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.
Rating
Marks that appear on Precious White Metal by: Anonymous
Hi Tani thanks for writing in. The blue stone looks beautiful, is it an aquamarine?
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:
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.
