Platinum is a type of precious metal jewelry that costs more than gold. It usually is mixed with other similar metals, known as the platinum group metals: iridium, palladium, ruthenium, rhodium and osmium. Platinum group metals are naturally white and offer superb stone security because they have minimum "spring back," the tendency of metal to spring back to its original position and not stay in the place it was bent.
Platinum is a very heavy metal, weighing 60% more than 14 karat gold, and is also very dense. When other metals are scratched, they actually lose a slender thread of metal. Platinum will scratch, but it generally will not chip or splinter. Over time, with wear, platinum will develop a patina that is unique to this metal. If you prefer a brighter, cleaner look platinum can be buffed to return it to its original brightness.
*some information sourced from www.americangemsociety.org/all-that-glitters