"In mineralogy, diamond (/\u02C8da\u026A\u0259m\u0259nd/ or /\u02C8da\u026Am\u0259nd/; from the ancient Greek \u1F00\u03B4\u03AC\u03BC\u03B1\u03C2 \u2013 ad\u00E1mas \"unbreakable\") is a metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice. Diamond is less stable than graphite, but the conversion rate from diamond to graphite is negligible at standard conditions."@en . . . "Diamond"@en . . . . .