Apple Highlights the Production of the Apple Watch
https://nioclothingco.blogspot.com/2015/03/apple-highlights-production-of-apple.html
The 18-karat gold developed for Apple Watch Edition is up to twice as hard as standard gold.
Apple Watch features a high-strength alloy of stainless steel that becomes up to 80 percent harder through a specialized cold forging process.
The aluminum used to make Apple Watch Sport is 60 percent stronger than standard alloys but just as light.
