Dust did appear

[mmshl28]

Please tell me what you think

 

[Marianne]

Please tell me what you think

There will often be dust in the hole left over from the drilling process.

 

[ennui]

What do we think about what?
They appear to be freshwater pearls strung with gold beads. Very pretty, enjoy!

 

[Pearl Dreams]

I think the OP was wondering where the bit of pearl dust on the black mat came from. Marianne explained that it could be dust from the drill hole, left over after drilling.