Bicolor Yellow and Pink Pixel Heart in Lab Sapphire 11.9 ct egg This would have likely been

This would have likely been grown by the Czochralski method--it is polished all around and only has minor chipping on the end faces

Colorless lithium niobate was once popular as a diamond simulant but it really isn't that good of one simply because it's much brighter and more dispersive than a diamond

55 and dispersion of 0

The only thing holding it back is its rarity

and which color predominates depends on the lighting (color and angle) as well as the background it is set against

Bicolor Yellow and Pink Pixel Heart in Lab Sapphire 11.9 ct egg This would have likely beenThis is a custom cut pink and yellow lab sapphire done in a pixel cut tablet heart. When held up in front of you it makes a sort of pixelated version of what's behind it. It weighs in at 11. 9ct and measures 14. 75x14mm.