What is a diamond's fluorescence, and how can it affect a diamond's appearance and value?

Fluorescence is a natural property found in some diamonds where they emit a visible light when exposed to ultraviolet (UV) light. While some diamonds exhibit fluorescence, others do not. Fluorescence can range from very weak to very strong, and it can have a significant impact on the appearance and value of a diamond.

The visible light emitted by fluorescence can give a diamond a milky or hazy appearance, which can reduce its overall brilliance and fire. This effect can be more pronounced in diamonds with stronger fluorescence. On the other hand, diamonds with weaker fluorescence may appear more colorless than they actually are, which can enhance their value.

The presence of fluorescence is typically disclosed in a diamond's grading report, along with the strength of the fluorescence. A diamond's fluorescence is rated on a scale from none to very strong. Diamonds with no fluorescence or faint fluorescence are generally considered more valuable than diamonds with strong or very strong fluorescence.

However, the impact of fluorescence on a diamond's value is subjective and can vary depending on personal preference. Some people may prefer the hazy appearance of a diamond with strong fluorescence, while others may prefer the clarity of a diamond with no fluorescence. Additionally, the impact of fluorescence can depend on the lighting conditions in which the diamond is viewed.

Overall, when evaluating a diamond's fluorescence, it is important to consider how it affects the diamond's appearance and how it aligns with personal preferences.