Both dense and soft, gold in its natural state possesses a bright yellow color. Used in jewelry, it is alloyed with other metals in order to reinforce its hardness. Depending on the metal with which it is alloyed, gold may take on different tones. The proportion of pure gold utilized in French jewelry is 75% and is designated by the value of 18 karats (18K). Yellow gold comprises 75% gold, alloyed with 12.5% silver and 12.5% copper. Enhanced by stones with warm tones, it reflects a timeless baroque spirit. White gold, also sometimes designated as gray gold, is composed of 75% gold, alloyed with silver, copper and sometimes palladium. Covered by a fine layer of rhodium, it has an exquisite white tone that combines perfectly with diamonds. Pink gold comprises 75% gold, 20% copper and 5% silver. With its exceptional delicacy this tint combines equally well with either white gold or yellow gold so as to enhance all skin tones.
With its intense silvery white color in its natural state, platinum is a precious metal that is much appreciated in jewelry for its unique properties. Malleable and elastic, platinum is one of the densest and heaviest of metals. It exhibits excellent resistance to rusting and corrosion, which makes it well fitted to withstand the wear and tear of passing time.
Platinum is used in jewelry when alloyed with 5% of palladium. It is still considered pure at millesimal fineness 950, allowing it to preserve its natural brilliant luster and to bring out perfectly the brilliance of diamonds.