Words used to express the idea of weightiness came to be understood figuratively to mean that which is treasured, magnificent, or impressive.
فَقَدِيمًا ،‏ كَانَتِ ٱلنُّقُودُ تُصَنَّعُ مِنَ ٱلْمَعَادِنِ ٱلثَّمِينَةِ .‏