and is very valuable for use in diamond drills since the Brazilian
carbonado has become so scarce. Well-formed shot boart, averaging about
the size of peas, sells readily for £6 a carat.
this separation has been made, the first eight classes are each further
subdivided according to their shades of color. The scale is given below
in descending order of purity —
Blue White, First Cape, Second Cape, First Bye, Second Bye, Off Color, Light Yellow, Yellow.
Only the first grade, or close goods, are carefully distinguished by separation of all eight shades. For other classes a