Massive Bianco 248.70 carat Emerald Cut Yellow Diamond. . Important information about "Bianco-Created-Diamonds®". Bianco® is a trademark that many consider to be synonymous with "the best of the best". "Bianco-Diamonds®" are not to be confused with a zircon, with Moissanite by Charles Colvard, simulated moissanite, simulated cubic zirconia or a crystal. "Bianco-Created-Gemstones®" and "Bianco-Diamonds®" are unique man-made, hand-cut, creations that have been hand selected for their beauty, comparable to the finest geologically mined gemstones. Bianco stones have extraordinary properties - specific gravity between 5.6 and 6.0, 1.6 times that of an uncut diamond, refractive index is high, at 2.15–2.18, its dispersion is 0.058–0.066 and using the same grading scale as a geological carbon diamond. White diamonds fall within a color chart of colorless A-C, near colorless-F, faint yellow G-N up to "SZ" which is yellow. This stone, if graded using a geological diamond grading system, would be classified as VVSI-E, virtually flawless. Your gem comes with a certificate of authenticity and lifetime guarantee from breaking or chipping."Bianco-Creation-Gemstones® have been purchased, for over three decades by the sophisticated, elite, and celebrity buyer.