is the stardream metallic sparkly white pluto sparkly on both sides or one

Yes, it has a shimmery sparkly finish on both sides of the sheet.

Hello, I bought Stardream Metallic Sparkly Bright White PLUTO several months ago and am now using it. I noticed when printing, some tiny bits are darker than others. They look like a bunch of darker small spots. I'm using an inkjet printer. Why is this happening?

We are sorry to hear you are having printing issues.  As far as we know, Stardream Metallic card stocks are not inkjet compatible.  Sometimes a customer is successful with. Inkjet printing, but the manufacture of the stock only states that the stock is digital, laser and offset compatible.

I have a laser printer, can this paper be used without problems? I will be making certificates.

This stock is laser compatible, as long as your printer can handle the weight of the card stock.  Be sure to check your printer specifications concerning printing and paper weights.