Declension table of ?siddhāntaratna

Neuter	Singular	Dual	Plural
Nominative	siddhāntaratnam	siddhāntaratne	siddhāntaratnāni
Vocative	siddhāntaratna	siddhāntaratne	siddhāntaratnāni
Accusative	siddhāntaratnam	siddhāntaratne	siddhāntaratnāni
Instrumental	siddhāntaratnena	siddhāntaratnābhyām	siddhāntaratnaiḥ
Dative	siddhāntaratnāya	siddhāntaratnābhyām	siddhāntaratnebhyaḥ
Ablative	siddhāntaratnāt	siddhāntaratnābhyām	siddhāntaratnebhyaḥ
Genitive	siddhāntaratnasya	siddhāntaratnayoḥ	siddhāntaratnānām
Locative	siddhāntaratne	siddhāntaratnayoḥ	siddhāntaratneṣu

Compound siddhāntaratna -

Adverb -siddhāntaratnam -siddhāntaratnāt