Since 2009, we have been aware of the practice of drinking gold in Henri's court, and how it ultimately cost Diane her life. That is why I was surprised to see this article on the most expensive desserts in the world, which have "edible gold" as a decoration.
It's called "culinary gold" and it can be bought at gourmet food shops quite reasonably, since it is extremely thin 22 karat gold leaf. Mixing it with silver makes it edible. According to one manufacturer, it passes from the body within 24 hours with no ill effects. This same manufacturer offers gold flakes to put into drinks.
Shades of Diane?