瑕不掩瑜

lit. a blemish does not obscure jade's luster / the pros outweigh the cons (idiom)

blemish / flaw in jade

no; not so / (bound form) not; un-

to cover up / to close / to surprise

to cover up; to conceal / to close (a door, book etc) / (coll.) to get (one's fingers etc) caught when closing a door or lid / (literary) to launch a surprise attack

excellence / luster of gems