Rarer than diamond. More coveted than any other coloured stone. And the finest ones glow in the dark.
Ruby is red corundum, coloured by chromium. The same element that causes colour also causes fluorescence — chromium absorbs ultraviolet light and re-emits it as red. In low-iron Mogok rubies, where iron cannot quench the effect, this fluorescence is strong enough to be excited by the UV wavelengths naturally present in daylight, amplifying the red and giving the stone an inner intensity that distinguishes the finest Burmese material. Iron content controls how much of this effect survives — which is why rubies from different origins vary so dramatically in their luminosity.
Ruby has been the most prized gemstone in Asian cultures for over two thousand years. Burmese warriors embedded rubies in their flesh before battle, believing the stone made them invulnerable. The Sanskrit word for ruby — ratnaraj — translates as king of precious stones. The Mughal emperors were passionate collectors; many of the great Mughal rubies were engraved with their names and the date of acquisition. In the West, ruby's association with passion and protection runs equally deep through medieval heraldry and religious iconography.
— GIA Gems & Gemology: A Decade of Ruby from Mozambique
Ruby demands respect in a setting. The stone is too significant to be overwhelmed by metalwork. I approach ruby design with restraint: the crown should elevate the stone without competing with it, the halo should amplify rather than distract, and the band should anchor the whole composition so the eye always returns to the red. Three-metal construction creates the structural interest without stealing the show from the stone.
Colour is everything: the finest rubies show a vivid, slightly bluish-red — what the trade calls pigeon's blood. Fluorescence is highly desirable and can be assessed in person. Avoid stones with strong purple or orange overtones unless they are otherwise exceptional. Burmese origin commands the highest premiums. Request GIA or Gübelin certification; heat treatment is near-universal and accepted, but significant fracture filling is not.
Sapphire is ruby's closest relative — same mineral, every other colour
I source stones individually and can discuss what's currently available. Every piece is designed around the specific gem.
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