this post was submitted on 24 Dec 2024
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I'm asking about the light. The lightshow produced by a crystal is down to both the optical properties of the material, but also the geometry of how it was cut.
The image is really cool, but it only demonstrates a difference if the moissanite was cut into the exact same shape as the diamonds.
A prism doesn't split light because of the material its made of, but because of its shape.
Moissanite has a marginally higher index of refraction than diamond so the "ideal" cutting geometry would be different. This looks like a misleading demonstration intended to market something. They appear nearly identical in normal conditions
That's what I was immediately thinking.
Getting pretty colors out of a clear crystal is more about how it was cut, than what it's made of.
Unless it's something like opal that produces lightshows through completely different optical effects.
Isn't it both shape and material? The refractive index of the material is important in determining how much the light bends at the interface.
Yes, but a clear crystal is a clear crystal.
If you want to split light you can do what regardless of refractive index (as long as it isn't zero), you'd just need to cut different angles and/or project the light onto a surface that's closer/farther to get the same effect using a different material.
No, different materials have different refractive indices, even if they're both "clear crystals." Maybe the examples given are very close in refractive index, but they still differ, therefore split light differently. https://en.wikipedia.org/wiki/List_of_refractive_indices
I'm not saying it's the entire difference, but it certainly comes into play. It could be that the more "explosive" light example is cut identically, but held slightly askew versus the others.
Point is, it's not just the cut that impacts the result.
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That's literally my point.
I'm saying you can't tell the difference between two materials unless they are cut the same.
If they are cut differently to achieve the results you are seeing, you can't tell whether the difference is because of the cut, or because of the material.
That makes sense. It wasn't coming across in the earlier comments.
Ah, i misunderstood, yeah, there's got to be some rigging in that demo pic now that you mention it, however if Moissanite is essentially a drop-in replacement for diamonds in jewelry that is cheaper and looks even slightly nicer, which seems to be the case, then all should be well, doubly so if it kills the profits of De Beers. I'd ask to see the contrast IN PERSON if i was shopping for rings today though, nothing beats that.