Veritable - gold can easily be verified as genuine. Unlike paper currencies or even coins made with base metals, it is impossible to counterfeit gold coins. You might pass one off for a short time, but there are simple tests (weight, dimensions, specific gravity) that anyone can perform with the most rudimentary tools to confirm if your coin is genuine gold. (A ruler, a scale and a beaker of water in this case).
Is it basically because gold is one of the heaviest methods and most other things heavier than gold are actually
more expensive, so cutting a gold coin with platinum wouldn't make sense?
Also, tungsten has specific gravity very close to gold. Isn't it possible then to cut a golden coin with tungsten?