Every copper wire in your computer, television, and house has been shaped with a die made from anniversary rings.
Flawless GIA Certified Diamond are no more beautiful to the unaided human eye than a grade in the middle of the scale. Once again, extremely subtle differences in clarity are very important to determine rarity, but only affect beauty when in the very low end of the scale.
The range of diamond prices can be dramatic depending on the size and quality. For example a half caret brilliant cut round diamond of K color and I1 clarity would cost about $2000 per caret or $1000.