Vintage Natural Opal Stone

•This beautiful stone was purchased in the 1970's •Was part of Grandma's jewelry collection • Has a mixture of green and blue • 5.23 carat stone ∆ Note: the flat side of stone is the illuminated part, the other side is round •Has original display holder with some information??? •Please take note..it was purchased in the 1970's for $707... today's price is about 3 times that amount.