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Bookmark or Share- Alexandrite testing - Gem Related Discussion - IGS ForumsThe 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.
- Is IGS's Gemstone Price Guide Constantly Updated?So, IGS’s price guide is often our single source to rely on. My name is Leon, and this is my second year with IGS. I’ve been using IGS’s Gemstone Price Guide long enough to tell that there are many listed gemstone prices are not updated while their prices in reality, have gone double, triple, or even more. One very obvious is Moldavite.
- Meteorite type? Is it worth getting certified?Found this thr other day it weighs 28.8grams density is 3.31 and magnet sticks and stays. U can see some of whatever type of metal it is under crust. Looks like it has very thin stacked and group lines with each group going in another direction.
- Presidium Gem Testers - Gem Related Discussion - IGS ForumsYou’re right, the IGS certification course likely focuses on more sophisticated gemological equipment because the PGT II relies on thermal conductivity testing, which has some inherent drawbacks. Here’s a breakdown of why the PGT II might not be considered a definitive tool by professional gemologists:
- IGS ForumsCommercial posts related to gems/gemological services for sale or gems/gemological services wanted. IGS assumes no liability for any transactions or communications initiated through this forum. Each member has a limit of 5 "for sale" posts per month.
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