Materials used- Base Metal 925 Sterling Silver
18k Yellow Gold Rhodium
Stone-Clear Cubic Zirconia, 1.56mm width, 1/70 carat
Details- Outside diameter 3cm. Depth 1.2mm,. Drop length 6.6cm.
Oxidation appears with time as this is just the metal (silver or brass) reacting to the oxygen in the air. Thus, this is considered normal wear and tear and is not a defect.