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RE: Friday Rock: can you tell which ones are man-made rocks? หินก้อนไหนไม่ใช่หินที่เกิดตามธรรมชาติ?
Hahaha, I am laughing. It is often very hard to tell lab-grown from the real.
Hahaha, I am laughing. It is often very hard to tell lab-grown from the real.