Sometimes you might hear the term ‘High Karat Gold’ and not understand just what this is. High karat gold is 18 karat gold or higher
Gold Jewelry the number means:

917 = 22K, 91.7% Gold,
875 = 21K , 87.5% Gold
750 = 18K, 75% pure Gold
585 or 583 = 14K, 58.3% Gold
417 = 10K, 41.7% Gold
Higher the number the more gold content to some 417 is a high enough gold content for their jewelry. Others aren’t satisfied with anything with a gold content that is less than 875. It’s important to remember the higher the gold content the softer the piece of jewelry. We never recommend a gold content above 750 for diamond and gemstone jewelry. Next time you see a rich yellow colored gold piece of jewelry chances are its ‘High Karat Gold’