What Is A Twinning Wisp Diamond Inclusion?

by Ultimate Jewelry Guide
What Is A Twinning Wisp Diamond Inclusion?

A twinning wisp diamond inclusion is a type of inclusion in the crystal structure of diamonds. It occurs when tiny, needle-like crystals are formed by an external agent.

Twinning wisp diamond inclusions are often seen as cloudy or foggy areas within the gems and they can also appear to be curly or twisted. These types of inclusions typically occur on the outside of a diamond.

But they may sometimes be found near one side of a gemstone’s table facet. This is likely because it takes more energy for these needles to penetrate into the heart of a stone.

Does A Twinning Wisp Affect Diamond Brilliance?

A “twinning wisp” is a diamond inclusion that can be found in polished diamonds. Twinning wisps are created when the diamond’s crystal lattice structure forms with another diamond crystal adjacent to it, causing what looks like an extra line on one side of the stone as opposed to all around the girdle (the widest part of the diamond).

With every inclusion, there is always a risk that it may affect the diamond’s brilliance. But twinning wisps in particular are very difficult to detect with the naked eye and pose no threat when it comes to how much light can enter through them.

Twinning wisps have little effect on diamonds’ sparkle or fire because they do not contain any air or other impurities—it just looks like there’s another line on the surface of your diamond.

This type of inclusion is often found near flaws and fractures, so make sure to have any such inclusions looked at by an experienced GIA-trained gemologist to make sure they don’t pose a threat.

What Do Twinning Wisps Look Like?

When observed at high magnification, twinning wisps resemble black or white stripes.  They are usually very thin (about 0.02 mm), and can sometimes look like cotton candy streaks that run throughout the diamond stone.

So, are twinning wisps on a diamond bad or good? The answer is neither. Inclusion patterns, including twinning wisps, are merely characteristics of the diamond. 

Inclusions can be common for some diamonds but not others depending on how it was formed in the earth’s crust. However, there is no way to discern one type from another, and people often just judge an inclusion as bad or good based on personal preference.

The presence of twinning wisps does not necessarily mean the diamond is flawed; in fact, most diamonds with twinning wisps are cut into brilliant shapes to bring out their beauty. 

The only issue comes when this and other types of diamond inclusions are present on a diamond in large quantities, which can cause the diamond to appear cloudy. The severity of this cloudiness will determine if it is a grade issue for that diamond or just an aesthetic feature.

The Difference Between Cloud and Twinning Wisp Diamond Inclusions

Twinning wisps are very small, thin lines found on the surface of a diamond or below its surface. Cloud inclusions are small clusters of pinpoint crystals that form within the stone itself. A twinning wisp is typically caused by stress on the diamond’s crystal lattice structure.

Cloud inclusions are caused by other diamonds or debris that have entered the diamond’s crystal lattice structure. Cloud inclusions can also be caused during the cutting process when small pieces of dust enter into a diamond while it is being cut. A cloud inclusion will cause some sections within the stone to appear cloudy and opaque. This does not affect the diamond’s value as it only affects the stone’s appearance.

Twinning wisps do not affect a diamond’s beauty or its value. Cloud inclusions can have an impact on how beautiful and valuable a stone is, depending on its size and location within the gemstone.

Should I Buy A Diamond With A Twinning Wisp Inclusion?

Yes, you can purchase a diamond with a twinning wisp inclusion. Although you may not be looking for this type of inclusions, these are completely natural and do not affect the beauty or clarity of your diamond.

The only thing you should watch out for is the concentration of this type of diamond inclusion. If the twinning wisp inclusion appears in many places throughout your diamond, it may not be worth buying.

But if there is a lesser concentration of this type of diamond inclusion, you can feel comfortable knowing that it will have no impact on the beauty or clarity of your diamond.

Do consult with an expert before making a final decision.


As you’ve read, diamond inclusions are one of the many things that make diamonds unique. 

A twinning wisp is a thin, hair-like inclusion found in diamonds. Twinning wisp diamonds are available at every price point and can offer more value to your investment.

Just make sure you get a certified diamond and buy from a reputable retailer.

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