Matsya Purana — Measures of Time: Caturyuga Computation
चक्रं रथो मणिर्भार्या निधिरश्वो गजस्तथा प्रोक्तानि सप्त रत्नानि पूर्वं स्वायम्भुवे ऽन्तरे //
cakraṃ ratho maṇirbhāryā nidhiraśvo gajastathā proktāni sapta ratnāni pūrvaṃ svāyambhuve 'ntare //
The cakra (sovereign wheel), the chariot, the jewel, the queen, the treasure, the horse, and likewise the elephant—these were proclaimed as the seven “jewels” (sapta-ratna) in the earlier age, in the Manvantara of Svāyambhuva Manu.
This verse does not describe Pralaya; it lists the classical seven emblems/resources of a universal monarch, framed as a tradition from the Svāyambhuva Manvantara.
It reflects Rajadharma by defining the ideal supports of kingship—legitimate sovereignty (cakra), mobility and force (ratha, aśva, gaja), prosperity (maṇi, nidhi), and stable polity/lineage through the queen (bhāryā).
No direct Vāstu or ritual procedure is stated; the verse is primarily political-ideological, cataloguing royal ‘ratnas’ rather than temple-building rules.