"Gem quality" refers to the characteristics that make a gemstone suitable for use in jewelry and other decorative items. These characteristics include clarity, color, cut, and carat weight, often referred to as the "Four Cs." A gem with high quality typically has fewer inclusions, vibrant color, excellent cut, and a larger size, making it more valuable. The grading of gem quality is usually performed by professional gemologists who assess these attributes. Well-known gemstones like diamonds, sapphires, and emeralds can vary significantly in quality, affecting their market price and desirability. High-quality gems are often sought after by collectors and investors.