It's sad that there has been no response (yet?) to your invitation. Not that I can help, being British/Welsh by birth and ancestry, British/English by domiciliation for the last 30 years and with more then 20 years of globe-trotting before that. (and thus thoroughly disqualified for the purposes of your study).
Nevertheless, your appeal stirs a couple of thoughts that might steer to you to the information you seek.
- You seek information on the jewellery buying habits of visiting Chinese nationals or of British/Chinese, of of both? Do you have any information on the size of that groups you wish to study and where they tend to congregate in the UK? It seems likely to me (working from first principles) that the above groups are likely to have different buying patterns. The former are likely to conform to some extent with the taste preferences of the socio-economic UK grouping of which they will be a part as well as, to some extent, of their cultural grouping. Beyond impulse buying of last-minute gifts at airport outlets, why should Chinese visitors buy jewellery in the UK where it is generally of higher price, like for like, and too often of inferior quality to that offered for sale in south-east Asia, China and the US west coast.
So, promising places to direct your research might be:
- UK localities with a high proportion (majority) of Chinese residents, e.g. the Gerrard St area of London WI. Where do they buy? What do they buy?
- A Gem-A Hong Kong branch view of the pros and cons of visiting Chinese buying jewellery in the UK as opposed to their home/neighbouring markets.
Hope this may help just a little. It would be nice to read the results of your study in due course.