Since one carat of opal is worth US $ 700, such a stone can be regarded as a national treasure. The processing factory worked on the opal day and night under heavy guard before the statue was finished, and was shipped to the museum together with the pieces left over.
王教授說，蛋白石是珍貴的寶石，每克拉價值美金七百元，澳洲博物館委託的這個蛋白石重逾一千克拉，可說是稀世之寶，受委託的加工廠在日夜派人守護監督下完成這個作品，連同剩餘的碎蛋白石一併寄回，深獲對方的激賞。