This item is a natural untreated Ametrine.The gem has step-cut facetsGemstone origin...Bolivia. I purchased this best quality rough and faceted this gem in 2005. (20 years ago)It was valued in May 2006 for $12,8000.00 (Valuation pictured and supplied to buyer)The gemstone is a modified fancy step-cut shield natural Ametrine which weighs 76.9 caratThis gemstone is from the ground, absolutely eye-clean and real. It is very bright with high luster.The gemstone  shows rich warm deep purple and deep golden orange colors.The gemstone is very lustrous.Gemstone dimensions are 31.5 mm x 28.2 mm x 19 mm (approx.)Will be delivered express and free within Australia with tracking.For overseas buyers I will post via trackable mail.