Crafted in 14K white and yellow gold, this Croft & Stern original design features an 11.47ct prong-set fantasy-cut ametrine. Accenting the ametrine are 5=0.15ctw bar-set earth-mined round brilliant cut diamonds. Suspended from a 2.0mm black silica cord measuring 17 inches in length, secured with a bayonet clasp and finished in a bright polish.
Designed by Kelly Sternau
Designed and Manufactured at Croft & Stern in Maple Grove, MN
Collector’s Note — Ametrine
Ametrine is rare by nature — a single quartz crystal showing both amethyst (purple) and citrine (gold) in one uninterrupted growth. The color zoning isn’t painted in; it forms underground when iron in the crystal is exposed to different temperatures and oxidation states during growth. Only one primary deposit in the world consistently produces natural ametrine of collectible quality: the Anahí Mine in Bolivia, a deposit that traces back to the 1600s.
This piece pushes the material farther than standard faceting. Instead of cutting flat, predictable facets, the lapidary used concave faceting paired with half-sphere carving from behind, creating the illusion of suspended water droplets inside the gem. The precision of the carving controls how light enters and disperses within the crystal, causing reflections to ripple and break like light moving through liquid.
Crafted in 14K white and yellow gold, this Croft & Stern original design features an 11.47ct prong-set fantasy-cut ametrine. Accenting the ametrine are 5=0.15ctw bar-set earth-mined round brilliant cut diamonds. Suspended from a 2.0mm black silica cord measuring 17 inches in length, secured with a bayonet clasp and finished in a bright polish.
Designed by Kelly Sternau
Designed and Manufactured at Croft & Stern in Maple Grove, MN
Collector’s Note — Ametrine
Ametrine is rare by nature — a single quartz crystal showing both amethyst (purple) and citrine (gold) in one uninterrupted growth. The color zoning isn’t painted in; it forms underground when iron in the crystal is exposed to different temperatures and oxidation states during growth. Only one primary deposit in the world consistently produces natural ametrine of collectible quality: the Anahí Mine in Bolivia, a deposit that traces back to the 1600s.
This piece pushes the material farther than standard faceting. Instead of cutting flat, predictable facets, the lapidary used concave faceting paired with half-sphere carving from behind, creating the illusion of suspended water droplets inside the gem. The precision of the carving controls how light enters and disperses within the crystal, causing reflections to ripple and break like light moving through liquid.
