Why the Fantasia Brand: Fantasia Mining is a USA company located in Massillon Ohio, with a 90,000 sq ft warehouse and over 2,000,000 lbs of stones and stone products in stock. We have been in business since 2010 providing stone related products to stores around the world, and as mine owners ourselves, we care very deeply about the quality of the products that we provide. The Fantasia brand of Fluorescent Hyalite Opal is hand selected, 100% natural, unheated, untreated, top quality opal directly from the mine in Mexico. Stone Size: 0.25" to 0.5" per piece average Stone Quantity: From 1-6 pieces per 25 gram lot depending on piece size Color: Clear, Fluorescent Green The sizes and colors are averages. It is possible to get pieces outside this range, or with other variances in color shades, patterns, translucency or other characteristics which can vary each time natural stones are mined.