Looking for a second opinion on "Natural Aquamarine" with strong red UV fluorescence
Hi Friends
I’m currently vetting a stone for a potential purchase and wanted to tap into the collective expertise here. I’m a Gem stone sales and purchasing representative prepping for the **JCK Las Vegas** show, so I’m trying to move quickly on sourcing, but this particular piece has me hesitating.
The vendor is presenting this as a **Natural Aquamarine**, and in normal daylight, the color is a convincing, saturated steel-blue. However, upon doing my standard bench testing, it’s showing a **strong, vivid red fluorescence under long-wave UV (365nm)** (see attached photos for the side-by-side).
Typically, I’d expect a natural aqua to be inert or perhaps show a very faint yellow-green glow. The "blood red" reaction is giving me major red flags for **synthetic cobalt-doped spinel** or possibly even a rare cobalt-bearing natural spinel—though the latter seems unlikely given the size and price point.
I’ve done my homework online, and while I’ve read about rare vanadium-activated Nigerian aquas that can glow red, this reaction looks much more like the synthetic cobalt signature I've seen in the past. GIA is currently at a 4-week turnaround for certifications, which is too long to wait before JCK.
My questions for the experts here:
- Given this specific shade of red under UV, is there any chance this remains in the beryl family?
- Has anyone encountered a natural aquamarine with this level of fluorescence that didn't turn out to be synthetic spinel?
- Are there any quick field tests (Chelsea filter, etc.) you'd recommend I perform before I officially walk away from the deal?
I want to make sure I’m being thorough before I tell the vendor "no." I'd appreciate any insights from fellow dealers or gemologists who have handled similar material.
Thanks in advance!