Good analogy there Cesare on the 'love children' for those of us who remember the blur of the 60s purple haze and all
On the sinister side, I wonder if possibly that this dagger may be a misericorde, and the symbolism may reflect a different, yet benovolent, aspect of Christian love, that of mercy.
While the fish is of course well known as a Christian symbol, the dolphin is often perceived in Christian art as a guide to lead souls into paradise and represents resurrection and salvation.
In the codes of chivalry, the dispatch of the fallen was not necessarily an act of vengeance or hatred, and carrying out this naturally unpleasant, although merciful act certainly must have weighed heavily on the conscience of the man faced with this duty.
On the other hand, the dagger may well be as it seems, and with the ring, being intended for more amorous and far more pleasant pursuits. Maybe it is a wedding dagger. The dolphins representation of love and benevolence is widely interpreted.
Michael, would you mind restating notes on the mark?
best regards,
Jim