They're from an unnamed experimental "range" produced for a short while during the development of Aurene.
Somewhere, in some recesses of IoWSG archives they do get called Seawood, that was never official, but an afterthought, I think from Elizabeth Harris.
It does appear in two different colourways, one with the more Mdina-like teal blue, the other in the inky blue of Aurene.
So they pre-date Aurene. And they're fabby!
This is a pic of Blue Aurene, Gold Aurene, Inky "Seawood" and teal "Seawood".