"Emeralds are elusive," said Robert Weldon, a colored-stone expert at the gemological institute.
"What's so desirable is that they are elusive," says Churchill.
But sometimes that spark is elusive," says Mr. Foreman, who says his company splits all revenue with its inventors.
Perhaps that's why, here in Washington, it's been so elusive," said Barack Obama on June 9th.
She is notoriously difficult to capture as elusive, says Ms Tomalin, as a cloud in the night sky.
A series of drug-laden planes make the loop from South America to the Sahel, but numbers are elusive, said Alexandre Schmidt of the United Nations drug office.
"Agreements of this nature are rarely perfect, and the complexities of the issues will always make unqualified support elusive," said John Allan, president of the group.
"They're a special bird to see whenever you see them because they're so bright and they're so elusive," said Marie Winn, a writer and birder who mentioned its arrival on her blog a week ago.
"Six years after the world economy emerged from its broadest and deepest postwar recession, a return to robust and synchronised global expansion remains elusive," said Maurice Obstfeld, the IMF's economic counsellor.
Figures, as opposed to anecdotal evidence, on DIY dentistry and the black health economy are elusive, said John Wildman, professor of health economics at Newcastle University, because health data is gathered by surveying patients or GP surgeries.
