"gems of knowledge" is correct and usable in written English. You can use it when you want to refer to useful and valuable pieces of wisdom or information. For example: My grandmother always shared her gems of knowledge with me when I was a child.
The guys from NimbleBit (developers of Tiny Tower, the game handpicked by Apple as iOS Game Of The Year) are on a bit of a tweeting spree tonight, blasting out two big ol' gems of knowledge in as many hours.
But any who take the leap may use their worldliness to good advantage, smuggling gems of empirical knowledge across the literary border to create fiction with unusually rewarding heft.
When in conversation, I drop these gems of newfound knowledge persistently.
I'm not talking strictly about the learning that goes on in a classroom either — here are a few 'gems of knowledge' that I've picked up along the way 1.
It pulled together a lifetime of knowledge about gems and minerals and took about 10 years to assemble, said his daughter Sharon Tooley of San Diego.
All told, it's a touch too grandiose, but littered with gems of hard-won self-knowledge.
She seamlessly incorporates personal experiences, useful gems of wisdom, and detailed technical knowledge of the practice.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.
Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com