Startled, Crystal dropped the sonic screwdriver. It clattered by her feet and she stared at the Doctor for a long moment. Then, she retrieved the device she'd just dropped and began examining it busily. As she turned it over and over in her hands, she spoke.
"It..." she stammered. "Well, how much does it really mean, Doctor? I mean, for all we know, one of your people could have discovered me as a baby, placed the necklace with me and left me where they knew I'd be cared for..."