That is our fellow forum member @Nakul
But I am also interested in knowing about this. From what I am able to find, there is little clarity about this currently. I have seen various articles which claim that capital gains will not be exempt for secondary market purchases (one such article led to question my initial assumptions that they were exempt in this forum thread). But on the other hand, on Twitter, people still believe that capital gains are exempt on secondary market purchases of SGBs -