Instant purchase is welcome, except for items specifically listed for a particular buyer. Inner diameter: 16mm Last one! It's cool! The cat's eye effect is beautiful, and the blue tiger eye's chatoyancy has lightning-like flashes, making for a wonderful quality. It's a mix of the typical deep blue-gray (navy blue to gray) of blue tiger eye (hawk's eye) and the gray to black-gray parts of eagle eye. Overall, it's a calm, cool-toned mix of colors. Pattern: Instead of a uniform color, you can see natural stone-like marble patterns and stripes with different shades and tones depending on the part. This is rare, so if you want it, please do! Synergistic effects: As a power stone, it's believed to have a synergistic effect, enhancing the "insight" and "calmness" of blue tiger eye, and the "ability to take action towards goals" and "concentration" of eagle eye. #NaturalStone #TigerEye #EagleEye #HawkEye