An act of Louis IX of France (1214 - 1270) established a sumptuary law reserving Diamonds for the King indicates the rarity and value of this gem.

• 法国国王路易斯四世(1214-1270)就颁布了一部钻石禁奢令，只有国王才有权拥有钻石，此事佐证了钻石在那时也成为稀有和价值的代名词。