It is essential that these pressures be met by the constant
publicity to show that only the diamond is everywhere accepted
and recognized as the symbol of betrothal.
That is an excerpt from a fascinating article in the upcoming
Atlantic Monthly about Diamonds in 20th century material culture,
and how De Beers manipulated that culture.
It is rather long, but do please take a look. It is rather, um,
edifying. Here is the link: