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.
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.
See other definitions of SI
We have 92 other meanings of SI in our Acronym Attic
- 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
Samples in periodicals archive:
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.