For the heart, stomach or side it will heat up the flesh, making the sufferer better. If it is particularly bad, she suggest placing the Emerald in the sufferers mouth to wet it with his saliva which then heats up from the stone. Then place it on the area of the body in pain. Do this repeatedly. Although questionable in its application for Epilepsy, Hildegard says to “place the Emerald in the mouth of the victim whilst prostrate. It will revive his spirit. After he gets up and takes the stone from his mouth, he should look at it intently, and say, Just as the breath of the Lord filled the whole earth, so may his grace fill the house of my body, so that it can never be removed. He should do this in the morning for the next nine days and he will be cured”. For head pain hold it near the victim’s mouth so that he breathe on it and warm it, then rub it in that condition on his forehead and temples. Then put it in the mouth, holding it there for a short while, ’til better.
For eyesight problems, she suggests this stone, being fiery, hots up quickly so hold it up to the sun. Then dampen it with the saliva of the sufferer and quickly place it on the eyes. Do this often and the eyes will clear.
A hot stone, is also good for eyesight problems. Using wine put the Onyx into it and leave it to soak for 15 to 30 days. Remove the stone, and each night thereafter dampen the eyes with the wine. They will then become clear and healthy. For heart or side pain, again using wine, heat some wine in a metal container and hold the stone over the steaming wine. The sweat then from the stone will drop into the wine. Put the Onyx back into the wine and drink the wine immediately. Pain will disappear. For swift action in dealing with strong fevers, put Onyx in vinegar for 5 days. After removing the Onyx, use the vinegar in all food preparations. For depression, place an Onyx in your mouth.
Another hot stone, useful for a person who eats or drinks poison, St Hildegard says to grate a moderate amount of beryl into water and drink it, doing the same for 5 days once a day on an empty stomach. The poison will either foam through the mouth or leave the body through the posterior. It also has stress-reducing powers. She says that if a person carries Beryl with them and often looks at in their hand they will be passive in dealing with others.
Again, she recommends putting it in the mouth to dowse in the person’s saliva or breath. It can be used for any of the five senses. It is recommended for the calming of passion placing it on the loins to great effect. After sweating from an acute disease a suffer should soon after put the sardonyx on his finger as a ring and he will never be sick with that disease again.