What do these numbers on the back of my earring mean? Can someone help identify the authenticity or even what earring this is?

I know 925 means sterling silver but then under that it says SPI or something?
on the part that goes through your ear it says SPI 925 again

does anyone know what earring this is or what SPI means?
on the front there is one big diamond and 12 smaller diamonds around it

Caitlin2020-12-11T17:51:43Z

heres the front of the ring

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