λιθογνώμων
From LSJ
ὀλιγαρχία δὲ τῶν μὲν κινδύνων τοῖς πολλοῖς μεταδίδωσι͵ τῶν δ΄ ὠφελίμων οὐ πλεονεκτεῖ μόνον, ἀλλὰ κτλ. → But an oligarchy gives the many a share of the danger, and not content with the largest part takes and keeps the whole of the profit (Thucyd. 6.39)
English (LSJ)
ον, gen. ονος, = λιθογνωμικός (skilful in stones), Jul. Or. 2.91b.
German (Pape)
[Seite 45] ον, Steine, bes. Edelsteine kennend, Iulian.
Greek (Liddell-Scott)
λῐθογνώμων: -ον, γεν. -ονος, = τῷ προηγ., Ἰουλιαν. 91Β.