1.The color of sapphire is an indicator of its value.Place the sapphire arm's length and see if it is blue or black.If it's blue, your choice may be right.
2.Look at gemstones under natural sunlight and artificial light. Gemstones look lighter under strong light, but darker under ordinary sunlight.
3.See if the color is uniform and consistent, and the cracks will affect the beauty and durability of the stone.If the plume reaches the surface of the stone, a sudden impact will break the stone.
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