Valmiki Ramayana Kishkindha Kanda Sarga 23 Shloka 10
Original Shlokaअश्मसारमयं नूनमिदं मे हृदयं दृढम्4.23.10।। भर्तारं निहतं दृष्ट्वा यन्नाद्य शतधा कृतम्।
1 source checked for this shloka
निहतम् killed, भर्तारम् husband, दृष्ट्वा seeing, यत् since, अद्य now, शतधा into a hundred, न कृतम् not broken, मे my, दृढम् hard, इदं हृदयम् this heart, अश्मसारमयम् made of stone, नूनम् surely.
'My heart is surely made of hard stone yet it has not split into a hundred pieces even on seeing my husband slain৷৷