Natyashastra
मरकतवैदूर्यादेः प्रदर्शनं सुमनसां च कर्तव्यम् । ग्राह्यं मरालपदमिति तज्ज्ञैरेव प्रयोगेषु ॥ ९०॥
This verse states that the Marālapada hand gesture should be used to represent emeralds, cat’s-eye gems, and other precious stones, as well as flowers. Experts in hand gestures (mudrās) should employ it accordingly in their performances.
english translation
marakatavaidUryAdeH pradarzanaM sumanasAM ca kartavyam । grAhyaM marAlapadamiti tajjJaireva prayogeSu ॥ 90॥
hk transliteration by Sanscript