In order to confirm that a yellow sapphire is real, examine its color closely. Look for a bright, uniform yellow tint without any brown or green undertones. Verify clarity by looking for any obvious inclusions in the gem. Real stones frequently have inherent flaws. Examine the cut to make sure it is proportionately cut for maximum shine. Genuine yellow sapphires also have a very high hardness. To check for certain qualities, speak with a qualified gemologist or make use of gemological instruments like a jeweler's loupe. Genuine yellow sapphires are usually untreated, so steer clear of synthetic or treated stones. In addition, ask reliable sources to authenticate the gemstone with a certificate. Consider factors including color, clarity, cut, hardness, and certification to ensure that a yellow sapphire is real.