Really informative discussion Pallavi and Debby that you had back there.
I think more details to that story will be revealed soon. Like you said about the wealth tax, maybe that's why AG set the story in Samarkand which I think is in present day Uzbekistan. Maybe the royal family there are allowed to keep their jewels.
Probably he married an Indian woman who liked to wear sarees??
And yes 900 crores does sound like an awful lot. But that sarpech probably has some legendary status like the Kohinoor, fictional of course.
Oh and those royal families that you mentioned are never on the Richest Lists. Well, Qatar royals for one are far richer than the list toppers. But they would never let themselves be on such lists. It's all about exclusivity. So only the richest know each other and it's a very exclusive club, away from prying eyes.