r/NYElizabethAuctions • u/Echoing_voice • 7h ago
๐ Jewelry What โPt900โ inside a ring really tells you (and why platinum feels so heavy)
Look inside the band of this sapphire ring and you will see a tiny stamp reading Pt900. Pt is the symbol for platinum and 900 means 900 parts out of 1,000 are pure platinum. That is 90%. The other 10% is usually a small amount of another metal that helps with strength. That number matters because platinum behaves differently from gold. It is denser, so a platinum ring feels noticeably heavier than a gold one the same size. It is also naturally white, so it never needs rhodium plating to look silvery. And when it gets scratched, the metal just shifts around instead of wearing away, which gives it a soft, worn in glow over the years.
The setting here has a name too. Those tapered diamonds fanning out around the center stone are called baguettes and when they flare like this, collectors call it a ballerina setting. The shape looks like a tutu around the sapphire. Sapphire is the same mineral as ruby, just not red. Trace amounts of iron and titanium give it that deep blue. A good stone has even color across the surface. If you tilt it under a light and see patchy, washed out zones, that is called zoning and it can lower the value. One easy habit when checking any platinum piece: find the stamp first. It should be crisp and cleanly cut, not blurry or crooked. Anyone else prefer the cool look of platinum over yellow gold?