Since 1982, Patek Philippe has provided essential reference works for enthusiasts, collectors and dealers in fine watches. The volumes, covering pocket watches and wristwatches, have played a large part in the renewal of interest in finest quality horology. Today, each of the publications in the Patek Philippe Collector’s Library explores the fascinating world of watches from a different angle. Beautiful photographs illustrate the watch references in the company’s 175 years of production.

These publications – from a detailed catalog to a unique book for a unique watch – contribute to a greater appreciation of horology and increase the pleasure of owning a fine watch. They will form the nucleus of every collector’s library.

5327J -001

A common white gold formulation consists of 90 wt.% gold and 10 wt.% nickel. Copper can be added to increase malleability. The strength of gold–nickel–copper alloys is caused by formation of two phases, a gold-rich Au–Cu, and a nickel-rich Ni–Cu, and the resulting hardening of the material. The alloys used in jewelry industry are gold–palladium–silver and gold–nickel–copper–zinc.

5320G-001

White gold is an alloy of gold and at least one white metal, usually nickel, manganese or palladium. Like yellow gold, the purity of white gold is given in karats. White gold's properties vary depending on the metals and proportions used. As a result, white gold alloys can be used for many different purposes; while a nickel alloy is hard and strong and therefore good for rings and pins.