New Defender's Study Bible Notes
2:12 is good. The present tense in which this description is written indicates it to be an eyewitness account, and thus most likely a record originally from Adam himself. However, the past tense in Genesis 2:10 “went”) may suggest that, at the time when Adam actually wrote it, the garden of Eden was no longer there.
2:12 bdellium. The “bdellium” was evidently a precious gum, likened to the bread from heaven sent to the Israelites in the wilderness (Numbers 11:7).