The Hardest Thing To Love A diamond is the hardest natural substance on Earth. It’s also the softest thing on my hand. A single stone, shaped like a heart, encased in a stylish gold ring. It ends with a slight wave, making space for the heart to rest, much like the chest cavity housing the heart in our bodies.  https://www.boloji.com/articles/55378/the-hardest-thing-to-love