They Symbolize Longevity
Diamonds sustain and survive immense stress before they finally are mined, cut, and set into the jewelry we buy. The extremes it goes through it symbolic of longevity in the best way possible. People gift each other diamonds as a testament to everlasting love.
The Buyer Wants It
Simply put, consumers tend to buy a lot of stuff they want but do not need. Diamonds easily fall into that category. Heavy emotions are usually involved, and a person with his mindset to buy cannot usually be swayed when he has the means and opportunity to make a purchase.
It Boosts a Sense of Self Worth
When a person buys themselves or others a diamond, it inevitably gives them a sense of pride and accomplishment. There is an intangible value attached to something so pricey and attractive as a diamond.