What Causes Crystals to Be Cloudy?

Inclusions

• Inclusions are the main cause of cloudiness in a crystal. Inclusions are defects that occur within the structure during formation. Sometimes the inclusions consist of smaller crystals or other sediments that get trapped within the larger crystal structure, thus creating a more hazy appearance. When a crystal has a large number of inclusions, less light can pass through it thus making it prone to a dull appearance when exposed to light. Inclusions may also increase the likelihood of fractures occurring at the inclusion point.

Blemishes

• Blemishes on the surface of the stone can also add to the cloudy appearance of a crystal. Pits or scratches on the exterior of the stone can tarnish the look of the stone and decrease brilliance. The color of a stone may also affect how opaque or transparent a stone is. For example, malachite is an opaquely colored crystal, while tourmaline generally tends to have more brilliance.

Flourescence

• Many gemologists also believe that a cloudy appearance in a crystal could be attributable to the fluorescence grade. A high fluorescence grade indicates that a crystal has a high level of cloudiness, while the reverse is true for low fluorescence grade crystals. Fluorescence is graded by exposing the crystal to an ultraviolet light source, and grading the color that appears during exposure.

Beauty

• There are many causes for cloudiness within a crystal. In some cases the cloudiness may actually be desirable characteristic that lends to the beauty of the crystal. These imperfect crystals can be put on display or be used to create rustic jewelry items.