Declension table of vajra

Neuter	Singular	Dual	Plural
Nominative	vajram	vajre	vajrāṇi
Vocative	vajra	vajre	vajrāṇi
Accusative	vajram	vajre	vajrāṇi
Instrumental	vajreṇa	vajrābhyām	vajraiḥ
Dative	vajrāya	vajrābhyām	vajrebhyaḥ
Ablative	vajrāt	vajrābhyām	vajrebhyaḥ
Genitive	vajrasya	vajrayoḥ	vajrāṇām
Locative	vajre	vajrayoḥ	vajreṣu

Compound vajra -

Adverb -vajram -vajrāt