Gemstone color is the most obvious feature of a gem. Aquamarines range from mystical icy blues to the darkest teals of the ocean, depending on how much iron is present in the structure of the gem. Deeply saturated blues—closer to the intensity of a sapphire—are more highly valued. Larger gemstones are typically a vibrant blue color, while smaller stones tend to be paler. Popular color variations of aquamarine are identified by their trade names:
Brazilian Aquamarine: “Brazilian” refers to the blue-green color of this type of aquamarine, not that it’s mined in Brazil—although it can be.
Madagascar Aquamarine: This aquamarine isn’t necessarily sourced in Madagascar—rather, the name refers to its medium-blue tone.
Santa Maria Aquamarine: This aquamarine is from the Santa Maria mine in Brazil and is known for its deeply saturated blue color.
Maxixe: Pronounced “mah-she-she,” this aquamarine is a less common variety with a brilliant—albeit unstable—blue color. The blue fades over time into a yellowish-brown when exposed to daylight. Because of this, Blue Nile doesn’t carry maxixe aquamarines."