GemologyOnline.com • View topic - cobalt spinel
Oct 23, 2007 · December 6-8—COSTA MESA, CALIFORNIA: Wholesale and retail show; Gem Faire Inc; OC Fair & Event Center, 88 Fair Dr; Fri. 12-6, Sat. 10-6, Sun. 10-5; $7 weekend pass; Fine jewelry, precious & semi-precious gemstones, millions of beads, crystals, gold & silver, pearls, minerals, fashion accessories & much more at manufacturer’s prices.
The Chelsea Filter - Gemology Online
That is because cobalt can cause the absorption of the green portion of the spectrum, while allowing transmission of the red. This was considered useful in helping to separate synthetic cobalt colored blue spinel, blue cobalt glass, or doublets which may be confused with sapphire in the mid 20th century.
Spinel - Gemology Online
Spinel is a favorite of gem dealers and gem collectors due to its brilliance, hardness and wide range of spectacular colors. In addition to beautiful rich reds, spinel can be found in a range of pastel shades including a spectacular vibrant hot pink with a …
GemologyOnline.com • View topic - Luc Yen cobalt blue spinel.
May 14, 2017 · I have a few crystals of cobalt bearing spinel from Luc Yen "area" of Vietnam. I have been watching this material for a couple years now. Pala had a great stone that Harriet snagged a while back. I was enamoured with that cut stone. I sidelit these stones under a 6100K light, so the blue pops slightly more in the pics than IRL.
GemologyOnline.com • View topic - How to ID synthetic spinel
Jan 26, 2007 · Another diagnostic I don't believe has been mentioned is the spectrum for blue FF syn spinel. Easily recognizable with it's 3 broad absorption bands. Natural blue spinel containing cobalt may be similar but the natural material is pretty rare. Below is a homemade effort of the synthetic absorption spectrum.
GemologyOnline.com • View topic - Cobalt Blue Spinel -URGENT ;) -
Jan 14, 2008 · HAPPY HOLIDAYS TO ALL! THE GEMOLOGY PROJECT is a free Gemological Encyclopedia that anyone can edit! JOIN NOW!
GemologyOnline.com • View topic - Cobalt Spinel
Nov 20, 2008 · May 3-5—SACRAMENTO, CALIFORNIA: Wholesale and retail show; Scottish Rite Center, 6151 H St; Fri. 12-6, Sat. 10-6, Sun. 10-5; Fine jewelry, precious & semi-precious ...
Heat Diffused Cobalt Blue Spinel? - GemologyOnline.com
Apr 17, 2008 · I know what you are saying. Curiously enough, I have a FF syn spinel, dark blue, that shows neither the expected fluorescence of natural or synthetic blue spinel. It definitely shows the typical cobalt absorption spectra for FF synthetic spinel. …
GemologyOnline.com • View topic - Heat Treating Tourmaline
May 14, 2019 · Post subject: Re: Luc Yen cobalt blue spinel. Posted: Mon May 06, 2019 10:55 am . Gemology Online Veteran:
GemologyOnline.com • View topic - Synthetic flame fusion spinel?
May 12, 2021 · According to Gemstonemagnetism.com some flame fusion spinels of a light blue color show a weak pink reaction to LWUV due to a low cobalt content. My stones have a strong pink reaction due to, as I understand, it either high cobalt content or chromium or a combination of the two. I don´t have a polariscope but I did make a 2 home versions.