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Because of diamond's perfect and easy cleavage, it is vulnerable to breakage. A diamond will shatter if hit with an ordinary hammer. [12] The toughness of natural diamond has been measured as 2.0 MPa⋅m 1/2, which is good compared to other gemstones like aquamarine (blue colored), but poor compared to most engineering materials. As with any ...
Diamond certified FL (flawless) by the GIA Two diamonds of grade VS 1 and SI 2 respectively. The GIA diamond grading scale is divided into six categories and eleven grades. [2] The clarity categories and grades are: [3] Flawless category (FL) diamonds have no inclusions or blemishes visible under 10× magnification. [3]
Hardness comparison table. Brinell HB (10 mm Ball, 3000 kg load) Vickers HV (5 kg) Rockwell C HRC (120 degree cone 150 kg) Rockwell B HRB (1/16" ball 100 kg)
A superhard material is not necessarily "supertough". For example, the fracture toughness of diamond is about 7–10 MPa·m 1/2, [16] [17] which is high compared to other gemstones and ceramic materials, but poor compared to many metals and alloys – common steels and aluminium alloys have the toughness values at least 5 times higher. [18]
The quality of a diamond's cut is widely considered the most important of the four Cs in determining the beauty of a diamond; indeed, it is commonly acknowledged that a well-cut diamond can appear to be of greater carat weight, and have clarity and color appear to be of better grade than they actually are.
As these are commonly caused when a diamond is worn, it is suggested that while diamonds are being set, a little space be left between the base of the diamond and the head of the prongs of the ring. This space acts as a cushion protecting the diamond from possible chipping when it falls. However, chips are easy to remove by treating the diamond.
The Rock is a 228.31-carat white diamond which has been graded by the Gemological Institute of America. It has G color, VS1 clarity. [1] The color of white diamonds can range from D to Z: D-color is the highest grade for white diamonds, and it is the rarest and most expensive. The Rock is G-color, which is the fourth whitest level of white ...
Consequently, it has been suggested that "stacking disordered diamond" is the most accurate structural description of lonsdaleite. [13] On the other hand, recent shock experiments with in situ X-ray diffraction show strong evidence for creation of relatively pure lonsdaleite in dynamic high-pressure environments comparable to meteorite impacts.
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