Buddy, while he comes back and confirms on this, just think for once if it would be sustainable for banks to offer 5x on Jewellery. I checked with the CC on crediting 5x points earlier and they said yes they did initially but later when bank found it out, it was addressed in the system. Now no more. If they still do, I will be happy as I have some Jewellery to purchase.
BTW, banks, like any vigilant orgs, find out a lot including the loop holes, glitches etc from such discussions in such forums and social media 🙂