Panasonic RP-HJE900 zirconia earphones

I’ve always associated zirconia with cheap jewellery from TV shopping channels, but Panasonic have seemingly chosen it for its ability to quell sound-distortion rather than its faux-glamour.  Their RP-HJE900 earphones feature zirconia casings that have particularly low resonance level, unlike traditional plastic shells.  They’re also much stronger than plastic, and resistant to scratches. Zirconia is both a high-density and high-rigidity material, hence being compared to diamond (and made