K14 Natural Stone Earring (Single) Unused Made in Japan

After purchase, I stored it in a jewelry case with other items, but I lost one earring.
I can include silicone earring backs if you'd like.
It has a k14 stamp.
Length is approximately 25mm.
Natural stones, likely rose quartz, quartz, citrine, and peridot, but I'm not certain about the top two stones.