2016年4月28日星期四

GIA Clarity - SI1 with diamond photo

Below are diamond photo with SI1 clarity. Selection criteria are below:
Certificate: GIA
Carat weight: 1-1.99ct
Color: D-H color
Cutting and symmetry: Excellent
Fluorescence: None to Faint
Milky: None


Crystal is common in SI1.
Crystal can be black, white or colorless



Twinning Wisp is also common in SI1
I found twinning wisp has many expression. Below are better one as it expresses in thin white lines.
Some people will not consider the stone because there are many twinning wisps on the GIA plotting. However, if you see this stone with loupe, twinning wisps are not easily seen.



What is cloud?
It is a group of small crystals or pinpoints. GIA uses a dotted line to circle that area.
Some people afraid of cloud inclusion as they think it will affect the diamond fire and make the diamond look cloudy.
It is better to check the location, size and the density of the cloud before make judgement. Usually it neither affect diamond fire nor make the diamond cloudy. Rarely it does.




This is another common case that people will miss a nice stone when they buy diamond only using certificate for reference. This twinning wisp on the GIA plotting will scare some people. However, the twinning wisp in this diamond are not easily seen even in this magnified diamond photo.




That's why I say twinning wisp can have many expression. Twinning wisp below shows black color.