[DF 8] On Gemstones and Carats

[Stripe]

Honestly, I know nothing about precious gemstones. Not really interested in them other than as treasure for role-playing games. Reading over Dungeon Fantasy 8 -- and I love DF 8! -- I wondered how many carats I should make an astounding, jaw-dropping gem of the size common in cinema and high-fantasy fiction, like the ones found in the hands an eyes of golden idles and such. For example, the statue's eye on the cover of the AD&D Player's Handbook or the red gem Abu tries to steal in Disney's Aladdin.

How many carats would a golf-ball-sized emerald, amethyst, ruby or diamond be? Google tells me golf balls are about 42.67 millimeters in diameter.

How about a truly-fantastic baseball-sized emerald, amethyst, ruby or diamond? Again, Google tells me they are 73–76 millimeters in diameter.

Thanks!