Bright White Diamonds, 9ct White Gold earstuds. The above matched pair of brilliant cut Diamonds are of fine G colour white. In clarity they have been classified as SI 1. The clarity gradings of Diamond, after the extremely rare Flawless of no inclusions whatsoever, are VVS, VS and SI: VVS = Very Very Small inclusions; VS = Very Small inclusions; SI = Small inclusions. Each of these three clarity classifications is separated into a 1 and a 2.
The classification SI indicates that, with extremely good eyesight and a degree of concentration, there is a possibility of discerning, with the naked eye, the inclusions that the expert, with the aid of magnification, knows are present. The classification SI 1 of the above Diamond gemstones simply means that that naked eye of excellent vision is that much less likely to see any inclusions at all, no matter the effort and concentration.