Ramayana
वैडूर्यकृतसोपानं किङ्किणीजालकं तथा । दान्ततोरणविन्यस्तं वज्रस्फटिकवेदिकम् ॥ 7-13-5 ॥
That palace had stairways made of lapis lazuli and a network of little bells, gateways inlaid with ivory, and platforms of diamond and crystal.
english translation