After fiddling with the stem of his glass for a few seconds, he looked straight at her and said:

Her fingers played nervously with the stem of her glass.

He studied the way her fingers tightened around the stem of her glass.

Ruth clutched the stem of her glass and drank fiercely.

He noted that at his words her fingers stopped toying with the stem of her glass.

Her hand had gone limp on the stem of her glass before she managed to shift away.

"I love it," she said, her fingers tight on the stem of her glass.

Uncomfortable, she shifted and began to toy with the stem of her glass.

See the way she's running her fingers up the stem of her glass.

He twisted the stem of his glass in his fingers.