Why Is Santa Maria Aquamarine So Valuable?

Santa Maria aquamarine is prized for its exceptionally rare, vivid, and deeply saturated blue color—a quality that sets it apart from standard aquamarine.

Aquamarine occurs across a wide range of shades, but most stones on the market fall on the pale end—icy blue, powder blue, or light greenish-blue, often with soft gray or green undertones. These lighter, more common colors are generally less valuable.

Santa Maria aquamarine, by contrast, shows a vivid, medium-to-dark ocean blue with strong saturation and little to no secondary green, gray, or brown tint. This intense, pure blue is one of the most highly prized colors in aquamarine.

What Does "Santa Maria" Mean?

The name comes from the Santa Maria de Itabira mine in Brazil, where this rare, intensely deep-blue aquamarine was first discovered in the 1950s. That historic mine is now largely depleted, so genuine stones from the original source are finite and heavily sought after by collectors.

Since 1991, very similar coloring has also been found in certain African mines—particularly in Mozambique—where these stones have come to be known as "Santa Maria Africana." Today, the term is used more broadly for aquamarines from these and other sources that display a similarly rich, deeply saturated blue, even though they don't come from the original Brazilian deposit.

What Determines the Value of Aquamarine?

Like diamonds, aquamarine is valued by the 4Cs: color, clarity, cut, and carat weight. Color is the most important factor—pale stones are common and less valuable, while deep, intensely saturated blue or greenish-blue stones command premium prices. Size matters too: larger stones with good transparency and desirable color hold significant value, and those combining large carat weight with exceptional color and clarity are especially prized.

Santa Maria aquamarine from Brazil typically costs between $300 and $1,000+ per carat, depending heavily on the stone's size, clarity, and depth of color saturation:

• Commercial or smaller stones (under 1 carat): usually $100–$300 per carat for moderately saturated material.

  
  

• Fine, top-tier gemstones (1–5+ carats): highly saturated, eye-clean deep blue stones regularly command $600–$1,000+ per carat.

  
  

Standard aquamarine—mined more widely in Brazil and across Africa (Madagascar, Mozambique, Nigeria) and other regions—is far more available and generally more affordable, though exceptional stones can still command real value.

In short, the price gap between Santa Maria and standard aquamarine comes down to a combination of color, saturation, size, clarity, rarity, and market demand.