What is the most rarest color of a star?

The rarest color of a star is typically considered to be blue-violet. While most stars fall into the categories of red, yellow, or white, blue stars emit a high temperature of light and are much less common in the universe. They are often massive and have shorter lifespans, which contributes to their rarity. Additionally, the existence of blue-violet stars is limited, as they are typically found in specific environments like star-forming regions.