On this page of our trophy guide to The Last of Us 2 you can find a detailed description of unlocking the So Great and Small trophy, which is awarded for finding an Engraved Ring. In our description we explain in which stage you can unlock this trophy and where the unique treasure was hidden.
The engraving ring is a collectible - you can find it along with other secrets as you play through the Downtown level, which is a large open map suitable for exploration.
To reach the secret, you need to explore the ruins of the Westlake Bank building located in the southern part of the map - this location is shown in the screenshots above.
Walk through the ruins until you reach the bank lobby. There is a group of monsters in this place and it would be a good idea to get rid of them.
Go to the back of the bank. You'll find a vault there. To open it, enter the following combination: 60-23-06.
Once inside the bank vault, examine the bank deposit box shown in the picture above. Inside it, you will find the engraved rings. This action will unlock the trophy.