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Its emerald is perfect in color, its yellow-gold setting was hand forged, and instead of an inscription, it contains codes and symbols that only its wearer can understand. Halle Berry‘s engagement ring from beau Olivier Martinez truly “symbolizes the couple’s story,” according to the design house behind the bauble.

The ring, which Martinez commissioned from his Paris neighbor, Robert Mazlo, last year, is “a one-of-a-kind piece and cannot be replaced,” the jeweler tells PEOPLE exclusively.

The ring’s 4-carat emerald comes from old, “closed-down mines in Muzo, Colombia and the color is perfect,” the house continues. “The balance between the blue and the yellow in the green in that stone is perfect.”

The design also incorporates two diamonds in a textured, yellow-gold setting forged according to ancient Phoenician tradition. And while it doesn’t have an inscription per se, it does have hidden meaning.

“The ring is textured and contains codes and symbols which you cannot see … only the person wearing it can,” the jeweler says. “It’s very uncommon. The symbols and codes represent [the couple’s] story and only they can interpret it.”

Mazlo, who has known Martinez for several years, didn’t realize he was creating an engagement ring when the actor came calling. But his house tells PEOPLE he “was very touched to be involved in [the couple’s] story.” Tell us: What do you think of Berry’s ring?

–Peter Mikelbank

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