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What does SI stand for?

SI stands for Slightly Included (second lowest quality of diamond)

This definition appears very frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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Other Resources:
We have 92 other meanings of SI in our Acronym Attic

Samples in periodicals archive:

They are categorized in different grades that come with symbols like aeF' for flawless, aeIF' for internally flawless and VVS1 for very very slightly included #1), among many others.