Ratna-parīkṣā: Vajra (Diamond/Thunderbolt) — Origin, Types, Testing, Defects, Weights, and Royal Auspiciousness
वज्रैर्वज्रं विलिखति नान्येन विलिख्यते वज्रम् / वज्राणि मुक्तामणयो ये च केचन जातयः
vajrairvajraṃ vilikhati nānyena vilikhyate vajram / vajrāṇi muktāmaṇayo ye ca kecana jātayaḥ
A diamond is scratched only by diamonds; nothing else can scratch a diamond. Diamonds, pearls, and other such gems belong to that class of hard and precious substances.
Lord Vishnu
Concept: Only like (or superior within the same class) can transform like—an implicit principle of comparable potency.
Vedantic Theme: Sāmānya-viśeṣa reasoning (general/specific) and the notion of śakti (capacity) determining effect.
Application: For difficult problems, apply tools of equal caliber; invest in appropriate instruments and peer-level mentorship for ‘hard’ tasks.
Primary Rasa: shanta
Secondary Rasa: adbhuta
Related Themes: Garuda Purana 1.68: continuity of vajra-guṇa and ratna-jāti classification
It teaches discernment: certain things can be affected only by their own kind—strength meets strength—so one should understand the true means required for a given task or transformation.
It uses a concrete, worldly example (gemstones and hardness) to communicate a principle of right understanding and appropriate means, a common didactic method in the Purana’s instruction.
Choose the right remedy for the right problem: cultivate matching qualities (discipline for discipline, knowledge for ignorance), and seek competent guidance rather than ineffective substitutes.