Adam Clarke on 1 Kings 10:27

Made silver - as stones - He destroyed its value by making it so exceedingly plenty.

As the sycamore trees - He planted many cedars, and doubtless had much cedar wood imported; so that it became as common as the sycamore trees, which appear to have grown there in great abundance. This is considered to be a tree that partakes of the nature of the fig tree, and of the mulberry. Of the former it has the fruit, and of the latter the leaves; that is, the fruit had a considerable resemblance to the fig, and the leaf to that of the mulberry tree: hence its name sycamore, from the Greek συκον, a fig, and μορεα, a mulberry tree.