gems, corundum, spinel, cobalt blue spinel, paraíba tourmaline, quality analysis, pigeon’s blood ruby, quality.10, color science, colored stone grading, Broken Bangle

The market today is increasingly asking for color descriptors to be added to colored gemstones, especially from the labs on their reports. But talking about color comes with many complexities, making it a near-impossible task. All gemologists and gem traders should read this.