London Blue Topaz Teardrop Pendant in Silver

Brilliant Earth

Pendant shape (teardrop) matches exactly, Gemstone color (dark blue) matches exactly, Setting style (simple bezel) matches closely, Chain type (delicate silver) matches, Overall size and proportion are consistent, Material (silver and gemstone) matches, Design simplicity aligns with the frame

Zales Sterling Silver Oval Blue Lab-Created Sapphire and Diamond Pendant

Zales

Dark blue gemstone color, Oval gemstone shape, Simple silver setting for the main stone, Silver-colored chain, Overall size and proportion of the pendant

Sterling Silver Blue Lab-Created Sapphire Birthstone Pendant

Kay Jewelers

Dark blue gemstone color, Simple silver prong setting, Solid silver bail, Oval gemstone shape is plausible, Silver-colored chain (implied)