或許有人會想：「我和伴侶是不是一定要買對戒？」但對戒不僅適合即將步入婚姻的伴侶，也非常適合那些在重要時刻希望象徵彼此承諾的人們。無論是訂婚、周年慶或是其他特別的日子，對戒都是紀念彼此關係的完美選擇。對戒不僅僅限於婚姻，更適合作為兩人關係的見證。
理由與求婚戒相同，男方想表達對女方的疼惜、重視時，男方會購買結婚戒指。
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The generation and distribution of diamonds is essentially consolidated inside the hands of a few critical players, and concentrated in common diamond buying and selling centers, The main currently being Antwerp, exactly where 80% of all rough diamonds, fifty% of all Minimize diamonds and much more than 50% of all tough, cut and industrial diamonds merged are taken care of.
Industrial use of diamonds has Traditionally been associated with their hardness, that makes diamond The best materials for chopping and grinding instruments. As the hardest known The natural way occurring substance, diamond can be utilized to polish, cut, or wear absent any content, such as other diamonds. Common industrial apps of this property involve diamond-tipped drill bits and saws, and the usage of diamond powder as an abrasive.
The dispersion of white light-weight into spectral colors is the principal gemological attribute of gem diamonds. From the twentieth century, professionals in gemology formulated ways of grading diamonds together with other gemstones based on the qualities most crucial for their value being a gem. 4 traits, acknowledged informally as the four Cs, are now frequently applied as The essential descriptors of diamonds: these are typically its mass in carats (a carat remaining equivalent to 0.
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N. W. Ayer & Son, the marketing company retained by De Beers inside the mid-20th century, succeeded in reviving the American diamond market place plus the business produced new markets in nations in which no diamond tradition had existed before. N. W. Ayer's marketing and advertising provided product placement, advertising centered on the diamond product or service by itself as an alternative to the De Beers brand name, and associations with celebs and royalty. Without advertising and marketing the De Beers model, De Beers was advertising its competition' 對戒 diamond merchandise too,[116] but this wasn't a priority as De Beers dominated the diamond marketplace through the entire 20th century. De Beers' current market share dipped briefly to next spot in the global market place below Alrosa during the aftermath of the global financial crisis of 2008, all the way down to under 29% concerning carats mined, as an alternative to marketed.
Other specialised purposes also exist or are being created, such as use as semiconductors: some blue diamonds are normal semiconductors, in distinction to most diamonds, which can be exceptional electrical insulators.
碳有數種已知的同素異形體：不定形碳 ，碳奈米泡沫 ，金剛石，藍絲黛爾石 ，蠟石 ，聚合鑽石奈米棒 ，環碳石墨烯、石墨和富勒烯。在熱力學上，金剛石的穩定性低於石墨，可自發轉變為石墨，但常溫常壓下這一轉變的速度很慢，可以忽略不計，因此鑽石得以穩定存在。自然界形成的金剛石一般形成於地球內部高溫高壓的環境，後來被火山噴發等地殼構造運動帶到地表，因此許多金剛石發現在火山附近。現代工業可在高溫高壓下生產金剛石，稱為「合成金剛石」。
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At area temperature, diamonds tend not to react with any chemical reagents like strong acids and bases.