Valmiki Ramayana Sundara Kanda Sarga 38 Shloka 70

ततः then, वीरः hero, अनुत्तमम् very great, मणिरत्नम् jewel, प्रतिगृह्य after taking, अङ्गुल्या on his finger, योजयामास placed अस्य to his, भुजः arm, न प्राभवत् हि was not fitting.

Then Hanuman, taking the extraordinary jewel and placed it on his finger as it was not fitting to his arm.