Summary: "There are two major sources of rubies in Myanmar (Burma)—Mogok (Mandalay Division) and Mongshu (southern Shan State)—and several minor sources Nawarat/Pyinlon (near Namkhan, Shan State); Tanai and Nayaseik (Kachin State); Katpana (Kachin State); and Sagyin and Yatkanzin stone tracts (Madaya township) near Mandalay. Mogok and the smaller deposits are similarly hosted in white marble with considerable diversity among the rubies from each tract and strong similarities among the rubies between the tracts. Mongshu, although associated with metasediments and marbles, yields distinctly different rough and treated stones. Thus, stones from Mongshu are easily distinguished from those found at Mogok and the smaller deposits. These differences can be discerned using an optical microscope. Basic characteristics of stones from the minor sources are described, however further research is required to assess criteria for distinguishing among these sources and Mogok... Methodology: Several hundred rubies from these source areas in Myanmar were examined for features that could be recorded photographically using a Mark 6 Gemolite with a 10X eyepiece normally at maximum magnification (~60x). Images were recorded on 35 mm Ektachrome tungsten film (ASA 160) with an "eye-piece" camera and printed electronically on a FUJIX Pictography 3000 (TDT process printer). Images are presented here at relatively low resolution."