the how and why of the treasure laden concrete slab. is it worth the effort?and why.?

a close friend who is blind wanted to make a memorial to his wife of 25yrs, when she died in 1993.he mixed and formed the slab,smoothed the top,wrote her name and date on it with his finger.this was in his basement music room where he spend most of his time.he went upstairs and gave his 12yr old son a bag of her jewelry and other momentous.with instructions to lightly place them on surface just enough to stay in place.that way he could run his hand over them and remember their times together.he instead pushed them down into it and smoothed the top back over then didn't tell dad till to late.i tryed vinegar & wire brush,20gal and 2months,went to strong acid works faster,but it an brush eats the gold. an arrowhead from where they lived and a minnie ball from a trip to gettysburg showed up.acid got them out without harm.when i gave them to him his face was ear to ear smile,he has bad heart,needs surgery.want to get rest for him if possable.it's not about money IS IT WORTH IT OR NOT& WHY?