Your heart

[thewatson]

A diamond is your heart
That I wish to steal
A prized piece of art
It is guarded by an eel

I cut your chest apart
That jewel I must take
But next to the heart
Lies this wretched snake

I kill it and smash it in two
Nothing will keep me from you
But yet again I am mocked by fate
By the fangs of the wretched snake

Which have have bitten deep into your heart
Which I in vain attempt to restart
But cardiac arrest has settled in
Love will ever be my chagrin

I agree with the reply regarding the confusion between the snake and eel..
I think that, in the fourth line of the second stanza you changed the word "the" to "this", the symbolism would prevail itself better.
I feel like that would bring the eel in the first stanza and the snake in the second stanza together as one.. a symbolic being