Strain in diamonds is also known as stress and occurs in around 40% diamonds. It is actually a distorted crystal growth in the diamond. Strains are more commonly present in Pear, Marquise & Triangle shape cut diamonds as compared to brilliant round cut diamonds.

Before a diamond is cut, cutters analyze the color, location & amount of strain in it. Diamond can survive the whole cutting and polishing process then it will also survive the normal wear & tear despite the presence of strain. There isn’t anything major to be concerned about- as strains in diamonds are normal.

Observing strain in diamond is quite difficult. A strain is not easily visible to naked eye and not even under a loupe or microscope. Strain can only be examined with crossed Polaroid lenses under magnification view.

On the basis of color, location & amount of strain; the price and preciousness of diamond is decided. It is ascertained that the diamond containing a strain does not sell for the same price compared to the one which does not have a strain. Streaky pattern because of strain is more commonly seen in brown crystals. Presumably, brown diamonds produce strain in their crystals due to receipt of anisotropic force under the ground.

The picture on top of post has been taken under a polarizing filter, the grain lines are clearly seen in the crown. The internal strain in the bottom of the stone is also visible in this picture.

The best, most beautiful diamonds in the clarity category will be the ones with the least amount of inclusions. Diamonds are graded and identified uniquely according to the type and number of inclusions present in them. The higher clarity graded diamonds are most sought after & therefore highly priced.