[jedrek]

Spot on.

A Rolex submariner weighs about 135g. Let's pretend that all but 35g of it is gold (it's less, but w/e). So we're at 100g of 18k gold. Now, 18k gold is 75% by mass, equal to 75g of 24k gold or $2900.

The cheapest, non-gold submariner costs $7500.

Buying gold watches to get the gold - or even considering the value of their alloys when buying them - is as dumb as doing the same with computers.