Yes and no. The carbon configuration in a diamond is not thermodynamically stable, but it is kinetically stable... That is to say physics wants it to fall apart to graphite since graphite is lower in energy... but the speed at which that would happen would be so slow that we would never see it in our existence as humans.
It depends how you look after them!
forever
If you believe the DeBeers marketing group, and you should: diamonds last forever.
As far as I know, baguettes last as long as a diamond and "diamonds are forever".
While diamonds are durable and can last a long time, their value is not truly eternal. The perception of diamonds as forever may be more of a marketing myth than a reality.
Nothing is forever, since the universe is finite. But diamonds will last "forever" as far as the human race is concerned. We've only been around for about 100,000 years, and diamonds have been around for billions. Diamonds do in fact decompose spontaneously into graphite, but at a rate so slow that it is unnoticeable even after millions of years.
Diamonds Are Forever was released on 12/17/1971.
The Production Budget for Diamonds Are Forever was $7,200,000.
The duration of Diamonds Are Forever - film - is 2 hours.
Diamonds are Forever is 2 hours and 5 minutes long.
Diamonds Are Forever - film - was created on 1971-12-14.
Diamonds Are Forever grossed $116,000,000 worldwide.
Diamonds Are Forever grossed $43,800,000 in the domestic market.