How can a jewler tell the difference between a diamond and cut glass?

Question

The Hope Diamond is valued at about 100 million dollars. A piece of cut glass of about the same size is worth only a few dollars.

Has to do with reflection.

Answer 1

Hardness is the easiest, but a little training and you can tell by looking closely. Diamond has a high dispersion index.

To check for yourself, use hardness. Diamond is one of the hardest substances there is, so it will scratch almost anything. A glass plate or mirror is commonly used since glass will not scratch glass. But it will likely take an expert to tell the difference between diamond and silicone carbide, which is sometimes used as a diamond substitute and has characteristics much, much closer to the real thing than cut glass does.

Answer 2

ok if that's in user-friendly words glass or rhinestone that you try to fluctuate from right here's a trouble-free attempt get a white piece of paper with major points on it take your stones one after the other and lay them throughout the major points in case you may examine any of the letters less than the stone then likely that is glass or rhinestone even if that is diamond you cant examine any letters.

Answer 3

Diamonds can cut class. Glass can't. Besides, jewelers can just tell by looking usually - if you look at it enough, glass doesn't really look like a diamond.

Answer 4

Hardness and refractive index