Highlight a different semiprecious stone for each day of the week and any outfit with this interchangeable pendant. Choose from seven natural Brazilian gemstones: green agate, amethyst, crystal quartz, black agate, tiger eye, rose quartz, and sodalite. Flip it around to show off the solid side or the 18k gold-plated honeycomb cover. You can even add a photo of a loved one to wear as a locket—the effect is particularly special with the clear quartz stone.