Ring Marking
Ring Marking Question: Hello!
I have a ring that I believe is marked with SDC PLAT .48 (it’s slightly hard to read)
Pocket Ed. Jackson’s Hallmarks
Price: $14.50
I’ve done some research online and haven’t come up with many answers. Any help?
Thank you!
Wendy
Answer: G’day Wendy and many thanks for your query.
You are probably on the right track anyway, as PLAT is the stamp for pure Platinum. Generally, any marks after it shows the quality ie: PLAT850 shows it has 850 part per thousand of pure platinum while the other 150 parts are a mixture of other metal(s) in the alloy. This could be Ruthenium or Cobalt and Copper etc. They use many metals in the mix.
The SDC is simply the Manufacture or Maker’s Mark.
The most puzzling is the .48 which doesn’t make any sense?
I have seen rings stamped with 585PLAT415PALL which shows the breakdown between Platinum and Palladium - but that is as close as I can get. The .48 on its own means nothing in my experience.
Why not get your local FRIENDLY jewelry to do a full WRITTEN test on the item to confirm it is - what you think it is?
They will charge a fee - but at least then you’ll know.
You might also like to add this query to our Jewelry Forum where there are more ‘Experts’ to help you.
http://www.online-jewelry-appraisals.net/jewelry-forum/
I would also ask you to please Vote (below) on this article, and if you have any comments, would be very grateful if you could add some remarks. It will only take a couple of seconds, but the help it would provide to our efforts in answering questions would be amply rewarded - Thank you…
Hope this helps…
Tags: Cobalt, Copper, Gold, Hallmark, Hallmarking, Jewelry Manufacture, Makers Mark, platinum, ring, rings, Ruthenium
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July 18th, 2008 at 1:11 pm
The .48 refers to either the Center stone carat weight or the total carat weight of the item if there is more than one stone.
We are required in the US to stamp this by law, although not everyone does it.
My firm has been doing it for decades, so it should be quite common by now.
Hope that helps
July 18th, 2008 at 1:33 pm
G’day Jennifer and many thanks for your comment which is much appreciated.
However I have a problem here: The Manufacturer may know what gemstone they are going to place in any given setting, but as the diamond size may be different from say a Sapphire (weight for weight) how can you be sure this is correct?
A diamond may have been swapped for a Cubic Zirconia of the same size - but the weights will be quite different.
So how can you be sure it is what you think it is?