We can divide natural resources into two basic categories: renewable and nonrenewable. Consider the bar graph of resource usage.
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Usually the price of minerals depends on it's rarity and it's distinguishing characteristics. Diamonds are rare, and are also the hardest, and rubies are rare and come in various bright red - ish/purpule - ish/pinkish colours. These minerals are called gemstones.
→ The image below shows you a ruby and a diamond.
Hope it helped,
BioTeacher101
