The daith is the innermost cartilage fold of the ear, formed where the helix curves inward above the ear canal to create the crus of the helix.
A Storied Heritage
Flat back earrings were developed because standard butterfly backs aren't the best fit for cartilage and helix piercings. The curved surface of the ear creates pressure points that a flush disc backing was specifically designed to eliminate. They're the best gift to give if she has a new cartilage piercing of any type.
Stone Story
Lab-grown diamonds are available from accent sizes through multi-carat center stones. They are commonly grown large enough that they exceed sizes that would be rare in mined production.