Hāras tāraḥ here refers to a string of the most perfect pearls. Ūrmi means a ring for the finger. Instead of aghāreḥ (enemy of Agha) sometimes śaurer (son of Vasudeva) is seen. Bracelet and ring are in the singular to signify the class, but actually Kṛṣṇa wore many bracelets and rings. It is like saying “He possesses barley grain” when we actually mean “He possesses many barley grains.” By mentioning the class, there is the suggestion of the individual items. The rule is jātyākhyāyām ekasmin bahuvacanam anyatarasyām: the name of a class of objects is in the singular, and optionally in the plural (Pāṇini 1.2.58)