Intrigued, I Googled "bird nest jewellery", and mostly it seems to
consist of pendants that actually look like birds' nests, with beads
in the middle to represent eggs - not what you were thinking of at
all, I imagine!
Then I found this: http://www.ganoksin.com/gnkurl/ep81qx
Seems to be a beading project as much as anything else, and looks a
bit messy to me (just my opinion!) but it appears to be a Byzantine
weave with large jump rings making a very open and - to my eye at
least - ungraceful chain, but then beauty is in the eye of the
So I guess the different mandrel sizes you have must simply be
mandrels for making jump rings of different sizes in order to make a
Byzantine chain-maille piece. or anything else you might use jump
Honestly can't see where "bird nest" comes into it at all!