This is a very rare stone that is known by two names Dr. Limori Stone and Victoria Stone.  I have had this material myself for about 15-20 years.  This cab weighs 27.55 ct . This is rumored as a  reconstructed stone madeup of 7 minerals.  The history as I understand it is that there was a Japanese scientist Dr.Limori who made this material and sold in the 60"s to the 80"s . He never told anyone the process of making the material before he passed and it has yet to be reproduced . The only available material is from long ago which makes it very rare . Now there is some simulants that have been produced more recently that resemble it but are not the same. This is all lore as I know it . I am sure there is many different beleifs about this stone .This is my overall understanding as Ive heard about it over the years . An amazing cabochon polished with beautiful chatoyance . Picture shown with dime for size .