If you find glassware that you love but aren’t sure if it’s crystal or glass, hold it to the light and look for a rainbow prism effect—if you see it, it’s usually legit. Or tap the glass and listen for a musical ring that’s typical of crystal. If it’s cut glassware, you'll tend to see more rounded, polished edges, while cut glass features sharper lines. And look to see if it sparkles—if so, it's most likely the real thing!