From here, I found such a sentence:
This Gem won't cover hardware details...
Besides, I also found a book named:
I could not look up the meaning of "Gem".
What's its meaning in this context?
I have investigated and Robin seems to be right. The Gem is referring to a book called "Game Programming Gems" and in this case refers to a small but valuable piece of information of which there are more than one of in the book.
From the author of the article you quoted:
Intel replaced Gem with White paper here:
Gem is often used to mean "a small item of great value". As such it is often used to describe small pieces of factual information that are very useful. Generally it would be unseemly to refer to ones own work as such (I might call an answer on this site a gem, but to do so of one of my own would be boasting), but marketing requires one to make boastful claims of ones work.
This sense of gem could be used of a collection of such small items, as in Game Programming Gems, a series of books by someone from Intel, and so on.
Within the context of doing so, it would make sense to refer to each essay as a gem, even within the essay.
As such, "This Gem won't cover hardware details" would mean that particular essay won't cover hardware details. Out of context, it no longer makes sense.
So it's not jargon, it's marketing.
It is unclear what the intent of the author was. If the word is meant to be an acronym then it should be all caps as in 'GEM'. If the word is meant to refer to a brand name or object then 'Gem' is correct but as the word is not used elsewhere in the document, nor is any external reference made, and neither is 'Gem' a common computing term, we have to conclude that the author has mistyped the capital letter and meant to write 'gem'.
A gem is a small precious stone, it appears to be used here to imply that the following information is concise and valuable. A 'gem of wisdom'.
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