Gim-wyrhta

According to the Old English Dictionary:

an;

gim-wyrhta

m. A worker in gems, jeweller :-- Ðás gymwyrhtan secgaþ ðæt hí nǽfre swá deórwurþe gymstánas ne gemétton the jewellers say that they never met with such precious jewels, Homl. Th. i. 64, 9. gim-wyrhta