Hello pvon, although I cannot compete with names mentioned by you or Dave, those grips you do mean are obviously the artificial amber grips (the grip-names you mentioned were only given by those who do not know about them). They come in variants. some of them have small metal(?) disks integrated, some other material, some without them, come in differend color shades. All to do the impression of amber.
I once did own a very nice from PACK, shown here.
Regards,

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wotan, gd.c-b#105

"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.