Most of the rare earth metals.
No. Platinum is worth far more.
No, by weight, a diamond has higher value than platinum.
Platinum tends to be worth more than gold by weight, but as prices fluctuate, sometimes the gold price does go higher than the platinum price. Silver, at least in recent history (probably all of history) is worth significantly less than both gold and platinum.
A platinum cube will be worth a lot more than a silver cube of the same size, and the platinum cube will weigh a lot more (more than twice).
Of equal weight, and of best quality, diamonds are worth more than platinum.
The US does not make platinum quarters because everyone would keep them for the platinum that is inside them and they would be worth way more than a quarter.
It's worth more because it is used more and Minned more at the moment in Jewellery especially
Yes, the price for Tc-99 is higher.
In album sales, a 1,000,000 selling record is platinum. A multi-platinum is 2,000,000 or more (usually known as '2 times platinum'). An album with 10,000,000 units sold is a diamond album.
Silver is a soft metal. Platinum is a similar color but does not change its shape easily and does not tarnish. Platinum is worth more than silver and gold.
diamonds?
Yes. And it is worth much more than gold, so don't put it in the recycling bin.