Opal Cracks Vs. Craze

Opals are widely known around the world as one of the rarest most stunning gems to be formed. They can be highly valued depending on the type of opal and its characteristics. The value can alter when determining if an opal has cracking or crazing. In this article, I will discuss the difference between what causes opal cracks and crazes and how to prepare them or prevent them.

 

What are Opal Cracks and Craze?

 

Opal fractures or fissures, known as opal cracks, can arise due to natural stress, extreme temperatures, or impact pressure. These cracks can be problematic as they diminish the opal's strength and enhance its susceptibility to breakage.

 

Opal craze is a series of minute cracks that materialize on the surface of the stone, creating a spider-web-like appearance that can sometimes be unnoticed without magnification. The emergence of opal craze can be attributed to multiple causes, including moisture or heat exposure and the natural aging of the stone.

 

What Causes Opal Cracks and Craze?

 

Opals are distinct gemstones that possess a significant amount of water, typically ranging from 3% to 21%. This high water content renders opals highly vulnerable to fluctuations in humidity and temperature. Any exposure to extreme temperatures or humidity changes can result in the evaporation or expansion of water within the opal, creating stress on the gemstone that can result in the formation of cracks and craze.

 

Aside from environmental factors, physical stress on the opal can also lead to the development of cracks and craze, such as impact or pressure. Additionally, the internal structure or the presence of other minerals in some opals may naturally increase their susceptibility to cracking.

 

How to Prevent and Repair Opal Cracks and Craze?

 

Opals are delicate gemstones that require proper care to avoid cracking and crazing. Here are some helpful tips:

 

• Keep your opals away from extreme temperatures, direct sunlight, and hot water.

• Store your opals in a safe and dry place, away from other jewelry that could damage them.

• Avoid wearing opals during activities that may cause physical stress on the gemstone, such as sports or manual labor.

• Clean your opals regularly using a soft cloth and mild soap and water.

 

If your opals develop cracks or craze, it is recommended to have them professionally repaired by an experienced gemstone specialist. However, severe damage may require replacing the stone.