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Fine Jewelry University

1. 

   Gem in the Spotlight: Spinel

   FJU Category: Gemstones | Tags: Colored Gemstones, Folklore, Gem Spotlight, Gemology, Jewelry History, Spinel, Synthetic Gemstones

   … birthstone list. Spinel will be joining peridot as the August birthstone! This change was officially made in 2016, but only in the last couple of years have we started to see the majority of the industry get on board. If you know … index of 1.718 while its synthetic counterpart (depending on the process used) has a refractive index of 1.728. In recent years, scientists have developed new techniques to synthesize sheets of optically transparent spinel. This …

2. 

   Gem in the Spotlight: Ruby

   FJU Category: Gemstones | Tags: Folklore, Gem Spotlight, Gemology, Ruby

   …, respectively. Since sapphires and rubies are the same gem material, they also share a refractive index of 1.762-1.770 and a specific gravity of 4.00. A unique optical property of rubies is that they emit fluorescent light at a very … Imperial State Crown, is actually a red spinel. History and Lore of Ruby The first discoveries of ruby date back to 2,500 B.C. They were found alongside stone age tools in historic mines in Mogok, Myanmar. The Bible compares the price…