Not even close. Even at it's peak ivory was much less than gold per ounce. Ivory trade is now banned internationally though.
ivory is expensive
You are wrong. Copper is NOT more expensive than gold.
gold is more expensive than iron simply because iron is more common and gold is also a purer metal
As far as I know Spanish gold has been the most expensive. Perhaps not the rarest but the most expensive
It was made of Ivory, and the robes were made of gold plated bronze.
No, gold is around twice more expensive than iridium.
Titanium is generally less expensive than gold. The cost of titanium is lower due to its abundance and easier extraction process compared to gold, which is a precious metal with higher demand and value.
yes platinium is much more expensive than gold
No, gold is more expensive than silver as it is more rare
Yes.
Saffron
yes