Frederick William Rudler,
1911 Encyclopædia Britannica
(1911)
“ It is generally held that the mineral now called topaz was unknown to ancient and medieval writers, and that their τοπάζιον was our peridot. Such was probably the Hebrew pitdah, translated topaz in the Old Testament. Dr G. F. Kunz has suggested that the peridots of modern trade are largely derived from old jewelry. The famous shrine of the Three Kings in Cologne Cathedral contains a large peridot, which has commonly been regarded as an emerald. It is notable that pebbles of transparent olivine, fit for cutting, are found in the United States in Montana, Arizona and New Mexico ”
