THIS IS A NATURAL STONE MINED AT LIGHTNING RIDGE AUSTRALIA-THE HOME OF BLACK OPAL.THIS STONE HAS A PROFFESIONAL FINISH AND IT IS READY TO BE SET IN JEWELLERY.AS WITH ALL OUR STOCK WE OFFER A MONEY BACK GUARANTEE IF YOU ARE NOT PLEASED WITH YOUR WIN. .OPAL COLLECTORS CAN SEE US AT GJX SHOW BOOTH 907 TUCSON USA. TYPE OPAL - BLACK OPAL FROM LIGHTNING RIDGE, AUSTRALIA GREEN BLUE PURPLECOLOR SIZE: 15 X 11 X1 MM APP. (LARGEST PIECE) Opal Body Tone Scale as per recommendation by the Australian Opal and Gem Industry Association Ltd. Brilliance Scale: 1 Faint, 2 Dull, 3 Bright, 4 Very Bright, 5 Brilliant - Gem Quality The Seda Opal Story Paul Sedawie started mining at the Four mile field in Lightning Ridge in 1986 with his first partner Bob Young. It took them 6 months to find a decent stone and this experience gave me a healthy respect for the stone and how hard it is to find. The Seda Opal company was incorporated in 1994. We are a member of the Australian Opal and Gem Industry Association .we and . Seda Opals is an abbreviation from our surname Sedawie. The business is mainly wholesale and it is through this site that we can bring the opal fields direct to you. If you don’t really like anything, return it for a no questions asked refund or swap it for other stock. You will also find us as the trade shows in Tuscon and Denver. We also send sales staff to some Europe and Asian countries. Our aim is to offer a realiable, friendly service providing good value for your money. Your continued business is our business. All the best. Paul Sedawie and staff.