What is a twinning wisp?

The term “Twinning Wisp” on a GIA diamond grading report indicates the presence of inter-growth within the diamond crystal. A formation of twinning wisps within a diamond usually contain a variety of inclusions, such as diamond crystals, feathers (minute fractures) and clouds of pinpoint size diamond crystals.Click to see full answer. Thereof, do twinning wisps affect brilliance?They may look scary on an inclusion plot, but twinning wisps are often invisible to the naked eye and in many cases will have little to no impact on the brilliance of a diamond.One may also ask, what is a cloud in a diamond? A cloud is really just an area of microscopic inclusions within the diamond. These areas can be large or small, dense or sparse. Similarly one may ask, what is a feather in a diamond? Feathers are tiny cracks within a diamond and usually look like uneven, jagged lines or fissures. They can vary in size and can most easily be spotted with a 10x jewelry loupe, although they are not always visible from all angles. Feathers are flaws that most likely occurred in diamonds at the time of their formation.Are indented naturals bad?When they form small canyons or indentations, the cutter may choose to leave these characteristics instead of losing additional weight by removing them. An indented natural is more serious than a level natural since, like a cavity, it has a tendency to collect dirt and oil, acquiring a dark appearance.