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Diamond Transparency


Transparency is the degree to which a material transmits light, directly relevant to the cloudiness or haziness of the material.

Diamonds of any clarity, fluorescence and cut can in fact have varying degrees of transparency ranging form Poor to Excellent depending on how the light is returned and reflected or interrupted by the particular unique characteristics of the diamond.

Transparency, also called pellucidity, is the material property of allowing light to pass through. In mineralogy, another term for this property is diaphaneity. Diamonds with an Excellent transparency grade have a high light return and brilliance.

The DCLA has developed a Transparency Grade which ascertains the degree to which a diamond transmits light, directly relevant to its ‘cloudiness’ or ‘haziness.’ This transparency grade is a comprehensive assessment of light performance based on the quality of the diamond crystal.

 What Effects Diamond Transparency?
Diamond transparency can be affected in many ways. Certain types of diamond inclusions, such as clouds and twinning lines, structural phenomena such as graining, and even fluorescence can have an impact on a diamond’s ability to transmit light and its beauty.

That being said, diamonds of any clarity, fluorescence and cut grade can in fact have Very Good or Excellent Transparency, making them extremely attractive stones. For example, fluorescence can sometimes give a diamond a ‘milky’ appearance, especially when in sunlight…but this is not always the case. It is quite possible for a fluorescent diamond to have Very Good or even Excellent Transparency.

The unique DCLA Transparency Grading System now takes all of these features into account to provide an even more comprehensive assessment of your diamond.

 DCLA Diamond Transparency Scale
Excellent: Completely transparent, no light interruption, no haze or cloud.

Very Good: Transparent, minimal light interruption, very light haze or cloud, difficult to detect.

Good: Transparent, slight light interruption, slight visible haze or cloud, detectable.

Medium: Semi-Transparent, marked light interruption, moderate haze or cloud, easy to detect.

Poor: Semi-Transparent, very little light passes through, heavy haze or cloud.

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