looking for functioning sgian dubh with clan crest

[Jock Scot]

hi im loking for a sgian dubh with a functional blade that can be customized with a clan bage and/or a jewl top like the cheeper ones. if know where i can get one let me know. thanks

You are quite correct cheeper SD's often have a "jewel top" which is often glass or, I am told, coloured plastic. But be careful, some of the very best and often expensive SD's, antiques mainly, have a real chunk of Cairngorm (smokey quartz) at the top.