(Closed) FYI: Diamonds and Mirrored Inclusions

posted 5 years ago in Rings
Post # 3
729 posts
Busy bee

@Loribeth:  A very informative read…. Who’d have figure diamonds could mirror image like that. Learned something tonight

Post # 4
6355 posts
Bee Keeper

I remember the first time I saw that (in the mall, where else). The inclusion was under the table and reflected all around the diamond’s center like spokes on a wheel. I actually thought at first “wow, how can these inclusions be so symmetrical?!”

The good news is, GIA takes that mirroring into account when grading the clarity, similarly to how it takes location of the inclusion into account more generally. Note that every single example on that page is graded an SI1 or lower. You will not find this mirror problem in GIA VS diamonds or higher. But the site is right: reflected inclusions won’t be plotted on the inclusion map.

Post # 5
6355 posts
Bee Keeper

One thing I like about the phenomenon of highly visible mirrored inclusions is that it makes it very explict how light bounces around all over the internal facets of a diamond after it comes through the table and before it bounces back out through the table again (that’s on purpose: more bouncing around in there = better cut), so it shows why and how even what seems like a “small” less-immediately-visible inclusion like a cloud can seriously impact lightplay or performance.

Post # 6
2903 posts
Sugar bee
  • Wedding: January 2011

@joya_aspera:  “how even what seems like a “small” less-immediately-visible inclusion like a cloud can seriously impact lightplay or performance.”


I actually have owned a diamond that did this exact same thing…I kept thinking It was the fact it was a princess cut that it did not sparkle as much as I thought it should…but it was a “very good” cut diamond and sparkled great on the edges and awesome under that store lighting… but when I got it home I noticed that it looked dull round the “feathers”. I took the diamond back and traded it in for aa excellent cut and VS2 clarity (Of course I had to go smaller and pay $1500 more…gah)

Post # 7
494 posts
Helper bee
  • Wedding: August 2014

uh…pretty cool. Guess it makes sense. 

Post # 9
1769 posts
Buzzing bee
  • Wedding: August 1997

@Loribeth:  thanks for posting,  interesting. Hadn’t heard of that before. Natural gemstones are so cool. To think a diamond is a billion years old. Amazing.

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