No. They mean the same thing.
The 18kat gold is worth more because the higher it is the more value it has
most expensive
Yes - 22ct is a much higher purity than 9ct gold.
Fire opal:)
yes
yea the more ct the more money
Gold is tremendously more expensive than titanium.
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
Pure yellow gold is more expensive than an alloy.
No, gold is more expensive than silver as it is more rare
Depends on the other metals used to alloy but, in general, 18ct will look more yellow as it contains more gold in the alloy than 14ct.
yes platinium is much more expensive than gold
Platinum is more expensive than gold because of the difficulty associated with mining it. Platinum is harder to mine than gold, which means it requires more energy and effort to extract.
White gold can cost a little more than yellow gold but not prohibitively so.
Saffron
Platinum