Fascinating Blue Sapphire Gemstone with Negative Crystal Inclusion, 1.51 cts., 7 x 6 mm., Oval ShapeGem: Sapphire (Negative Crystal Inclusion) Weight: 1. 51 cts. Size: 7. 05 x 6. 11 mm. Color: Light blue with a hint of Purple Clarity: SI Cut: Oval Locality: Sri Lanka Treatment: None Here is a fun gem! This stone looks plain enough, just a nice blue Sapphire from Sri Lanka. However, when you get in close with magnification then you see something quite interesting. Just under the table on one side is a well defined, negative crystal inclusion. This is