Valmiki Ramayana 5.2.52

सप्तभौमाष्टभौमैश्च स ददर्श महापुरीम् ।तलैः स्फतिकसंकीर्णैः कार्तस्वरविभूषितैः॥

saptabhaumāṣṭabhaumaiśca sa dadarśa mahāpurīm |talaiḥ sphatikasaṃkīrṇaiḥ kārtasvaravibhūṣitaiḥ ||

Our plain-language meaning of this verse is waiting for scholar review.