Gold purity is measured in karats (k), indicating the percentage of pure gold in an alloy. The higher the karat number, the purer the gold. Here’s a breakdown of each purity level and the differences:
24 Karat (24k)
Purity: 99.9% pure gold (24 parts gold, 0 parts other metals) Characteristics: The purest form of gold; it's soft, bright yellow, and more malleable. Uses: Generally used in high-value investment pieces rather than in jewelry due to its softness, making it prone to scratches and bending.
22 Karat (22k)
Purity: 91.6% pure gold (22 parts gold, 2 parts other metals like silver or copper) Characteristics: Slightly harder than 24k due to added metals; has a rich yellow color but is still relatively soft. Uses: Common in high-quality jewelry in countries like India, but less durable than lower-karat gold. Better suited for intricate designs than 24k but still requires careful handling.
21 Karat (21k)
Purity: 87.5% pure gold (21 parts gold, 3 parts other metals) Characteristics: Even more durable than 22k and less prone to wear but still maintains a bright gold color. Uses: Popular in Middle Eastern jewelry; suitable for daily wear but may not hold intricate designs as well as higher-karat options.
18 Karat (18k)
Purity: 75% pure gold (18 parts gold, 6 parts other metals) Characteristics: More durable and harder than higher karats, with a slightly less intense yellow color due to the higher alloy content. Uses: Common for fine jewelry worldwide, particularly in engagement rings and watches, due to its durability and balance between purity and strength.
Summary
Higher-karat gold (24k, 22k) is closer to pure gold, softer, and often used for investment pieces, while lower-karat gold (21k, 18k) is more durable and suitable for everyday wear. The choice depends on the desired balance of purity, durability, and intended use.