Sgian Dubhs, what is appropriate?

[California Highlander]

A sgian dubh is a knife - 'black knife' - its only purpose was for killing someone. It does not matter what it looks like, Its purpose was to kill. There is no such thing as a 'dress' sgian dubh. if you want to kill someone, you do not possess a variety of knives to kill according to occasion.

Oh, the shark, babe, has such teeth, dear
And it shows them pearly white
Just a sgian dubh, has old MacHeath, babe?
And he keeps it out of sight
You know when that shark bites with his teeth, babe
Scarlet billows start to spread
Fancy gloves, though wears old MacHeath, babe
So there's never, never a trace of red
On a sidewalk, blue Sunday mornin'
Lies a body just oozin' life
Some, someone's sneakin' 'round a corner
could that someone be Old Mack the Knife?

So its original purpose did suit old Macky, but nowadays the sgian dubh seems either decoration (like jewelry for the hose) or a tool (like a Scandinavian knife). I prefer a workable knife that I can use to cut cheese and salami or a piece of rope while camping. But I wouldn't turn away a pretty sgian wit sterling fittings that I could use for evening attire.