The airplanes of the heavenly denizens are bedecked with pearls, gold and many valuable jewels. The heavenly denizens are compared to clouds in the sky decorated with occasional flashes of electric lightning.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तारहेममहारत्नविमानशतसङ्कुलाम् । जुष्टां पुण्यजनस्त्रीभिर्यथा खं सतडिद्घनम्
tārahemamahāratnavimānaśatasaṅkulām | juṣṭāṃ puṇyajanastrībhiryathā khaṃ sataḍidghanam
SB 4.6.27