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the diamonds natural refraction of light and it is beautiful. It is the cut that does this, however it is the qualities of the jewel which produce the brilliance once it has been cut. Brilliance can be measured by the amount of light which enters a jewel compared with the amount which comes back when put under a light source. Fire refers to the ability of the stone to refract light back out in colours. The light rays break up into their original spectrum colours and that is what gives the jewel its special character. Luster is the amount of light reflected back from the surface of the jewel. Durability is the toughness, the resistance to scratching, chipping, or splitting. This is detemined by its hardness, and it is also the hardness which determines the brilliance. Rarity is reasonably obvious. It is the availability of the jewel. Moissanite equals or outperforms diamonds in just about all categories. In particular it has superior brilliance, fire and luster. The only category in which it doesnt outperform diamonds is hardness. It is slightly softer than diamond, but only very slightly, and is harder than all other stones. Jewellers can stuggle to tell the difference between diamonds and Moissanite. In fact there is now a specific instrument which has been developed to help jewellers to tell the difference between diamond and moissanite as it is so hard to see and so many cannot tell them apart. 上一页 [1] [2] [3] [4] 下一页 |
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