400 Carats AAA Top Gem Grade Ethiopian Welo Opal Rough all with Fire and Color. Direct from Ethiopia these are Opals are High Graded. Yes we could sell these one at a time.. Large Each opal measures from 10mm to 20mm. Weight is from 5 to 15 carats each Opal.Visit our e bay store at. The item "400 Carats AAA Top Gem Grade Ethiopian Welo Opal Rough ALL with Fire and Color" is in sale since Friday, November 6, 2020. This item is in the category "Jewelry & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Opal\Other Opals". The seller is "desertstararizona" and is located in Tucson, Arizona. This item can be shipped worldwide.