Hi and welcome
Is Puddin your only piggy? It is difficult to judge from a picture because normal healthy piggies also have a sparkle, but just not as much when the light is falling on them. Puddin is very cute, though!
Please be aware that by far not every satin piggy will develop Satin Guinea Pig Syndrome (SGPS), as it is now called; but if they do, then it is sadly incurable and progressive. Symptoms typically manifest around 18 months of age in those affected but in very severe cases can show sooner.
Satins are generally very rare in chain pet shop piggies; they are more a backyard breeder problem. Currently they are a real headache for especially Australian rescues.
You can find a picture with a satin piggy and her normal family (to show the difference) towards the end of our breeds guide with links to more information. Compare the satin piggy pictures with those of plain smooths and you may be able to work out better whether you have got a satin or not. Here is the link:
https://www.theguineapigforum.co.uk...ig-picture-guide-to-common-pet-breeds.121399/
PS: Please always consider same sex company for any single guinea pig. It is by far the most loving gift you can ever make your piggy because guinea pigs are group animals and not wired to be on their own. Looking after single guinea pigs comes with challenges because they will project all their social needs fully onto you; they need as much interaction with you daily for their whole life span to try and fill the 24/7 stimulation and interaction they have with their own kind. How this needs can come out is one of the topics discussed in this guide here:
Single Guinea Pigs - Challenges and Responsibilities