Hi Jacquelyne – Ann here.
The ring IS Hallmarked with 9ct PLAT which simply means it is 9 carat (karat) gold with Platinum (probably on the gemstone setting).
Please remember we can't see a photo (shame) of the item.
Now as to age – Just because we find something in a Stable doesn't mean it's a Horse – Please excuse my loose reference to the Birth of Jesus.
So just because something came from an Antique Store – doesn't mean it's an antique either. The TRUE meaning of the word Antique is an item made during the Georgian period.
Antique is NOW normally associated with items over 100 years old but in the States (you didn't say where you were from) it's acceptable if it's just 50 years old.
The stamp or hallmark on this ring would indicate items made after the second world war although again, as I can't see it – could be between the wars. So that would put it in the Vintage Jewellery class.
This mark would NOT impair the Value but it wouldn't get a 'Bump Up' in price like a full UK Hallmark would get.
Remember – it's still just a 9ct ring. Most of the value is in the gemstones and you mentioned they were Roby and diamond?
Please get this checked as diamond and precious gems were NOT OFTEN (again we can't see, measure or test) seen in 9ct gold.
cheers – Ann
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