
Spinel, purple, Sir Lanka (4.58 ct)
Spinel has a high hardness. Spinel has a relatively high light refraction and no pleochroism, which means that if it has a continuous color, it will show it from all directions. Rare blue spinels in good color intensity may be colored by cobalt, among other things, a rather unusual cause of color for common gemstones.

Spinel, blue

Spinel, red
In the past, red spinel was often confused with ruby, partly because both faceted stones can show deep, fiery red, and partly because they occur in similar parent rock and can even look similar in the rough! The “Balas Ruby” in the crown of the English Crown Treasure is actually a red spinel.
At present, deposits are known in Tajikistan, which provide good qualities of pink and red spinels.
Procedure for investing in a colored gemstone from DEH
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