Monster has teamed with Korean artist and designer Sally Sohn for a pair of one-off Diamond Tears headphones. Hand-made, and taking more than 100-hours craft, the ultra-exclusive pair of headphones is headed to Harrods where it will sell for the equivalent of an astonishing $30,000. However, with components made from 18K gold and 5.56 carats of black diamonds, the pricing rationale becomes clearer.