Diamonds and precious stones, a popular account of gems .. . Fig. 59-—Saxon Topaz. Fig. 60. — Brazilian Topaz. mid, and its colour includes all the shades fromorange yellow to wine yellow. 9 130 PRECIOUS STONES. The Siberian topaz is nearly always found inrhomboidal prisms, terminated by a ditetragonalpyramid ; it is of a pale blue or green cast of colour,and sometimes occurs colourless, when it is muchprized. Although in form of crystaUization theseSiberian minerals are really topazes, they approachvery nearly by their tint and transparency to theaquamarine.

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