How can I find the lost birthstone earrings that were a gift from my mom?

If you were outside, look for them with a flashlight in the dark, watching for the reflection from the gemstones. During the day, you might catch a sparkle if there is bright direct sunlight. If you are not sure where you might have lost them, have your family and friends assemble a timeline of all of your activities for the night -- sometimes this can trigger a subconscious recollection of when and where they became lost.