Check for a cool, smooth feel
Look for natural color variation
Inspect for tiny imperfections or fibrous texture
Test hardness; jade resists scratches from steel
Hold it up to light and check translucency
Compare the weight; real jade feels dense
Tap it gently; real jade makes a clear, ringing sound
Use a magnifying glass to examine the surface
Ask for a gemological certificate
Have a jeweler or gemologist test it professionally