Gold is alloyed with a mixture of metals like silver, copper, nickel and or zinc to give it strength and durability. Gold jewelry in the United States is typically 14 karat or 18 karat gold, the higher the number the higher the content of gold. Platinum is a very durable precious metal and is a perfect for showcasing diamonds. Platinum is a dense metal that wears extremely well and is identified by the mark 950 and or plat. Platinum jewelry may require rhodium plating over the years to maintain its original appearance. All that is required to keep your jewelry looking its best is warm water and a non detergent liquid soap applied with a soft bristled toothbrush. Keep your jewelry away from harsh chemicals such as chlorine and cleaning fluids.