[Vol. 1] The size and facets of gemstones 2003/07/14by Junichiro Soejima [Vol. 2] The Essence of Diamond Value 2004/02/23 by Takaya Harikae [Vol. 3] Why Gemstones are Difficult to Understand 2005/02/11 by Michio Yokokawa [Vol. 4] A Hundred-Year-Old Catalog 2005/02/25 by Nobuyuki Harada [Vol. 5] How Necessary is Total Weight? 2005/03/11 by Junichiro Soejima [Vol. 6] Lessons from Repairs 2005/03/25 by Tadaaki Yamazaki

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