In November last year, a 200mg sample of lunar material brought
back by the Soviet Union's robotic Luna-16 in 1970 sold at Sothebys for
USD855,000 (AUD1.22 million).
The sample was originally presented by the Soviet Government
to Nina Ivanovna Koroleva, the widow of former Soviet space
program director Sergei Pavlovich Korolev.
That makes the price of lunar rock, backed-up with provenance,
over 94,000-times the current spot price of gold.
Story here :-
https://www.forbes.com/sites/kionasm.../#7d0e4ddb7f7d