Declension table of ?ratnapura

Neuter	Singular	Dual	Plural
Nominative	ratnapuram	ratnapure	ratnapurāṇi
Vocative	ratnapura	ratnapure	ratnapurāṇi
Accusative	ratnapuram	ratnapure	ratnapurāṇi
Instrumental	ratnapureṇa	ratnapurābhyām	ratnapuraiḥ
Dative	ratnapurāya	ratnapurābhyām	ratnapurebhyaḥ
Ablative	ratnapurāt	ratnapurābhyām	ratnapurebhyaḥ
Genitive	ratnapurasya	ratnapurayoḥ	ratnapurāṇām
Locative	ratnapure	ratnapurayoḥ	ratnapureṣu

Compound ratnapura -

Adverb -ratnapuram -ratnapurāt