3 grams 18 k White Gold. BRIGHTNESS IS RATED ON A ONE TO FIVE SCALE AS. Opal is Brilliant and Color Jumps out of the stone at you at arms length. Opal is Bright and Color is Crisp and Sharp at arms length.Opal has Good Color at arms length. Opal has Fair color but Nothing Special. Opal has Color but is Fairly Dull. Photos were taken under a 40 watt soft white light, without a flash and are NOT ENHANCED IN ANY WAY! I have been making Opal Jewelry for 25 years and stand behind all my work. This item is in the category "Jewelry & Watches\Fine Jewelry\Earrings". The seller is "flashopal" and is located in this country: AU. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.