Osmium is both the densest and the rarest element that you can dig out of the Earth. It's so hard that it's used in places with constant pressure and wear, like the tips of fountain pens. One single cubic inch of this stuff weighs nearly a pound, and were you to somehow get a cubic foot of it, it would weigh over 1,400 pounds. Good luck with that, though: last year, the entire U.S. osmium production was only 165 pounds.
Rose quartz is a stone of the heart. A crystal of unconditional love. It dissolves emotional wounds, fears, & resentments. It reawakens the heart to its own innate love allowing one to truly give and receive love. Attracts new love, romance, intimacy, & closer bonds with family and friends.