Magic Forums

So I've read numerous sources on the topic of Craft Tools, but I've noticed that the descriptions and definitions for Wands and Atheme's are almost identical in regards to use and purpose during rituals, with the only real difference being the basic design or build of the tools themselves and/or personal practitioner's preference.
Which leaves me begging the question- what's the difference really and why aren't they ever associated together or as interchangeable in the plethora of writings out there on the subject?! (ie. cauldron/chalice)
Btw I kno that an atheme is specifically a double edged blade tool while the wand is usu. wood based w/stones, feathers, ribbons etc.