Platinum is the metal commonly cited as roughly 30 times rarer than gold, based on annual mine production. Only a few million troy ounces are produced each year, far less than gold output.
Platinum comes mostly from South Africa and Russia, and its scarcity, high melting point, and resistance to corrosion make it prized for jewelry, industrial catalysts, and medical devices.
Some sources apply the same “30 times rarer” claim to rhodium and palladium, since all three belong to the platinum group metals family, but platinum is the term most often paired with this specific comparison.