How to identify the natural stone Cheng Qu
Clam density 2.70g/cm fand usually 2.5-3.0 degrees, the hardness can reach 4 degrees, part. Try to use a hand to a weigh weight, if feel very heavy or too light, there may be a non natural crystal.
Tridacna is the natural growth, carefully observe whether natural texture, which is two lines have the same Tridacna beads. The mineral structure in aragonite dominated, with layered structure, single layer thickness is 0.5-1.5mm, the level of clear and dense; the natural growth pattern without false Tridacna, observed under the magnifying glass without clear layered structure.
White, white teeth Tridacna and brownish yellow, bright appearance, surface is pearly luster; false white stone or crushed clam shell powder or white stone powder and glue which are pressed, white, stiff, surface polishing white shiny, not natural. Tridacna beads surface fine-grained, growth years on behalf of its in the deep sea, genuine luster and delicate, translucent, yellow and white, false Tridacna overall pale, dull.
Because of the limited by certain conditions, the old Tridacna beads the size and roundness and light weight is not the same, and there are some differences, the naked eye can identify. False size and roundness of Tridacna beads and weight are the same, often gives people a uniform, perfect feeling.As long as the natural gems, the world could not find a total of two individuals were perfect as like as two peas, if there are two lines of Tridacna beads is certainly not as like as two peas, natural form, there may be a shell powder pressing. But there are a number of clam as porcelain, no lines, but there will be a natural fried mark.There is a period of time in history will have products made of white coral, white shell called clam, grass coral or made of coral products often have to imitate Tridacna obvious holes, luster dull, color uniform, on the market see more products for the dyeing, can wipe out the surface with alcohol cotton color.
There will be old Tridacna crack, and the crack length and the thickness, direction, disorder, no more consistent. Under the magnifying glass can be seen around the crack and yellow.
