I would've gotten rid of it in the 1930's when people were starving to death on the streets. Just made up some ****-n-bull story about actually being the illegitimate, but much beloved, daughter of some Russian noble who'd been sent over to the US as a young child with some diamonds (to explain a lack of knowledge of Russia or of the Russian language, don't'cha know) who now needed the money and discretion, as several English members of the family would be mortified to learn of my existence, especially their beloved cousin and his legit family had been offed by the Russian peasants, but I was alive and kicking. ;-) I'd prize dimonads a few at a time and sell those suckers, in bits and drabs, then use the money to feed my own children and to help out my neighbors.
The big diamond, okay, so I'd still have it, but the rest would be long gone.