Most clients, when they contact me for custom work, have a general idea of what they'd like to have made.  Some have a little bit more specific but this was the most specific request that I have gotten; 6 pairs of 3mm Rainbow Moonstone cabochon, Sterling Silver, stud earrings.
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The lady requesting them already had a pair that she liked and had 7 pairs of holes in her ears so she asked me to make some to match.  We searched for many hours for 3mm Rainbow Moonstones.  We could find Moonstones but she was set on Rainbow Moonstones for their blue flash, and I can't blame her, they are beautiful stones.
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I finally found a supplier in Thailand that had 3.5mm stones.  We decided to go with it, since she had also been looking for a year or so and couldn't find anything either.  (The shipping cost more than the stones!  LOL).  The only problem with cabochons that are imported, many times, is that they are not calibrated so they may be 3.25mm's or 3.75mm's and they'll just throw them in with the 3.5mm's.  It doesn't seem like a big difference but the customer wanted a clean, low profiled design so we went with bezel cups, that don't come in 3.5mm, only 3mm or 4mm!  So, I chose the lowest stones with the nicest flash, (I ordered more than she needed so I could pick and choose), and I proceeded to set me and hammer the bezel to fit.  It was a real pain and very time consuming but we think it was worth it.  I sent her the pictures before sending them out.  She liked the pics so off the earrings went to their new home.
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Here are the 3.5mm Rainbow Moonstone cabochon post, SS, earrings.  ;)

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The angled images were to show her how low the settings were as she requested,
and the right image was to who the nice blue flash that they had.