Diamond Inclusions Are Really Internal Diamond Flaws - but don't worry - virtually all diamonds have them !!!
Diamond inclusions are characteristics that occur inside a stone. They are usually called flaws, because their presence means the diamond is not perfect. Inclusions are like fingerprints in a way; in the way that there are virtually no perfect diamonds & virtually all have their own individual & distinct inclusions
Some inclusions affect a diamond's clarity, making it less brilliant because they interfere with light as it passes through the stone. Other types of diamond inclusions can make a gemstone vulnerable to shattering, while others have very little overall effect.
There are few perfect diamonds, and the ones that are perfect are quite expensive, so the diamonds we buy all have varying amounts of internal and external flaws.
Common Types of Diamond Inclusions
Crystals and Mineral Inclusions
Diamonds can have tiny crystals and minerals imbedded in them, even other diamonds. Many cannot be seen without magnification, but a large chunk or grouping of crystals that detracts from a diamond's appearance lowers its clarity grade, and its value. There are times that a small crystal can add character to a diamond. A diamond with a small garnet imbedded in it would be a great conversation piece; and perhaps a personal choice for someone whose birthstone is a garnet.
Example below - Garnet Crystal formed inside a Diamond
Example below - Internal Diamond Crytsallisation
Pinpoints are tiny light or dark crystals in diamonds that appear by themselves or in clusters. Larger clusters of minute pinpoints can create a hazy area in the diamond, called a cloud, which affects the diamond's clarity. While many small black carbon pinpoints can give he diamond an overall silvery appearance.
Example below - Carbon Spots
Example below - Cloudy Diamond (Fairly Extreme Example)
Example below - Cloudy Diamond (Subtle Example)
Example Below - Silver-Grey Diamond - The Silver Colour is created by thousands of microscopic carbon spots that are too small for the human eye to see individually (Poor Quality Example)
Silver Diamond (Very High Quality Example)
Feathers are cracks within the stone that resemble, well... feathers. Small feathers do not usually affect a diamond's durability unless they reach the surface on the top of the stone, a location that's prone to accidental blows.
Diamond cleavage is a straight crack with no feathering. A cleavage has the potential to split the diamond apart along its length if it is hit at the correct angle. Small cracks that are not visible when a diamond is viewed in a table-up (face up) position do not seriously affect clarity ratings.
Example - Cleavage (Strong Cleavage)
Girdle Fringes, Bearding
Girdle fringes, or bearding, are hair-like lines that can occur around the girdle during the cutting process. Minimal bearding is usually not a problem, but extensive fringing is often polished away or removed by recutting the diamond.
Example - Bearded Girdle on a Diamond
Grain Lines, Growth Lines
Grain lines are created by irregular crystallization that takes place when a diamond is formed. Colourless grain lines do not usually affect diamond clarity unless they are present in large masses. White or coloured grain lines can lower a diamond's clarity grade.
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