What Does “PT950” Mean When It Is Stamped on a Ring?

PT is an abbreviation for platinum, and PT950 refers to the amount of pure platinum present per thousand parts. Since platinum alloys are approximately 90 to 95 percent pure, a greater proportion of an object’s mass is composed of the metal.

The number 950 frequently accompanies the PT acronym because the word “Platinum” must be accompanied by the purity for alloys of platinum between 850 and 950 parts per thousand. Platinum is more dense than gold and hence weighs more. Platinum is typically alloyed with iridium or ruthenium to enhance its strength because of its colour, hardness, and endurance. Platinum is more costly than white gold due to its greater density, purity, and manufacture time.

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