Diamond Fluorescence Calculator

Calculate how fluorescence affects diamond pricing and find value opportunities based on color grade and fluorescence intensity.

Fluorescence Price Impact

See how fluorescence affects the price of your diamond.

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Fluorescence Savings Opportunity

Find how much you can save by choosing a fluorescent diamond.

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All Fluorescence Grades Compared

See the price at each fluorescence level for your diamond specs.

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Formula

Adjusted Price = Base Price × (1 + Fluorescence Adjustment %)
Adjustment ranges from -15% (strong fluor on D-F) to +3% (medium fluor on K-M)

Frequently Asked Questions

How does fluorescence affect diamond price?
For D-F color, strong fluorescence reduces price 10-15%. For G-H, impact is 0-5%. For I-M color, fluorescence can actually increase value by making the diamond appear whiter.
Is fluorescence good or bad?
Neither inherently. About 30% of diamonds fluoresce. In most cases it's invisible in normal light. For lower colors, blue fluorescence can enhance whiteness. Rarely, very strong fluorescence causes haziness.
Is fluorescence a good value opportunity?
Yes. G-H color with medium blue fluorescence may look whiter while costing 5-10% less. View the diamond in person to ensure no haziness before purchasing.

Understanding Diamond Fluorescence

Diamond fluorescence is the visible light some diamonds emit when exposed to ultraviolet (UV) light. About 25-35% of diamonds exhibit some degree of fluorescence, most commonly blue. GIA grades fluorescence as None, Faint, Medium, Strong, or Very Strong. The phenomenon is caused by submicroscopic features within the diamond's crystal structure.

The market traditionally discounts fluorescent diamonds, particularly in higher color grades (D-F). However, GIA's own research has shown that in most cases, fluorescence has no perceptible effect on a diamond's appearance in normal lighting conditions. This creates a value opportunity for informed buyers who can purchase beautiful diamonds at a discount.

For diamonds in the I-M color range, medium blue fluorescence can actually be beneficial -- the blue fluorescence counteracts the yellowish tint visible in these lower color grades, making the diamond appear whiter. This is one of the best-kept secrets in diamond buying and can save buyers 5-15% while getting a better-looking stone.

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