The Pharaoh Eye Ring

Tricolor Tanzanian Sapphire Signet · 14k Yellow Gold · One of One. Size 7.5.

Color in a gemstone is chemistry. Most sapphires carry one dominant trace element — chromium for pink, iron for blue, titanium shifting the register between them. One geochemical event, recorded once.

The Pharaoh Eye carries three.

The stone is a natural Tanzanian sapphire from Songea — 1.35 carats, freedom cut — with three spatially distinct color zones preserved inside the same crystal. Red from chromium (Cr³⁺) substituting into corundum’s aluminum lattice sites. Yellow from iron in its trivalent oxidation state (Fe³⁺). Blue from iron and titanium working in concert (Fe²⁺/Ti⁴⁺), a charge-transfer interaction that produces one of the most saturated blues in the mineral world. These are not pleochroic shifts — the same color seen from different angles. They are spatially distinct growth zones: three separate chapters of the same geological story, written in the same crystal.

The cut follows the crystal’s own geometry. A freedom cut means the lapidary honored what the stone actually was rather than forcing it into a standard commercial shape. The uneven outline is a record of how this particular sapphire grew. It is set flush in a hand-carved 14k yellow gold signet, the bezel walls carved exactly to the stone’s natural edge. Eight salt and pepper diamonds are flush set surrounding the eye — two at 2mm, six at approximately 1mm. Their own organic inclusions carry a geological character that complements rather than competes with the sapphire. Hand-engraved lash lines are carved above the stone, cut directly into the gold by hand.

Treatment disclosure, because transparency is non-negotiable at Bravais: this stone has been heat treated and is beryllium diffusion treated (BE diffusion), which is standard and accepted practice for Songea origin corundum. Beryllium diffusion involves heating the stone in the presence of beryllium oxide, which allows beryllium ions to diffuse into the corundum lattice and intensify the color profile. It is a surface-to-shallow-depth treatment. It does not affect the tricolor growth zoning — that structure is intrinsic to the crystal geometry and was present before any treatment. The three colors are real, structural, and documented. The treatment enhanced their expression. It did not create them.

Over 1 carat of tricolor color distribution in a single Songea sapphire is genuinely rare. This combination does not happen by design or by treatment alone — it requires a specific and unusual set of geochemical conditions at the moment of crystal formation. What you are wearing is a record of three separate geochemical events that occurred simultaneously in a single growing crystal in southern Tanzania.

Hand-carved and hand-set by me, in Somerville, Massachusetts. One of one. When it sells, this piece does not return.

This piece is resizable within +/- two sizes.

Details

A Note from Abigail

I am a Chemical Engineering and BioMaterials Science professor at Northeastern University. I evaluate gemstones the same way I evaluate materials in my lab — at the atomic level. Treatment transparency is not a selling point at Bravais. It is the baseline. Every piece ships with complete disclosure of what was done to the stone, why, and what it means for value and wear.

The tricolor zoning in the Pharaoh Eye is the reason I made this piece. I have been collecting rare gemstones for over a decade and this stone is singular. The fact that it required BE diffusion to fully express that zoning does not diminish it — beryllium diffusion is a legitimate, industry-accepted treatment, and the colors it revealed were already structurally present in the crystal. What you are wearing is a record of three separate geochemical events that occurred simultaneously in one growing crystal in southern Tanzania. That is not something a treatment creates. That is something a treatment allows you to see.

Hand-carved and hand-set by me. One of one.