Ujjvalanilamani 10.34

10.34

yathā-
magnā śubhre daśana-kiraṇe sphāṭikīva sphurantī
lagnā śoṇe kara-sarasije padmāragīva gauri |
gaṇḍopānte kuvalaya-rucā vaindra-nīlīva jātā
sūte ratna-traya-dhiyam asau paśya kṛṣṇasya vaṃśī //

As in:
"Submerged in the white radiance of His teeth, it gleams as if made of crystal;
held in His red lotus hand, O fair one, it appears as if of ruby;
near His cheek, by the luster of the blue water-lily, it turns as if of sapphire;
look, this flute of Kṛṣṇa produces the impression of three jewels!"