Searu-gim[m]

According to the Old English Dictionary:

es;

searu-gim[m]

m. A curious gem, precious stone:--Seærogim topazion, Ps. Spl. T. 118, 127. His égan scinan swá searagyrn, Nar. 43, 15. Searogemme unio, Wrt. Voc. ii. 89, 34. Meregrota oððe gymmas (saragimmas, MS. V.) margaritae, Nar. 37, 29. Stán, searo-gimma nán (ǽlces cynnes gimmas ne . . ., Bt. 34, 8; Fox 144. 31), Met. 21, 21: Beo. Th. 2318; B. 1157. Ðæt ic ǽrwelan, goldǽht ongite, gearo sceáwige sigel, searogimmas (the dragon's hoard), 5491; B. 2749: Exon. Th. 478, 5; Ruin. 36. searu-gimm