Iconic Audemars Piguet Royal Oak Ring. Octagonal design, 18k yellow gold size 53, US 6.5. Not sizable 
 
Designer: Audemars Piguet 
Weight: 14 grams 
Width: 11mm 
Size: 53/ US 6.5
Metal / Purity: 18K 
Hallmarks: Serial Number 53 750 1355 MI Italian hallmark 
Era/Style: Contemporary 
Condition: Pre-Owned, Very Good Condition, normal signs of wear 
Country of Origin: Italy 
 
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Link to purchase:
https://www.ebay.com/itm/236003078645