Manusmriti
तैजसानां मणीनां च सर्वस्याश्ममयस्य च । भस्मनाऽद्भिर्मृदा चैव शुद्धिरुक्ता मनीषिभिः ॥ १११ ॥
The wise ordain that all (objects) made of metal, gems, and anything made of stone are to be cleansed with ashes, earth, and water.
english translation
taijasAnAM maNInAM ca sarvasyAzmamayasya ca । bhasmanA'dbhirmRdA caiva zuddhiruktA manISibhiH ॥ 111 ॥
hk transliteration by Sanscript