Off the top of my head:
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Green calcite, and rose quartz
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Hawthorn has a herbal medicine effect
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Copper used as in crystal healing with pure copper underneath the heart (laid on the chest wall outside, and below where his heart is nearer the abdomen)
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This old classic: Raphael mantra - success story - the heart’s easy to visualise
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Shamanic journeying to his heart (you journey to the person and enter them, it will probably look a bit like being inside the Statue of Liberty if it was made of glass, and you walked around inside) and ask it what it needs, remember doctors play the numbers and are groping in the dark trying to find the most likely causes and then apply the most widely-accepted solutions, but you can ask his heart itself.