Before Clara made the purchase, the jeweler handed her a vital piece of paper: the Diamond Certificate . "Never buy without this," he warned. "It's your only guarantee of the 4Cs—Cut, Color, Clarity, and Carat—which determine the stone's true global value".

: By purchasing from a wholesaler or a jeweler that sources directly from South African mines like Kimberley or Cullinan , she was avoiding the markup added by international distributors.

Her jeweler, a specialist at Shimansky , explained why her British Pounds were going so much further:

: Because the South African Rand (ZAR) had weakened against the Pound, the local price of the diamond—though pegged to the US Dollar—offered Clara an exchange rate advantage.

: Always insist on a certificate from a recognized laboratory (like GIA) to ensure the diamond's quality and resale value.