Which term is associated with the emission of visible light under ultraviolet exposure?

Which term is associated with the emission of visible light under ultraviolet exposure?

• A. Fluorescence
• B. Finish
• C. Girdle thickness
• D. Four-point diamond

Answer: (A)

Fluorescence is the emission of visible light by a diamond when it’s exposed to ultraviolet light. Some diamonds contain trace elements that absorb UV energy and re-emit part of it as visible light, causing a glow under UV lamps. This property is a standard term in diamond grading and can vary from none to strong, most often appearing blue. The other terms describe different aspects: finish refers to surface polish quality, girdle thickness to the width of the diamond’s outer edge, and a four-point diamond relates to other characteristics not about light emission. So the emission of visible light under ultraviolet exposure is fluorescence.

Fluorescence is the emission of visible light by a diamond when it’s exposed to ultraviolet light. Some diamonds contain trace elements that absorb UV energy and re-emit part of it as visible light, causing a glow under UV lamps. This property is a standard term in diamond grading and can vary from none to strong, most often appearing blue. The other terms describe different aspects: finish refers to surface polish quality, girdle thickness to the width of the diamond’s outer edge, and a four-point diamond relates to other characteristics not about light emission. So the emission of visible light under ultraviolet exposure is fluorescence.