This document compares the gemstones aquamarine and blue sapphire. It discusses their differences in color, price, durability, and symbolism. Aquamarine has a lighter, brighter blue color that can have green undertones, while sapphire blues range from light to dark and almost black. Sapphires are generally more expensive than aquamarines. Both are durable, but sapphires are harder at 9 out of 10 on the Mohs scale versus 8 out of 10 for aquamarines. Blue sapphire symbolizes hope, loyalty, strength and power, while aquamarine represents tranquility, harmony and clarity.