Due to Covid, many excavations in Honduras were halted and never reopened. This type of black opal is becoming increasingly difficult to find, now considered rare. Black opal is the most expensive opal in the world. This piece comes from a large reserve I purchased in 2017; all natural, untreated pieces. This piece features every color of the rainbow, from blue to purple to green, red to yellow to orange. A beautiful collector's item or a cut piece. Natural Opal Rough Top Colors Honduras Erandique Gualguire mine Multicolor Black Matrix UNTREATED! Flash Fire (green, red, blue, orange, purple, yellow) 28 cts - 5.6 grams 1 Piece - 25 x 18 x 15 mm about The colors of the opal are only seen in wet piece ( because it's rough ) Photo wet piece Lamp light condition! please be careful with the description and measures COMBINED SHIPPING (if you buy more items in the same auction you only pay 1 shipment) Standard shipping ( 2-7 days for Italy ) ( 10-20 days for Europe ) ( 15-40 days for rest of the world )