gems, quality analysis, aesthetics, fine gems, cutting, topaz, imperial topaz, beryl, aquamarine, Idar-Oberstein, hauyne, peridot, tourmaline, canary tourmaline, paraiba tourmaline

The Value of Colours is a personal book and digital project by German gemstone merchant and gemmologist Constantin Wild, sharing stories from his multi-generational trade history in Idar-Oberstein, the fine art of cutting, and global travels to find rare colored gems. Well illustrated in color.