Gems, also known as precious or semi-precious stones, are naturally occurring minerals or organic materials that are valued for their beauty, rarity, and durability. These stones are typically cut, polished, and used in jewelry or for decorative purposes. The value of a gem is determined by several factors, including its color, clarity, carat weight, and cut. Some gems, such as diamonds, rubies, sapphires, and emeralds, are classified as precious stones due to their high value and historical significance. Others, like amethyst, garnet, and topaz, are considered semi-precious stones but can still be valuable and highly sought after. Gems form deep within the Earth's crust under high pressure and temperature conditions over millions of years. Some, like diamonds, are created from carbon subjected to intense heat, while others, like opals and turquoise, form from mineral deposits in water-rich environments. In addition to their aesthetic appeal, gems have been used for various purposes throughout history, including spiritual and healing practices, royal adornments, and even technological applications. Certain rare gems, such as painite and red beryl, are so scarce that they are often more valuable than diamonds. Today, gems continue to captivate people worldwide, with gemologists studying their properties and collectors seeking unique specimens for their rarity and beauty.