When shopping for a diamond in Australia, one of the less understood yet value-impacting characteristics is diamond fluorescence. But what does it mean—and how much does it really affect the price?
What Is Diamond Fluorescence?
Diamond fluorescence is the glow a diamond emits when exposed to UV light. The most common fluorescence color is blue, and the GIA grades it as: None, Faint, Medium, Strong, or Very Strong.
Fluorescence doesn’t affect a diamond’s hardness or durability, but it can influence both appearance and value—depending on the color grade and intensity.
How Fluorescence Affects Value: With Price Examples
To help illustrate, let’s compare a 1.00ct Round Brilliant, VS2 clarity, G color diamond from a reputable Australian retailer.
None Fluorescence
- Price: AUD $10,000
- Considered “premium” for higher color grades (D–G). No UV reaction keeps the diamond’s face-up color unaltered.
Faint Fluorescence
- Price: AUD $9,700 (~3% lower)
- No visible impact to most buyers. Slight discount due to market preference but still holds value well.
Medium Fluorescence
- Price: AUD $9,400 (~6% lower)
- May slightly enhance warmth in H–J color diamonds, making them appear whiter. Smart value choice for budget-conscious buyers.
Strong Fluorescence
- Price: AUD $8,800–$9,000 (~10–12% lower)
- Potential for a hazy or oily appearance in rare cases, but many look completely fine. Great for buyers prioritizing size or cut quality over branding.
Very Strong Fluorescence
- Price: AUD $8,500 (~15% lower)
- Often heavily discounted. Best suited for those who can inspect the diamond in person or rely on trusted evaluations.
Key Takeaways for Australian Buyers
- D–F Color Diamonds: Choose none or faint fluorescence to avoid value loss and any risk of haziness.
- G–J Color Diamonds: Medium to strong fluorescence can improve visual whiteness and offer significant savings.
- Always ask to view the diamond under UV or daylight, or request a fluorescence video.
Final Word
Diamond fluorescence doesn’t have to be a deal-breaker—in fact, when understood properly, it can be your secret weapon to getting a better deal. Whether you’re shopping online or in-store in Australia, a bit of UV insight could mean thousands in savings.
