Matsya Purana — The Cave-Sanctuary: Jewel-Lake
मध्ये तु तस्याः प्रासादं निर्मितं तपसात्रिणा रुक्मसेतुप्रवेशान्तं सर्वरत्नमयं शुभम् //
madhye tu tasyāḥ prāsādaṃ nirmitaṃ tapasātriṇā rukmasetupraveśāntaṃ sarvaratnamayaṃ śubham //
In the very middle of that place, an auspicious palace was built by the power of austerity; its approach extended up to a golden causeway/bridge, and it was fashioned entirely of every kind of precious gem.
This verse is not about Pralaya; it describes ideal, auspicious construction—highlighting a palace placed at the center and approached by a golden causeway, emphasizing sacred order and prosperity rather than cosmic dissolution.
It reflects the royal duty to establish a well-ordered, auspicious seat of governance: a centrally placed palace, splendid yet ritually ‘śubha’, suggesting that wealth (gems, gold) should be aligned with dharmic planning and public order.
Key Vastu cues are the central placement (madhye) and the designed approach (rukma-setu) culminating at the entrance—signs of intentional axial planning; ‘sarvaratnamaya’ also signals a symbolic ideal of abundance and consecrated splendor in Puranic architecture.