the characters mǎ nǎo (馬腦). Because it is a category of treasure, the character takes the jade radical (瑪瑙); or as it is of the category of stone, the character sometimes takes the stone radical. These seven vary according to what is valued in each region, as in the Shangsheng shu.