Trapiche Amethyst — The 6-Ray Star Pattern
Rare trapiche-like amethyst from our own deposit in Brazil — mined, cut, polished, and shipped directly from our factory. No middlemen.
Our Biggest Discovery
In 2016, we started our mine project in Rondônia, Brazil. We were looking for high-quality amethyst. Brazil is known for abundant amethyst, but we wanted something more reliable: a direct chain from mine to buyer.
What came out of the ground was not standard amethyst. Some specimens showed a six-ray star pattern we did not recognize at first. After careful research, everything pointed to a trapiche-like radial formation — a pattern famously associated with Colombian emeralds, but rarely documented in amethyst. That discovery became what we now call Trapiche Amethyst.
A decade later, we still sort every Trapiche specimen ourselves. Each piece carries a clear chain of custody — from the rock wall it came from, through our factory, to the shelf it reaches. This is not just a story we tell. It is the reason we own the mine.
Scientific Reference
Featured in Journal of Gemmology
Trapiche-like Amethyst and Quartz Materials from Rondônia, Brazil
Mineração Costa Marques — the family operation behind Amezoni Crystals — is the subject of a Gem Notes article in Journal of Gemmology, the peer-reviewed publication of Gem-A (Gemmological Association of Great Britain).
The article documents the trapiche-like pattern in amethyst from the Amethyst Costa Marques mine in Rondônia, north-western Brazil — including colour zoning, hydrothermal quartz mineralisation, and the production potential of the deposit. It also references our debut at the Denver Mineral, Fossil, Gem & Jewelry Show in September 2021.
The diversity of quartz materials being produced by Mineração Costa Marques is notable, and… the deposit shows excellent potential for long-term production.
— Brendan M. Laurs, Journal of Gemmology, 37(8), 2021
Reference
Laurs, B.M. "Amethyst with Trapiche-like Patterns and Other Quartz Materials from Rondônia, Brazil." Journal of Gemmology, Vol. 37, No. 8 (2021), pp. 763–765. Published by Gem-A. © 2021 Gem-A.
Gem-A and Journal of Gemmology are referenced for bibliographic purposes only. This page does not imply endorsement, certification, sponsorship, or commercial partnership.
Press Coverage
Featured in independent press
Institutional Recognition