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pd ring
by: steve

In the UK some time ago, it wasn't uncommon for the band of a gem set ring to be made of one metal and the setting of the ring to be made of another. Qutie often you would have an 18ct yellow band and a platinum setting. Platinum was much stronger, and the white colour did not affect the colouring of the stones. These older rings were sometimes marked "18ct & plat".
What you may have here is a ring made of 9ct gold (that's the 375 bit) and a setting made of palladium (that's the pd bit), though its difficult to see from your picture.

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Marks that appear on Precious White Metal
by: Anonymous

Hi Tani thanks for writing in. The blue stone looks beautiful, is it an aquamarine?

For List of gemstones, click here.

OK. About some of the marks Tania, The UK precious metal fineness standards for Palladium is expressed as parts per thousand (ppt) and are as follows:
999
950
500

The UK precious metal fineness standards for Platinum is expressed as parts per thousand (ppt) and are as follows:

999
950
900
850

The UK precious metal fineness standards for Gold is expressed as parts per thousand (ppt) and are as follows:

999
916.6
750
750 (white gold)
585 (yellow, red, white gold)
375


Platinum is more expensive than gold and also weighs more.
Other marks for platinum include:
plat
plat 10% irid
platinum


Based on on the above you should now be able to work out what the "375" indicates. The other marks are probably the manufacturer's marks. To research any further we would need to see an image of the marks you describe.

best wishes,
Yvonne
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