Nothing increases the real accuracy, adjustments only can rediredt the attention or compensate something which is inserted earlier and reduces the accuracy.
The jewel metal has poor contrast against the skin. Some more southern type skin color would give more room to the jewel to be seen clearly. The other images in seller's website really have models who have darker skin colors.
The jewel on the ear looks blurry and dirty. The adjacent one is much cleaner. But it's also substantially larger, so the available image size in pixels on the screen allows it to be much sharper. No idea how much of the dirt and blurriness of the jewel is caused by the photographer and what's inserted afterwards in not so successful editing attempts. The original RAW shot would be useful to be seen.
Fixing the bad one is not possible by adding local contrast. It becomes even more dirty (tested). The photographer must take a good sharp shot which has enough light on the jewel, but doesn't blow the skin white. A darker skin color would make it easier.
Another approach is to insert a separately photographed jewel or even a well rendered 3D model into the photo of the model.
Just to test how good contrast this small (in pixels) image could have with the original northern type skin color I drew a simplified fake and inserted it on your original image. The old jewel is roughly wiped off. The result:
High zoom in reveals that the metal is only a few pixels wide. The illusion of the metal comes from the mixture of red and white zones:
There's white and nearly fully saturated red. No dark cannot be inserted to the metal because it would look dirt, as your own image shows. There's not enough pixels for it, no matter it works in the adjacent big jewel. The only way to get more contrast is to make the background darker. Actually it's already used by inserting a shadow.