Nice Old Sock Darners Lot of 5 Wood Blue Iridescent Marbled Stone

I've always been fascinated by sock darners - just the variety and seeing my older relatives use them in WW2 times.  This is a good collection from estates including 3 wooden ones 2 natural and one black.  There are 2 unusual ones Egg shape - the first is marbleized looking stone and the other is a beautiful mystery - an iridescent blue gold some type of stone I believe.  Too heavy for glass but am not sure what it is, just lovely! Much more interesting in person than my pix. 3 wooden darners 5 1/2" 5 5/8" and 6" 2 Egg shape 2" and 2 1/8" approx. All nice vintage condition - black one has some marks on handle As arrived not cleaned polished