Aww, I thought that said lead Go stones. Not quite as cool.
I heard a similar thing recently in the context of Norse culture. A tafl game board was found, along with other “masculine” grave offerings, in a Scandinavian (or was it Icelandic?) tomb, but the skeleton was discovered to be female.
I wonder if we have any evidence for whether a Go or other board game set was or wasn’t a gendered grave good in ancient Oriental culture… although likely the geographic and temporal scale makes assessment of that pretty much impossible.
There are some old pictures of women playing Go, as all respectable forum-goers 
know from Images of olden times (which could do with a bump, by the way – it hasn’t had one since July).
So that’d suggest that Go boards weren’t a gendered offering, although those illustrations were probably made closer to the present day than to the Silla period (57 BCE – 935 CE, or 696–1688 AUC if you prefer one-dimensional date ranges).