I googled this :
Tridacna Gigas Shell belongs to one of Buddhism's seven gems (gold, silver, coloured glaze, shell, agate, amber and coral). This precious underwater gemstone possesses graciousness and an intricate spiral design. Having gone through millions of years of cultivation, the strength of magnetism is in abundance. At the same time, it has also gathered nature's forces and worked to improve body's flow of magnetism.
Living within the presence of the gem's forces will strengthen the immune system and alter luck for the better. Tridacna Gigas Shell is a gem of choice.
I would assume that this material is very hard and difficult to carve .
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