रत्नच्छायाव्यतिकरः
रत्न · छाया · व्यतिकर
रत्नानां छायाः
तत्पुरुष (genitive) — the lights of jewels — Mallinātha names them, the glow of a ruby and the rest
रत्नच्छायानां व्यतिकरः
तत्पुरुष (genitive) — the running together of those lights
तत्पुरुष. jewel-lights mixed into one another — Mallinātha glosses व्यतिकर as मिश्रण, a mingling, which is what a rainbow looks like
uncheckedMallinātha, Sañjīvinī“ratnacchāyānāṃ padmarāgādimaṇiprabhāṇāṃ vyatikaro miśraṇamiva”