Salah satu parameter pengujian keaslian batu akik selain tingkat kekerasan (Hardness) adalah Specific Gravity (Berat Jenis) Batu Akik.
Untuk mengukur tingkat kekerasan batu mulia diperlukan alat ukur yang khusus, karena dalam pengukuran tingkat kekerasan batu (Hardness) batu yang sudah dibentuk tidak boleh cacat dikarenakan oleh alat ukur. Skala tingkat kekerasan dalam satuan MOHS, itu sangat sulit dilakukan.
Namun selain tingkat kekerasan, parameter lain untuk mengukur tingkat atau kualitas batu mulia yaitu specific gravity. Pengukuran specific gravity tidaklah terlalu sulit dan tidak akan merusak batu mulia tersebut dikarenakan pengukuran berat jenis batu tersebut. Berikut rumusnya!
Rumus Untuk Mengukur Specific Gravity adalah:
Rumus Untuk Mengukur Specific Gravity adalah:
Specific Gravity = Mu/(Mu-Ma)
Mu = Massa di Udara (Kg)
Ma = Massa di dalam air (Kg)
Berikut daftar Specific Gravity (berat jenis)145 varietas batu permata yang sudah distandarisasi, diatur dalam urutan:
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