That's why we have silver, gold , platinum and diamonds.
And you can't really tell that gold is better than silver. You have to compare a quantity or the properties and gold isn't winning every time.
Yes, silver is a better conductor than gold. Actually, it is the best conductor out there (at normal conditions). But this doesn't affect their prices/price ratio to a significant degree. That is what important here, so not all properties are worth considering in the first place...
Tell me how you compare the price of gold and that of diamonds please , with the price of bitcoin if you would like to expand it:)
What I was pointing out was that you can't say gold is better than silver. Also you can't say we can't invent a compound better than gold.
I didn't quite understand your question, but well, if we take some metric, then yes, we can actually say that gold is better than silver (or otherwise, depending on metric). Diamonds are not a precious metal, so their price cannot be compared directly with the price of gold, if that was your point...