A food pyramid for dragon nutrition for the Ponies after People Universe

According to Gemstones of the World by Walter Schumann, there are 200 types of gemstones in the world.  As humans should eat a variety of foods for a healthy diet, perhaps dragons should eat a variety of gemstones to keep themselves healthy.  Perhaps, some gemstones are better at building dragon bones, while others are better for creating dragon blood and muscle.  Still other gemstones could act as dragon sexual stimulant foods.  As there is a food pyramid for human nutrition, someone could make a food pyramid for dragon nutrition.