What does SI stand for?

Slightly Included (second lowest quality of diamond)

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

Science, medicine, engineering, etc.

Other Resources:

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Simply Irresistible (song) Singapore Idol (Singapore TV show) Sippy International Sistema de Informação Sistema Informativo Site Inspection Site Investigation Situationist International (governing body of political dissidents circa 1968) Skill Identifier (US Army) Slave Illuminator		Slovenia (international code) Small Intestine Smithsonian Institution Smoothness Index Societatis Iesu, Latin for Society of Jesus, Jesuits (religious order) Society for India (Cornell University) Softice (debugger) Software Item Soil Investigation Solar Inertial

Samples in periodicals archive:

Very Very Slightly Included (VVS1-VVS2): There are very tiny flaws that are hard to see when looking under a 10x magnification.

What Determines the Price of Engagement Rings?

SI1 and SI2 which is slightly included and I1 and I2 and these are inclusions that are obvious.

Tired of Dull Jewelry Are You Settling for 2nd Best Diamonds Are the ...

Very Very Slightly Included (VVS1 and VVS2 ); Very Slightly Included (VS1 and VS2); Slightly Included (SI1 and SI2) and Included (I1,I2, and I3) are the other internationally recognised terms which feature on diamond grading certificates worldwide.

Glittering Prizes; BY the time you read this, the Business Manager ...