"The Diamond As Big As The Ritz" 
Quoted, Tales of the Jazz Age (1922)
                                    
“I think diamonds represent luxury, indulgence, and class. So any time you can incorporate a gift that is synonymous with all those attributes, you know the other person will love it. I would challenge someone to find something that better represents Valentine's Day more than diamonds!”
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Chris Evans (actor) 8
American actor 1981Related quotes
                                        
                                        Diamonds, Unapologetic (2012). Cowritten with Benjamin Levin, Mikkel Eriksen and Tor Hermansen. 
Songs
                                    
Source: The Last Book in the Universe
“The most desired gift of love is not diamonds or roses or chocolate. It is focused attention. ”
                                        
                                        As quoted in  "Ronald Reagan and Race" https://www.nationalreview.com/2019/08/ronald-reagan-and-race-richard-nixon-tape/ (August 2019), by Jay Nordlinger, National Review 
1980s, First term of office (1981–1985)
                                    
Source: Looking Backward, 2000-1887 http://www.gutenberg.org/dirs/etext96/lkbak10.txt (1888), Ch. 9.
“Better a diamond with a flaw than a pebble without.”
                                        
                                        Attributed in Mohammed Sirajul Islam (1967), Everyman's General Knowledge 
In fact this is a Chinese saying by a Confucian scholar from the Ming Dynasty, 焦竑 (Jiao Hong) (1540—1620)《玉堂丛语》卷五: 宁为有瑕玉,不作无瑕石。 
Misattributed, Chinese