A simple solid, there is nothing complicated about this classic cut gem design. But with its seven facets it serves as the "age stone" for a 7-year birthday party. Of course, seven is a special number being the number of days in a week, the number of celestial bodies (in classic astrology), the number of metals (in traditional alchemy), and so on.

As this was popular here I made additional versions, so 5-, 6-, 8-, and 9- year versions are now available.

This needs no raft and no supports. Scale it to whatever size you wish.