If you’ve ever been diamond shopping, you know that diamond transparency is an important factor to consider. But what does diamond transparency mean exactly? Let’s take a closer look at this topic and find out.



Diamond transparency is an important factor to consider when shopping for diamonds, as transparent diamonds are the most desirable since they allow the most light to pass through them, resulting in an intense sparkle that less transparent stones cannot match.

Diamond transparency measures the ability of light to pass through the diamond. It is the degree to which a diamond transmits light, directly relating to the cloudiness or haziness of its material. In diamond grading terms, diamond transparency is graded on a scale from "Transparent" to "Opaque."

From Poor to Excellent, diamonds of any cut, clarity, and fluorescence can have varying degrees of transparency based on how light is mirrored back or disturbed by the diamond's particular features. Diamonds with an Excellent grade for transparency are renowned for their luminosity and brilliance. 


Diamond transparency can be affected in many ways. For example, certain diamond inclusions, such as clouds and twinning lines, combined with other structural characteristics like graining and fluorescence can significantly change how a diamond reflects light - influencing its brilliance and beauty.

Inclusions in a diamond can make its transparency appear hazy and dull, blocking light from passing through the diamond's surface. In contrast, diamonds with fewer or no inclusions often have higher diamond transparency and can cost significantly more.

Diamond graining can also have a major impact on diamond transparency, as it interferes with a diamond's ability to reflect light. Graining is caused by incorrectly aligned diamond crystals, resulting in a wavy pattern that disturbs the diamond's internal structure. This disorganized diamond structure affects how light is reflected off of it and can diminish the transparency of a diamond.

Lastly, when diamond fluorescence is present, it causes diamond transparency to appear blurry or foggy. This is because the diamond absorbs a portion of the UV light that hits it and then re-emits this light in the form of visible light waves. This process creates a glowing effect on the diamond's surface that can blur out diamond transparency and reduce diamond sparkle.


The diamond transparency scale ranks diamond transparency from poor to excellent and is based on how light passes through the diamond and reflects off it.

Excellent: An excellent transparency grade diamond is the most desirable diamond, as it allows light to pass through it easily, resulting in an intense sparkle. An excellent transparency grade means a diamond is crystal clear and free from any foggy haze or cloudiness.

Very Good: A very good transparency grade means a diamond is quite clear with minimal haziness in the stone. The diamond is transparent, with small light interruptions and a very light amount of haze or cloudiness, which is difficult to detect.

Good: A good diamond transparency grade means a diamond is transparent, with small light interruptions and a faint visible fog, which is detectable.

Medium: A medium transparency grade means a diamond is semi-transparent, with marked light interruptions and a moderate level of haze or cloudiness that is easy to detect.

Poor: A poor transparency grade means a diamond is semi-transparent, while hardly any light permeates the thick haze and cloud.

Opaque: An opaque diamond transparency grade means that a diamond is completely impervious to light, resulting in no diamond sparkle and virtually zero transparency.


In conclusion, the transparency of a diamond is an important factor to consider when diamond shopping, as it plays a big role in the diamond's sparkle and beauty. Diamond transparency can be affected by diamond clarity features such as clouds and twinning lines, diamond graining, and diamond fluorescence. The diamond transparency scale goes from Poor to Excellent to help you determine the best diamond for your needs. Thanks for reading!