Gold is not a renewable resource–a natural resource that can be restored fairly easily. Scientists classify gold–along with diamonds, coal, silver and oil–as a non-renewable resource. Gold, an element and metal, is considered valuable because it is difficult to replace.
References:
University of Delaware Cooperative Extension: Renewable Natural Resources
US Rare Coin Investments: What is Gold?
Resources:
US Energy Information Administration: Nonrenewable
ThinkQuest: Renewable Resources
Jewelry Central: Gold Information