Description Item Specifics Item Type: SOLID BLACK OPAL INTERNAL INCLUSION LINE CRACK Origin : LIGHTNING RIDGE Opal Size : 13 X 10 X 5 MM Treated/Untreated : UNTREATED Weight (Carats) : 5 CTS Colour : BLUE AND GREEN FIRE Pattern : BROADFLASH Number of pieces : 1 Accuracy of picture : + More Bright Accurate Less Bright Comments : Brightness Rating, 1 Dullest to 5 Brightest : + 1 2 3 3.5 4 4.5 5 Opal body tone as recommended by Australian Gemstone Association Ltd : + Base of opal (bottom) : + Full opal Clean back Some Sand Majority Sand Cabochon : + Low Medium High Definitions Convert Weight : 5 Carats = 1 Gram Covert Size : 6 mm = 1/4 inch (approx) READ THE OPAL PLUS STORY HERE