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In today’s keynote, Apple showcased videos about the metal refining processes of both the stainless steel Apple Watch and aluminum Apple Watch Sport, but omitted the solid gold Apple Watch Edition video, which appeared on Apple’s website following the event.

Narrated by Jony Ive, the video provides an overview of the gold refining process, which yields a compound up to twice as hard as standard gold. The custom alloys of yellow and rose gold using precise amounts of silver, copper, and palladium to produce a specific hue of each color of gold.

The Apple Watch case, as well as the Digital Crown and the strap’s clasps, are crafted out of highly compressed and precisely milled ingots to produce dense, pore-free components of the Watch, which are hand-polished by highly skilled jewelry artisans.

Apple Watch Edition will be available in April at select Apple retail stores at a starting price of $10,000.