Filled with shredded money, gold flakes, and gold ink, it looks like the floor of a particularly messy vault.
 
As a Tablebreaker-class d20, you'll be able to hear this thing thundering from across the room as soon as it lands on the table. A perfect die to make those important rolls feel that much more terrifying.
 
(Smaller d20 is a regular sized die used for comparison purposes.)