Matsya Purana — The Syamantaka Jewel Episode and the Vrishni–Sainya Genealogies
स्यमन्तकः प्रसेनस्य मणिरत्नमनुत्तमम् पृथिव्यां सर्वरत्नानां राजा वै सो ऽभवन्मणिः //
syamantakaḥ prasenasya maṇiratnamanuttamam pṛthivyāṃ sarvaratnānāṃ rājā vai so 'bhavanmaṇiḥ //
The Syamantaka—Prasena’s unsurpassed jewel—became, upon the earth, the sovereign among all gems.
This verse does not discuss Pralaya; it focuses on the worldly renown and supremacy of the Syamantaka jewel within a royal narrative.
By calling the jewel the “king among gems,” the verse frames wealth as a power-symbol that attracts attention and contention—implying the king/householder must govern possessions with restraint, justice, and dharmic responsibility.
No Vastu or ritual procedure is stated directly; the verse is descriptive, establishing the jewel’s exceptional status, which in broader Purana usage can motivate gifts, temple endowments, or royal patronage—but those are not specified here.