Then when igneous rocks are converted into sedimentary and metamorphic rocks, corundum is also incorporated into these rocks. Furthermore, when the magma cools, igneous and corundum rocks are incorporated into this deposit. Like diamonds, corundum is formed billions of years ago inside the earth, under the earth's crust and in the mantle, under conditions of high temperature and pressure. Corundum crystallizes in a hexagonal system, producing a pyramidal shape or round barrel shape.
Like all other star sapphires, the star moves with changes in the angle of illumination and observation.īlack Star Ruby, like all other sapphires, belongs to a group of minerals known as corundum, a form of aluminum oxide crystals (Al2O3), which is after diamond, the most famous natural substance, with hardness 9 on the Mohs scale. The beauty of this stone is increasingly refined by its white gold setting where large black stones are surrounded by a row of 35 smaller pear-shaped white diamonds. The appearance of a bright six-star star in a truly black background is very beautiful. However, the center of the star is much bigger and brighter than normal star sapphires. Rays are not the same length some are shorter than others. On the other hand, the black star's sapphire beam is shorter and thicker stretching about halfway from the middle towards the corset.
The rays in the blue star sapphire are also quite thin and narrow and tapered towards the corset. Black Star The 733-carat Ruby is an oval-shaped gem cut like a cabochon like all other Ruby stars, but its rays or stars are not as long as normal blue star sapphires and other colored star sapphires that stretch from the center of the corset.
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