Check the site or contact us for the current position, because this is exactly the kind of thing that changes and a stale answer on a help page is worse than no answer. Our contact page reaches the warehouse directly and we will tell you straight away.
Payment and store-credit facilities depend on the platform and the payment provider in use, and both can change. Writing a definitive yes or no into a page that is rebuilt occasionally is how sites end up misleading people.
Ask us and you get the current answer.
A knife bought outright is usually a better gift than a voucher anyway, because the point of a knife as a gift is the choosing. See is a pocket knife a good gift for how to pick one.
If you are worried about getting the choice wrong, check our refund and returns terms before ordering so you know where you stand.
Gift returns follow the same policy as any other return, and the policy page is the controlling version. See returning an item bought as a gift.
Keep the order number: it makes any gift return far simpler for the recipient.