The story
- Proto-Indo-European*h₂ékʷeh₂
- Proto-Italic*akʷā
- Latinaqua
- Proto-Indo-European*mer-?
- Proto-Indo-European*móri
- Proto-Italic*mari
- Latinmare
- Latinmarīnus
- Latinaqua marīna
- English todayaquamarine
From Latin aqua marīna (“sea water”), adjective form from mare (“sea”).
Etymology from Wiktionary, CC BY-SA 4.0.