Figure 1. This 4.86 ct cabochon displays unusual yellowish chatoyancy against a predominantly purple bodycolor. Photo by Shunsuke Nagai. GIA’s Tokyo laboratory had the chance to examine a unique ...

Since entering the market in the late 1980s, Paraíba tourmaline has been sought after for its electric blue-green tone. A product called “Paraíba matrix” or “Paraíba in quartz” emerged about three ...

The article discussed how different gemstones could affect aspects of life. Amethyst, rose quartz, citrine, clear quartz, black tourmaline, lapis lazuli, jade, tiger’s eye, and selenite were ...

The mm-cm scale tourmaline in the occasionally discordant quartz tourmaline veins shows strong zonation and less effects of shearing. Those are strongly zoned indicating magmatic hydrothermal ...