Cuff's presentation to Lady Verinder of his suspicions of Rachel and her motives centers on a conjecture of private debts that Rachel might owe. Though Lady Verinder remains unconvinced, and indeed, we will see that Rachel has no debts, the dynamic of debt will work throughout The Moonstone as motivation for theft of the diamond. The diamond can be used as potential surety to a moneylender in lieu of cash. This English dynamic of economic debt allows us to see the transformation of the diamond from its spiritual significance as part of a religious idol, to sentimental significance as a family heirloom, to economic significance as a commodity to be bought or sold.