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The value of diamonds as an investment is of significant interest to the general public, because they are expensive gemstones, often purchased in engagement rings, due in part to a successful 20th century marketing campaign by De Beers.〔(【引用サイトリンク】url=http://www.bain.com/Images/PR_BAIN_REPORT_The_global_diamond_industry.pdf )〕 The difficulty of properly assessing the value of an individual gem-quality diamond complicates the situation. The end of the De Beers monopoly and new diamond discoveries in the second half of the 20th century have reduced the resale value of diamonds.〔(【引用サイトリンク】 title=A Diamond Market No Longer Controlled By De Beers )〕 ==Pricing formula== Tavernier's law (or Indian law) is used to determine the price of a diamond. The formula is for basic calculation and demonstrates how the price of a diamond increases along with its size. Larger gemstones are rarer and go up rapidly in price. Diamonds of 25 carats and more usually have their own names. : where: *''W'' is the weight in carats *''C'' is the basic price of a one-carat stone 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Diamonds as an investment」の詳細全文を読む スポンサード リンク
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