"The diamond is forever" — this iconic slogan from 1947 continues to contribute to the immense popularity of diamonds in engagement and wedding rings today. It carries a profound meaning, implying the everlasting and unchanging love symbolized by a diamond engagement ring. Celebrities with stunning diamond engagement rings include Beyoncé, Amal Clooney, Gisele Bundchen, Scarlett Johansson, and Kim Kardashian. The "Emily in Paris" star Lily Collins also wears a beautiful rose-cut diamond.

The most famous and precious diamond on Earth is the Kohinoor. This phenomenal stone was found in India and has been in possession of the British royal family since the 19th century.

Diamond is the hardest material found on Earth, being 58 times harder than any other natural material. It is rated 10 on the Mohs scale, meaning it can only be scratched by another diamond.

Diamonds are evaluated based on four important criteria (the 4 C's): Carat weight, Color, Clarity, and Cut. These criteria determine the quality and value of a diamond. While these 4 C's apply to white diamonds, diamonds come in all colors, known as "fancy colors." These fancy colors are highly rare and sought after, including yellow, pink, blue, and red.

* Locations: Including Botswana, South Africa, Congo, Namibia, Russia, Australia, and Canada.
* Birthstone of April.
* Celebrates a 10th, 60th, and 75th wedding anniversary.