鑽石分為一型和二型兩種，這主要是根據它是否含有N元素：一型含；二型不含。而藍色的鑽石是二B型的，是半導體。
In reaction to public fears that their diamond buys were being contributing to war and human legal rights abuses in central and western Africa, the United Nations, the diamond marketplace and diamond-investing nations launched the Kimberley Approach in 2002.[142] The Kimberley Method aims to make certain that conflict diamonds don't become intermixed with the diamonds not managed by these rebel groups. This really is done by requiring diamond-developing nations around the world to offer evidence that the money they make from selling the diamonds is not really accustomed to fund legal or innovative things to do.
Some conservative Mennonite teams tend not to dress in jewelry, together with wedding rings, as portion of their apply of basic costume.[28] The Amish usually do not have on wedding rings even so the Guys are clean shaven in advance of marriage and grow a complete beard soon after marriage.
這種在基質中的鑽石原石晶體的略微畸形八面體形狀是該礦物的典型特徵。它有光澤的表面也表明這種晶體來自原生礦床。
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作為世上最具標誌性的求婚戒指，璀璨鑽石的卡數雖喜好選擇，完美的六爪鑲座令閃鑽彷如凌空仔指環上，綻放最奪目的光芒。
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合成鑽石試圖利用複製高溫高壓的環境施加於晶種上，人工製造鑽石的生長現象。
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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」。
鑽石的色澤會因為化學上的雜質而有所偏差。完全純正的鑽石應該是透明無色的。鑽石偏向不同的顏色會影響它的價值。絕大部分的鑽石都是因為帶有氮原子而偏黃。白鑽越偏黃，價值便越低。但是偏粉紅或藍的鑽石價格卻較高。顏色強烈偏向粉紅或藍的鑽石可能價值連城。
The boundary 鑽石 in between gem-top quality diamonds and industrial diamonds is poorly defined and partly relies on sector disorders (such as, if demand from customers for polished diamonds is significant, some decrease-grade stones will likely be polished into reduced-quality or compact gemstones rather then staying marketed for industrial use).