If you need to go to a boutique in Paris to buy something, you know what to expect price-wise. The Tournaire Utopia headphones pile on the bling, using 18-karat gold, carbon fiber, 6.5 karats of diamonds, and lambskin leather in their construction. Are they the best sounding headphones in the world, too? No idea, I don’t have the €100,000 (about $123,000 right now) needed to buy a pair.