GemDialogue & GemDialogue Color Toolbox - Portable color reference tool developed by Howard Rubin, that can attain more than 60,000 visual colors. The system works for matching both color gemstones and fancy color diamonds. GemDialogue supplies 21 transparent color scale charts, each of which shows the saturation levels (zones). Also supplied are a black to gray scale and a brown to light brown scale that are used for overlays. Included is the GemDialogue color toolbox, a cross reference manual of gemstone color systems. The manual covers the color communication notations in GemDialogue, Color/Scan, GIA GemSet, and The World of Color. All prices include shipping, however we only ship Domestically and to Canada.