Hi,
Thank you for you time - any help would be very appreciated. I have attached some photos of the ring and the hallmarks.

Thanks for the excellent clear photos. Sorry - can't help. My feeling is that it is 1940's Australian - it would be very odd for UK precious metal of that period not to have UK hallmarks. I believe these days palladium is a very expensive metal and is mostly used as an alloy / substitue for white gold - yours looks like yellow gold, which would again point to 1940's. I wouldn't describe the circle mark as a T as the top quadrant seems to be "filled in" - but I don't know how I would describe it. All I can say is that it doesn't appear in the Australian jewellery reference books I have. The fact that it is a circle mark, rather than square or oblong, would again point to relatively modern (after say WW1) in Australia, rather than a historical mark. Being stylised, it does remind of UK import marks, or even the Utility Mark used during WW2, but it is not the same.

Thanks for your response. Sorry photo with 'T' is a little misleading as I think from the angle it is taken it looks filled in, but it isn't - I have attached another photo. Ring is definitely palladium and not yellow gold - it also has that 'patina' associated with platinum. However all your comments make sense. Thanks for all your time and your help. Cheers!

hiya, I think the T is the ring size , the initials inside the lozenge are the makers initials and its  18ct. as u stated..cheers.

After EIGHT YEARS, and given the OP hasn't logged into the boards for, you guessed it, EIGHT YEARS, I doubt it will help.