Declension table of ?puṃratna

Neuter	Singular	Dual	Plural
Nominative	puṃratnam	puṃratne	puṃratnāni
Vocative	puṃratna	puṃratne	puṃratnāni
Accusative	puṃratnam	puṃratne	puṃratnāni
Instrumental	puṃratnena	puṃratnābhyām	puṃratnaiḥ
Dative	puṃratnāya	puṃratnābhyām	puṃratnebhyaḥ
Ablative	puṃratnāt	puṃratnābhyām	puṃratnebhyaḥ
Genitive	puṃratnasya	puṃratnayoḥ	puṃratnānām
Locative	puṃratne	puṃratnayoḥ	puṃratneṣu

Compound puṃratna -

Adverb -puṃratnam -puṃratnāt