Sapphire is a precious gemstone, a variety of the mineral corundum, typically blue in color.
Fun fact: Sapphire comes in all colors except red - red corundum is called ruby!
The term "sapphire" also refers to:
1. A deep blue color resembling the gemstone
2. Sapphire glass - a synthetic material used in watch faces and smartphone screens
3. In tech slang, refers to high-end graphics cards (e.g. AMD Radeon RX 7900 XT Sapphire)