After going through several options, I find Gem Pundit perhaps a very good online one stop shop for your needs. Have just had the experience of purchasing some high quality IGI certified products. The website is user friendly. The support service is very good. I have had Kumar Gaurav & Akhilesh be in constant touch at all times and are very patient with your queries and help you make requisite selection easy. IGI certification takes times but it is worth it. The products were made fast(3 to 4 days). Thereafter, the delivery has been in less than 24 hours by courier(I am based in Bangalore). The finish of the products has been of very good quality.
In short, fabulous experience and the product quality and finish is accurate to what is discussed with you by Kumar & Akhilesh(support service).
All the best. Thank you