Shiva Purana
स वै मणिः कौस्तुभवद्द्योतमानोर्कसन्निभः ॥ ध्यातो दृष्टः श्रुतो वापि मंगलं यच्छति ध्रुवम् ॥ ६ ॥
The jewel was as brilliant as the sun. It shone like Kaustubha. It blessed auspiciously when meditated upon, heard of or sighted.
english translation
sa vai maNiH kaustubhavaddyotamAnorkasannibhaH ॥ dhyAto dRSTaH zruto vApi maMgalaM yacchati dhruvam ॥ 6 ॥
hk transliteration by Sanscript