यस्य कान्तिलवस्पृष्टं कांस्यं ताम्रमयस्त्रपु ।
पाषाणादिकमन्यद्वा सर्वं भवति काञ्चनम् ॥
चिन्तामणिः स विज्ञेयो मुनिभिः सिद्धसाधनः ।
yasya kānti-lava-spṛṣṭaṁ kāṁsyaṁ tāmra-mayas trapu |
pāṣāṇādikam anyad vā sarvaṁ bhavati kāñcanam ||
cintāmaṇiḥ sa vijñeyo munibhiḥ siddha-sādhanaḥ |
(Skanda Purāṇa: Brahmottara-khaṇḍa)
“The effective means by the minute touch of the luster of which bell metal, copper, tin, stone, and so forth, as well as all else, becomes gold is known as a cintāmaṇi [lit., ‘thought-jewel’] by the sages.”