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How to tell a ring is platinum

P: 5/10/2007 4:08:13 AM
hellofish Rough Rock Total Posts: 12 Last Post: 5/10/2007 Member Since: 4/25/2007	Hello everybody! I'm considering getting a setting for my diamond from a small kiosk in one of those large jewelery districts. One of the vendors quoted me a price for under $400 for a nice platinum ring that he would make. Isn't that price a little too low? How can I tell that the ring is actually platinum, especially the crown? Does platinum always have "Plat" or "900" or "950" inscribed? If not, is there any other way to tell? Can an appraiser tell? Thanks, everybody!
Posted: 5/10/2007 4:08:13 AM

There are 3 replies to this message. There are 3 replies on this page.

P: 5/10/2007 11:36:51 AM
FireGoddess Ideal Rock Total Posts: 12,145 Last Post: 3/23/2009 Member Since: 1/25/2005	Platinum is significantly heavier than gold, so that's one giveaway. They are usually stamped PT950 or the like. Is it a plain solitaire? My plain pt solitaire setting cost about that price, but it wasn't custom.
Posted: 5/10/2007 11:36:51 AM

P: 7/1/2007 12:18:07 PM
norman_in_L.A. Rough Rock Total Posts: 40 Last Post: 11/13/2009 Member Since: 7/26/2004	Did you buy the ring? Let us know what happened! Norman Monteau Laboratory Director http://www.aiglabs.com American International Gemologists
Posted: 7/1/2007 12:18:07 PM

P: 7/1/2007 5:13:32 PM
Love in Bloom Ideal Rock Total Posts: 2,535 Last Post: 11/19/2009 Member Since: 3/31/2007	I think there are several ways to test if an item is platinum. Most of them are done by jewelers or appraisers. They can do a scratch test, melting point test, density test. If you are a do-it-yourself-er, the science geek in me is thinking the easiest way would be to test density. You do this by measuring the gram weight and dividing it by the amount (in milliliters) of water it displaces. I think the density of platinum is 21.4 g/ml. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ When the axe came into the forest, the trees said the handle is one of us. -bumper sticker
Posted: 7/1/2007 5:13:32 PM

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