2HF said:
Diamonds when used for industrial purposes are pretty valuable iirc.
A diamond sitting in a ring (read: anywhere other than industrial purposes) is absolutely worthless. No?
Let's start with the diamond ring. We're going to assume a loving relationship that lasts until death. Whoever is wearing the diamond ring is walking around with anywhere from hundreds (poor folk) to hundreds of thousands, if not millions, of dollars (rich folk) on their finger for absolutely no fucking reason!
*SNIP*
Diamonds are compressed coal. Coal is fossilized biomass. Considering as how there's a never-ending stream of dying people, animals, and plants on Earth, the number of diamonds in the world will only increase over time, and considering their hardness, they are very slow to decrease in number. Thus, by supply and demand, Diamonds should be worth less and less as time goes by.
This stands in stark contrast to Gold. All the gold on the face of the planet that has ever been found, and all that will ever be found, was deposited here by meteorites over 4 billion years ago when the earth was first hardening. There is no such thing as newly created gold. Newly mined, yes. Newly created, no. Big difference. Thus, as time goes on and we eventually deplete all the gold from every mining site around the entire world, gold will eventually hit a fixed supply that can never again increase, which due to use as gold dust in certain industries will then slowly decrease. This means that gold will continue to decrease in supply forever. Assuming it only increases in demand, Gold will be worth more and more over time.
So if you really want to take a scientific or economic approach to this, the truth is, Diamonds are indeed worthless, but that gold band you probably set the diamond in? Now that sucker is priceless!