Among natural gemstones, there is a gemstone that is very similar to ruby, and even for a long period of time in history, people thought it was ruby, which is spinel. Natürlich, spinel has many colors and is not limited to red.
Spinel comes in various shades of color. It is roughly divided into red, blue and other colors. Red is colored by chromium and blue is colored by iron. Magnification inspection: Spinel usually contains more inclusions, but still looks better in transparency. Common spinel octahedral crystal inclusions, arranged alone or in rows. Liquid inclusions are common in open fissures. Can have starlight effect and discoloration effect.
In the quality evaluation of spinel, the color occupies an important position, with translucent deep red being the best and the highest value, followed by purple, orange, light red and blue. High-quality spinel requires good color, hohe Transparenz, good clarity, good cut ratio and good polishing.
The red spinel is red and pink edged crystals. The famous “Black Prince Ruby” on the British crown is an uncut red spinel, weighing about 170ct; Die “Timuel Ruby” is collected by the British royal family and is also a red spinel Stone, weighs 316ct. These two spinels have been regarded as rubies throughout history, and were not identified as red spinel white until modern times. It can be seen that red spinel and ruby are very similar in color, using the measurement of various physical properties of gems, such as refractive index, birefringence, absorption spectrum, relative density, pleochroism and luminosity, and internal characteristics They can still be easily distinguished.
A beautiful red spinel from Afghanistan. Sri Lanka has spinels of various colors, especially blue spinels.
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