Help on returning goods

Just returned from a wonderful holiday in Icmeler.
I purchased an engagment ring from Arica Jewellery after the seller gave his word that the ring was Clarity VVS1 and colour G
Ive had it valued on my return and it is in fact a SI colour J.
The valuation is more than I paid but I am unhappy with the lies and would like to return the ring so I can get one of better quality from somewhere else.
Can anyone advise on the returns proceedure and if it is possible for me to do this?
Ive emailed the jeweller but im not expecting a speedy response!
Thanks for any advice anyone can give!
I purchased an engagment ring from Arica Jewellery after the seller gave his word that the ring was Clarity VVS1 and colour G
Ive had it valued on my return and it is in fact a SI colour J.
The valuation is more than I paid but I am unhappy with the lies and would like to return the ring so I can get one of better quality from somewhere else.
Can anyone advise on the returns proceedure and if it is possible for me to do this?
Ive emailed the jeweller but im not expecting a speedy response!
Thanks for any advice anyone can give!