Kev, I know what you are getting at. OP's pictures do not make the decor look either as intricate or the same colours as the vases I linked to. However, I think, looking at OP's very first picture of the base, that it is the same decor, which may either be a different colourway (reversed colours ) or is the same but not lit and photographed as well as the ones I linked to.
I have a green iridescent piece that also has the gold ink-etched process on it. It's incredibly hard to photograph and make it look good - and it is very beautiful in real life - as lighting it is key to making it representative of the decor in real life.
Also if you compare OP's very first photo of the base in first post, with the last pic in OP's second post you will see that they look like two completely different bases because the iridescence and colour is completely flattened out in the last pic in second post.
OP, if you can get your vase inside and have light shone on it so it shows all the iridescence in separate bandings, that would help. It should look like your very very first pic on here (the too small base pic) where you can see the different alternate colours of orangey gold iridescence and then blue iridescence in the stripes, all with the thin gold ink-etched lines outlining each section. Don't take the photo with the flash on. Flash takes away all the nuances of the iridescence. You just need to have it lit well with soft but not directly on it, lighting.
Kev, the poster on CW makes the point that 'The glass is a deep cobalt blue, and is painted in violet and gold iridescent ink in waves of zig-zag lines in the vase body'. I think it wears off. I think this has happened to the goldy bits on OP's vase body. On my piece the gold has worn off in quite a few places leaving it still looking pretty but it's difficult to see the flowers on the pattern on mine because it is worn.