Check for slight surface imperfections and natural irregularities
Look for a soft, deep luster rather than a glassy shine
Rub two pearls gently together; real pearls feel slightly gritty
Inspect the drill hole for layered nacre, not a uniform coating
Examine the shape; real pearls are often not perfectly round
Feel the weight; real pearls are usually heavier than imitations
Test temperature; real pearls feel cool at first and warm slowly
Look for subtle color overtones and changing reflections
Use a magnifying glass to spot fine growth lines or layers
Have them tested by a certified jeweler or gemologist