For the first 2 I believe the lack of a crown on such “clean” items indicates they are not royal navy; that's just my opinion.
1 = Merchant Navy Officer (possibly waistcoat button or collar stud) generic
2 = Merchant Navy Officer generic type
3 (Crown, Lion + Globe) = Cunard Line Ship’s Officer badge (1879? to 1900+) Crown permitted as company ran Royal Mail Ships.