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Sec. III, Ch. 5: The Star Stone

Sec. III, Ch. 5: The Star Stone Page of 366 Sec. III, Ch. 6: Spinel and Balas Text size:minusplusRestore normal size  Mail page Print this page
194                                 Star Stones.
transverse section of a hexagonal pyramid is made, these lines are seen as triangular strias From each set of parallel lines a narrow transverse luminous band is reflected, and the crossing of these three bands of light produces a star of six rays. Occasionally a secondary system of lines is apparent, thus giving rise to a twelve-rayed star. Great skill is required on the part of the lapidary in dealing with such stones to produce the most effective result.
Although the majority of Asterias are Sapphire, the same optical phenomenon is occasionally exhibited by other gems. The purple and reddish Corundums, when judiciously cut, shew Asterism, thus forming Star Rubies ; and in like manner we may have Star Emeralds and Star Garnets.
The Orientals have ever entertained a peculiar venera­tion for Star Stones, but only of late years have they been of any value in England. The finest Star Ruby lately seen was valued at £200. The price of these gems is mainly determined by quality and colour ; small Star Sapphires range from £2 upwards. Star Rubies obtain higher prices ; but Star-stones, of a secondary rank, are of little value.
Sec. III, Ch. 5: The Star Stone Page of 366 Sec. III, Ch. 6: Spinel and Balas
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