Guatemala Rings Jewellery.
By Aamir Mannan. BLUE SPINEL.
The absorption spectrum of blue spinel is another which is well-worth study. It is some what complex and difficult to describe, and may even vary a little in the nature from specimen to specimen. But when one
has one's eye in, so to say, the nature and distribution of the bands are very distinctive. Indications of the "Blue Spinel" bands can be
seen in many purplish or brownish red spinels also. the key bands to note are a broad one in the blue centered at 4590 A and a narrow band of about equal
strength at 4800 A, on the green side of this. Rather elusive bands of this in the green (5550 A), yellow (5920), and orange (6320) complete the pattern and give the impression of quite a rich spectrum. Nuanses of absorption which can hardly be counted as bands add to this impression of riches.
By Aamir Mannan. BLUE SPINEL.
The absorption spectrum of blue spinel is another which is well-worth study. It is some what complex and difficult to describe, and may even vary a little in the nature from specimen to specimen. But when one has one's eye in, so to say, the nature and distribution of the bands are very distinctive. Indications of the "Blue Spinel" bands can be
seen in many purplish or brownish red spinels also. the key bands to note are a broad one in the blue centered at 4590 A and a narrow band of about equal 
strength at 4800 A, on the green side of this. Rather elusive bands of this in the green (5550 A), yellow (5920), and orange (6320) complete the pattern and give the impression of quite a rich spectrum. Nuanses of absorption which can hardly be counted as bands add to this impression of riches. 
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