gemstone

The story

1. Old English · derived fromġimstān, ġymstān“gem; jewel; precious stone”
2. Middle English · derived fromgimstone
3. English todaygemstone

From Middle English gimstone, alteration (due to Middle English gemme) of earlier ȝimston, ȝimstan, from Old English ġimstān, ġymstān (“gem; jewel; precious stone”), equivalent to gem + stone. Compare Icelandic gimsteinn (“jewel; gem”), Faroese gimsteinur (“jewel, precious stone”).