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I used to work in a dept. store in a sublease dept. selling "fish gravel", as we called it. Really really bad diamonds that should have been used for grinding wheels. The public didn't know any better.
I have GIA (Gemological Institute of America) certificates in Diamond Grading and Colored Stone Grading, and all the reasons cited in the article (www.diamondssuck.com) are true. Diamonds are a horrendous ripoff, a monopoly, etc. I don't know what "luster index" means, however.
DeBeers has been brainwashing Americans for years.
I haven't ever examined moissanite, but then I've never seen a D-flawless diamond (the highest cut and color grade possible) either. Never worked in a store with anything worth carrying out of the store.
Moissanite gives gem appraisers fits because they can't tell the difference between it and cubic carbon with their heat conduction tests. The refractive index and dispersion are different, so I guess they have to measure RI.
I think if I ever get married again, and want something really weird I might go for mokume gane which is metal beaten in layers to resemble woodgrains. Originated in Japan.
Now if you want the most expensive gem material per unit, get nephrite. Nephrite is real jade.
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