Correct way to get Specific Gravity - Gem Related Discussion - IGS Forums I keep asking myself “is it just me?” or what the heck am I doing wrong? I posted some time ago about purchasing several hundred gemstones from a coin dealer who was buying jewelry for the metal and basically ripping out the stones with whatever was handy Thank goodness only a handful of the gemstones were damaged and I was able to get the rest for a song… not once, but twice! Now, I
Seeking Skilled Faceters for Sphene Emerald (Tampa Bay Area) Hello IGS Community, I’m looking to connect with professional gem faceters based in the Tampa Bay region who specialize in cutting sphene (titanite) 🌟 About the Rough Stones Sphene (titanite) — vibrant, facet-grade rough
Alexandrite testing - Gem Related Discussion - IGS Forums Hi Julie, The IGS Refractive Index list indicates Spinel can also have a R I = 1 74; therefore, it cannot be ruled out at this point The PRI-M from Presidium is an interesting instrument It can measure the indicated R I of a stone But it has some limitations as it is difficult to measure the birefringence optical sign response
Painite synthetics - Gem Related Discussion - IGS Forums As for synthetic painites, I haven’t found any documented references to lab-created painites It’s unlikely there is enough demand for painites from gem consumers to make it economically viable for anyone to try to grow painites in a lab Pedro IGS Admin 3 Likes AmenaC47957 December 29, 2024, 1:19pm 3
Emerald Colours - Gem Related Discussion - IGS Forums I’m sorting through an old Ex Jewellers collection of Zambian stones and I’m coming across the odd one that is much more blue than green See the stone 3rd from left on second row Is this still considered an emerald? The largest stone in the image is 92 cts When is an emerald not an emerald? Many thanks for your kind knowledge
ID gemstone from Pendant - Gem Related Discussion - IGS Forums I bought a pendant with 18kt gold and a 9ct unknown greenish yellow gemstone refractive index is 1 639 -1 649, by rotatin the polarised lens, it doesn’t move On the UV light it goes green and there is a small inclusion i got under the microscope I am between tourmaline and topaz but none of them respond like that under UV light Thanks!