Why Do Lab Grown Diamonds Have Inclusions?

May 18, 2023

Diamonds

Why Do lab grown diamonds have inclusions?

A common question asked by customers is why lab grown diamonds, despite being superior in every aspect compared to mined diamonds, still have inclusions. In this article, we will explore the reasons behind these inclusions and discuss the common types found in lab grown diamonds.

Why do lab grown diamonds have inclusions?

Lab diamonds, same to natural diamonds, most of the times contain inclusions due to the intricate process of diamond formation. Despite advancements in technology, achieving a flawless diamond remains very challenging, as numerous factors need to be perfectly aligned during the process. These factors include a constant and even amount in temperature, pressure, and carbon crystallization.

The diamond formation process can very rarely be 100% perfect, as even a slight change in pressure, temperature, or carbon crystallization speed can lead to inclusions. To form a diamond, several factors must occur simultaneously, such as the precise amounts of heat and pressure necessary to form a carbon crystal that will eventually become a diamond. Additionally, crystals must bond together in a specific manner. Consequently, obtaining a flawless diamond is a rare occurrence.

Interestingly, lab grown diamonds tend to have fewer flawless specimens compared to natural diamonds. When manufacturers succeed in creating a flawless lab diamond, it is often sold to the laser industry. Flawless diamonds are in high demand there, as they are essential for meeting the technological requirements necessary for lasers to perform according to specifications.

Is there a significant price difference between flawless and near-flawless lab diamonds?

Yes, there is a significant price difference between internally flawless (IF) diamonds and those with very, very slight inclusions (VVS-1). As experienced gemmologists, we recommend customers opt for VVS-1 diamonds over IF diamonds. However if budget allows it and you want to spoil yourself or your loved one. Getting a D/IF Diamond will certainly do the trick.

What are the common inclusions in lab diamonds?

Before listing the types of inclusions, we must first go over two things to provide context. Lab created diamond inclusions can vary depending on the method used to create the diamond. The two main methods are High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD).

Inclusions in HPHT diamonds:

HPHT diamonds often have metallic looking inclusions, which are darker in appearance. These inclusions occur when a small piece of metal minerals from the diamond`s surroundings becomes incorporated into the diamond during the formation process. Essentially the piece of metal gets stuck in the diamonds while its forming and the diamond just encapsulates it, locking the inclusion in place, while continuing to grow. There are other types of inclusion unique to HPHT, but by far the most common are the metallic looking ones.

Inclusions in CVD diamonds:

Diamonds formed using the Chemical Vapor Deposition (CVD) process does not require metals to be present around it while its grown. CVD diamonds typically have inclusions that are white or greyish in colour. These inclusions occur when the carbon crystallization process is disrupted by even the slightest changes in pressure or temperature, resulting in semi-crystallized carbon within the diamond.

For diamonds with a clarity grade of SI1 or higher (eye clean), the type of inclusion (HPHT or CVD) is not a significant concern, as these inclusions are not visible to the naked eye. The sole exception is with Emerald Cut diamonds, which greatly benefit from higher clarity and white or grey inclusions. This is because the Emerald Cut is more transparent and almost see-through compared to other cuts, making inclusions more noticeable.

What are other types of inclusions found in lab created diamonds?

One inclusion unique to lab created diamonds is the cloud inclusion, which is rarely found in natural diamonds. Cloud inclusions appear as dotted circles on diamond certificates and might seem concerning at first glance. However, the dotted circle merely represents the location and circular shape of the cloud inclusion. Cloud inclusions are simply areas of porosity caused by tiny pockets of emptiness within the diamond. It is important to note that the emptiness does not refer to the space being filled with air as diamonds are formed in the absence of oxygen.

Fortunately, these transparent cloud inclusions are not visible to the naked eye and do not impact the diamond`s appearance. Among the various inclusions, cloud inclusions are the least problematic and are included in the report for the sake of clarity and thoroughness. Experts require high-powered microscopes to differentiate cloud inclusions from the surrounding diamond, as they are transparent.

Why do lab diamonds have less surface reaching inclusions?

Another advantage of man made diamonds is the absence of surface-reaching inclusions, which are more common in natural diamonds due to their formation and polishing processes. Surface-reaching inclusions often occur in natural diamonds when polishers try to avoid removing too much weight from the diamond, leaving part of the rough diamond exposed. However, man made diamonds almost never have surface-reaching inclusions, as they provide more material for cutters and polishers to work with. This allows them to focus on quality rather than maximizing rough diamond utilization at the expense of quality or risking the exposure of surface-reaching inclusions on the final diamond, making lab grown diamond rings a more desirable option. Laboratories like IGI and GIA clearly mark surface-reaching, or external, inclusions in green, while internal inclusions in red, allowing consumers to easily know the difference.

Lab grown diamonds offer an ethical and environmentally friendly alternative to natural diamonds. While they may still have inclusions, just like mined diamonds, these factors do not significantly impact the diamond`s overall appearance. By understanding the common inclusions in lab grown diamonds and making informed decisions, customers can confidently choose a beautiful, ethical diamond that meets their needs and values.

In summary

Lab grown diamonds same as mined diamonds have inclusions most of the times, to find an internally flawless diamonds is very rare and they cost significantly more. When buying a lab or natural diamonds it is recommended to buy one which has no inclusions visible to the naked eye.