Choosing the perfect diamond involves understanding the Four Cs—Colour, Clarity, Cut, and Carat. Colour is graded from D (colorless) to Z (light yellow or brown), with less color indicating higher value. Clarity measures internal and external imperfections; fewer inclusions result in greater brilliance. Cut affects a diamond's sparkle, with well-cut diamonds reflecting light beautifully. Carat indicates size, with larger diamonds being rarer and more valuable. Understanding these aspects helps you find the diamond that best meets your preferences for beauty and value.