Caitanya-caritāmṛta 7.126
nānā ratna-rāśi haya cintāmaṇi haite tathāpiha maṇi rahe svarūpe avikṛte
[naanaa ratna-raashi haya chintaamani haite tathaapiha mani rahe svaroope avikrite]
Blended reading (Sanskrit + English inline)
nānā ratna-rāśi haya cintāmaṇi haite tathāpiha maṇi rahe svarūpe avikṛte
“Although a touchstone produces many varieties of valuable jewels, it nevertheless remains the same. It does not change its original form.
My note
Source: vedabase.io