Rose Tico's Medallion, from Star War - The Last Jedi.
From the film's Visual Dictionary we know: "Rose's medallion is a stylized ensign of the Otomok system, representing Hays Minor. It is made of pure Haysian smelt, a transition metal with incredibly efficient conductive properties. It is the partner medallion of the one worn by her sister, Paige"
You can see in the picture that this medallion can be produced to be Paige Tico's medallion as well, so you have the complete set.
This model Medallion is 2-sided - details in both sides - so it can be worn "reversed".
Rose_Tico_medallion.stl | 8.3MB |