AMETRINES ARE AN INTERESTING COMBO OF AMETHYST AND CITRINE.BOTH ARE QUARTZ.WHEN COMBINED TOGETHER IN THE ONE GEM THEY PRODUCE AN INTERESTING EFFECT THAT IS ADMIRED AND SOUGHT AFTER BY MANY.THESE GEMS MEASURE.OVAL 10X13MM AND OCTAGONAL CUT IS 18X7MM.A GREAT COMBO FOR A SET THAT WILL STAND OUT.