The word sapphire is derived from the Latin word sapphirus, which which originally referred to lapis lazuli.
10 things you might not know about sapphires.

https://topicaltens.blogspot.com/2025/03/14-march-sapphires.html

Rubies appear in Marvel Comics. The Godstone is a ruby that John Jameson found on the Moon. It is activated by moonlight, grafts itself to his chest and turns him into the Man-Wolf.

On National Jewel Day, 10 things you might not know about rubies:

https://topicaltens.blogspot.com/2024/03/14-march-rubies.html

The word diamond derives from the Greek word “adamas,” which means invincible or indestructible. Which is about right, as diamond is the hardest substance known to man. The thing that could cut through a diamond would be another diamond.

10 things you might not know about diamonds:

https://topicaltens.blogspot.com/2020/11/6-november-diamonds.html