Bolivia · Gemstone / Mineral Craft

Ametrine (Bolivianita) Bicolor Gem-Cutting

Bolivianita

The lapidary technique of cutting ametrine — a naturally bicolor quartz combining amethyst (purple) and citrine (yellow) within a single crystal — sourced almost exclusively from Bolivia's Anahí mine, the world's only significant commercial source. Cutters must work with, rather than against, the stone's natural internal color split, using techniques ranging from classic emerald-cut color-block faceting to more recent concave and "sunburst" cuts that maximize the visual interplay between the two colors.

Risk level: Vulnerable · Not applicable — a mineral/lapidary trade rather than an inscribed intangible cultural practice

Alternate Names
Ametrine cutting; amethyst-citrine faceting
Geographic Center
Anahí mine, southeastern Bolivia, near the Brazilian border (Santa Cruz department); cutting and manufacturing centered in the city of Santa Cruz
Community / Ethnic Group
Not tied to a specific ethnic community; a commercial mining-and-lapidary operation
Estimated Origin
The Anahí mine has a colonial-era legend (a 17th-century Spanish conquistador given the mine as a dowry upon marrying a native princess named Anahí); the mine was reportedly lost for over three centuries and rediscovered in the 1960s, with ametrine reappearing commercially in the 1970s; the mine came under stable private control in 1990
Cultural Function
Fine jewelry gemstone; also carries a romantic legend narrative used in marketing and cultural storytelling
Primary Materials
Ametrine (amethyst-citrine bicolor quartz)
Primary Tools
Standard lapidary faceting equipment (faceting machine, laps, polishing wheels)
Process Overview
Mine, wash, and presort rough ametrine at the Anahí mine; transport to the Santa Cruz manufacturing facility; grade and orient the rough stone according to its natural color zoning; facet using classic color-block, concave, or sunburst cutting styles to maximize the visual bicolor effect.
Traditional Applications
None in the pre-colonial sense; the colonial-era conquistador legend is the primary traditional narrative attached to the stone
Contemporary Applications
Fine jewelry — rings, pendants, earrings — marketed globally as a rare, single-source gemstone
Notable Practitioners
Ramiro Rivero, documented as the mine owner who established the modern mine-to-market chain of custody for Anahí ametrine, covering mining, cutting, jewelry manufacturing, and retail
Key References
GIA Gems & Gemology ("Anahí's 'New' Ametrine," Spring 2009; "The Anahí Ametrine Mine, Bolivia"); GIA Ametrine History and Lore; Gemselect; Gemporia
Verification Status
Desk-Researched

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