Spinel is a stunning gemstone known for its vibrant colors, durability, and rarity. Here's a brief overview:

Key Characteristics:

1. Colors: Spinel comes in a range of colors, including pink, red, orange, purple, blue, and black.

2. Hardness: Spinel has a Mohs hardness of 7.5-8, making it relatively durable.

3. Composition: Spinel is a magnesium aluminum oxide mineral (MgAl2O4).

4. Rarity: Spinel is relatively rare, especially in high-quality, vibrant colors.

Interesting Facts:

1. Spinel was often mistaken for other gemstones, like rubies, until its distinct properties were recognized.

2. Some famous historical gemstones, like the "Black Prince's Ruby," are actually spinels.