Blue Sapphire Locket Set
By Aamir Mannan.
BLUE SAPPHIRE
One of the most important spectra in the whole series of practicing gemmologist in that of sapphire for it not only proclaims the species of stone, but also release whether it be natural or synthetic. The spectrum, which is due to iron, is
seen at full strength in green sapphire and in varying strength in yellow sapphire as has been described above. In blue sapphire the bands are again very variable in strength. Australian sapphire show all three bands quite strongly while in ceylon sapphires which contain very little iron, only the 4500 band can be seen. The
band is an ordinary ray band and therefore shows at maximum strength in the direction of the optic axis. In a cut stone this direction may usually not be known, but it is worth while, if the band is not very faintly seen, to turn the stone on edge and on end in attempt to see the band more strongly.
By Aamir Mannan.
One of the most important spectra in the whole series of practicing gemmologist in that of sapphire for it not only proclaims the species of stone, but also release whether it be natural or synthetic. The spectrum, which is due to iron, is seen at full strength in green sapphire and in varying strength in yellow sapphire as has been described above. In blue sapphire the bands are again very variable in strength. Australian sapphire show all three bands quite strongly while in ceylon sapphires which contain very little iron, only the 4500 band can be seen. The
band is an ordinary ray band and therefore shows at maximum strength in the direction of the optic axis. In a cut stone this direction may usually not be known, but it is worth while, if the band is not very faintly seen, to turn the stone on edge and on end in attempt to see the band more strongly.
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