They might be microscopic cracks shaped like feathers, or microscopic diamond crystals, or even crystals of some other gemstone. Glow necklaces are an extended form of glow bracelets. They are just of a bigger size than the glow bracelets.
Diamond Certificate
Explanation of Cut, Color and Clarity of This Diamond
Cut Quality The ideal cut diamond is a very precise mathematical equation, where diamond proportions and angles are cut to optimize the diamond's superlative optical properties, in particular it's high refractive index and color dispersion, to create a diamond of unequaled beauty with perfect balance of brilliance and fire. In layman's terms, the diamond is cut to make it the most beautiful diamond so it retains its intrinsic value.
Color Diamonds of G color are nearly colorless. G color diamonds may have a slight yellowish tint when viewed against white flat background. When set in platinum or white gold jewelry the presence of color will not be noticeable which makes diamonds in this color grade very popular.
Clarity Typically VS2 diamonds have minuscule inclusions. Inclusions in VS2 clarity grade should be mainly light-colored and completely invisible to the naked eye. Very small dark inclusions are allowable under the girdle when view under 10x magnification. Diamonds in VS2 category are great choice for people looking to balance high clarity and affordable price.