n.圆粒金刚钻; 圆粒金刚石

bort bit → 金刚石钻头；不纯金刚石钻头
shot bort → 高硬圆粒金刚石
stewartite bort → 磁性下等钻
common bort → 普通工业钻；下等金刚石
round bort → 圆粒钻石
river bort → 河水劣质钻
Dutch bort → 荷兰圆粒金刚石
structure bort → 构造圆粒钻；工业级金刚石
hailstone bort → 雹子圆粒钻石；圆粒金刚石；雹子圆粒钻石圆粒金刚石