When Bolivia’s ametrine mine reopened in the 1960s after being lost for centuries, the gem’s bicolor appearance became popular with dealers and gem designers. Its colors range from pale to intense amethyst and citrine shades.
Fine ametrine shows medium dark to moderately strong orange, and vivid to strong purple or violetish purple. Larger gems, usually those over five carats, tend to show the most intensely saturated hues. Dealers look for an attractive half-and-half distribution of each color, with a sharp boundary between the two colors at the center of the fashioned gemstone.
Rectangular cuts show off ametrine’s unique appearance. Photo by Robert Weldon/GIA, courtesy Cynthia Renee Co.
Connoisseurs prize imaginative designer cuts that display ametrine’s two colors in artfully blended or contrasting combinations.
This 48.50-ct. ametrine, fashioned by gem designer Dalan Hargrave, dazzles the eye. Photo by Robert Weldon/GIA, courtesy Minerales y Metales del Oriente, Bolivia, SA.
Much of the faceted ametrine in the market is eye-clean, meaning it lacks eye-visible inclusions.