The MoreGems Gem Show LIVE | Really Amazing Rings! 5/20/2020
Find all the stones for this week's show: https://www.moregems.com/collections/the-moregems-gem-show-5-20-2020-really-amazing-rings We're going live with gem cutter, Steve Moriarty! In this show, he will be showing you some outstanding rings, as well as a few beautiful gems. He will be showing & discussing rings and some gemstones , as well as, offering limited time discounts on these pieces. Not only that, but we'll be answering your questions from the live chat! Join us Wednesdays at 7:05PM CST (Chicago Time) for our Live Gem Show! 1:46:30 -- Rough Supplier for Cutters: Steve Ulatowski https://www.neweragems.com/ 1:48:25 -- Viewer Question answered by Chris Clemens (President of the Midwest Chapter of the Fluorescent Mineral Society https://www.uvminerals.org/) Why do some untreated sapphires fluoresce under UV light and others do not? Answer: "Regarding your question about the cause of variable fluorescence in sapphire, sorry I couldn't provide a more detailed explanation, but I couldn't type any faster on my tablet. Of course, the answer is not simple, but as a generalization, your initial response was correct- fluorescence in sapphire is most commonly a balance between activation by chromium (Cr+3) and quenching by iron (Fe+3). Both of these ions can substitute for Al (Al+3) in the crystal structure of corundum (Al2O3). In general, the more chromium and less iron, the brighter the red fluorescence; while more iron and less chromium leads to diminished or no fluorescence due to quenching. In some cases, however, iron (Fe+3) can also activate fluorescence in sapphire, but the emission is at and beyond the far red end of the visible spectrum, so iron is not as important an activator in sapphire as is trivalent chromium. To add another level of complexity, chromium itself can also act as a quencher of fluorescence, by a process called self-absorption, if chromium is present in the crystal structure above a certain percentage. Therefore, high chromium content sapphires may be poorly fluorescent, or not fluorescent at all. The same holds true for rubies also. The trace presence of other ions, such as titanium, nickel and vanadium, can also play roles as activators or quenchers of fluorescence in sapphire. As you know, the presence, or absence, of these various ions, including chromium, also affects the color of the corundum, and determines whether it is called sapphire or ruby. Hope this helps. Best regards, Chris" Watch our past LIVE shows here: https://www.youtube.com/playlist?list=PLwBsvcRI6nW8Xp-yj_6Dgk4uKPrTi9Y5w Shop our Gems & Jewelry Online: https://www.MoreGems.com https://www.TanzaniteJewelryDesigns.com https://www.MineralMike.com https://www.MothersFamilyRings.com
Find all the stones for this week's show: https://www.moregems.com/collections/the-moregems-gem-show-5-20-2020-really-amazing-rings We're going live with gem cutter, Steve Moriarty! In this show, he will be showing you some outstanding rings, as well as a few beautiful gems. He will be showing & discussing rings and some gemstones , as well as, offering limited time discounts on these pieces. Not only that, but we'll be answering your questions from the live chat! Join us Wednesdays at 7:05PM CST (Chicago Time) for our Live Gem Show! 1:46:30 -- Rough Supplier for Cutters: Steve Ulatowski https://www.neweragems.com/ 1:48:25 -- Viewer Question answered by Chris Clemens (President of the Midwest Chapter of the Fluorescent Mineral Society https://www.uvminerals.org/) Why do some untreated sapphires fluoresce under UV light and others do not? Answer: "Regarding your question about the cause of variable fluorescence in sapphire, sorry I couldn't provide a more detailed explanation, but I couldn't type any faster on my tablet. Of course, the answer is not simple, but as a generalization, your initial response was correct- fluorescence in sapphire is most commonly a balance between activation by chromium (Cr+3) and quenching by iron (Fe+3). Both of these ions can substitute for Al (Al+3) in the crystal structure of corundum (Al2O3). In general, the more chromium and less iron, the brighter the red fluorescence; while more iron and less chromium leads to diminished or no fluorescence due to quenching. In some cases, however, iron (Fe+3) can also activate fluorescence in sapphire, but the emission is at and beyond the far red end of the visible spectrum, so iron is not as important an activator in sapphire as is trivalent chromium. To add another level of complexity, chromium itself can also act as a quencher of fluorescence, by a process called self-absorption, if chromium is present in the crystal structure above a certain percentage. Therefore, high chromium content sapphires may be poorly fluorescent, or not fluorescent at all. The same holds true for rubies also. The trace presence of other ions, such as titanium, nickel and vanadium, can also play roles as activators or quenchers of fluorescence in sapphire. As you know, the presence, or absence, of these various ions, including chromium, also affects the color of the corundum, and determines whether it is called sapphire or ruby. Hope this helps. Best regards, Chris" Watch our past LIVE shows here: https://www.youtube.com/playlist?list=PLwBsvcRI6nW8Xp-yj_6Dgk4uKPrTi9Y5w Shop our Gems & Jewelry Online: https://www.MoreGems.com https://www.TanzaniteJewelryDesigns.com https://www.MineralMike.com https://www.MothersFamilyRings.com