Etymon
gem-under-protowest-germanic-undar-old-english-under-middle-english-under-english-under-protoindoeuropean-h2eg-protoindoeuropean-eti-protoindoeuropean-h2egeti-protoitalic-ago-latin-ago-protoindoeuropean-wos-protoindoeuropean-ihwosder
A dedicated page for this root is on the way — it will gather every word descended from it, sibling forms across daughter languages, and a branching map of the family tree.