What is a "gem"?

A gem is a mineral crystal or organic material that is cut and polished to be used in jewelry or other decorative items. Gems are valued for their beauty, rarity, and durability, and have been used for thousands of years in various cultures as adornments and symbols of status and wealth. The most well-known gems include diamonds, rubies, sapphires, and emeralds, but there are many other types of gems, including lesser-known stones like topaz, tourmaline, and garnet. The value of a gem depends on a variety of factors, including its size, color, clarity, and overall quality.