Do they have records of gold jewellery worn by every person when someone leaves india?So say you went to Dubai wearing no jewellery and u return wearikg one chain, 2 Bangles and 1 ring, it should not stand out and get noticed by customs. If they ask, say u wore that from India and went. Now this does not mean that jewellery is noticable, like a very fat chain or fat bangles,. As long as it's subtle it will go unnoticed. But I'm this case you can't claim vat at the airport.
There is Malabar jewellers in dxb, you could check with them if the jewelry you buy from there is accepted in Malabar India for exchange.
I don't think this is been done as of now