De Beers - Christmas Morning
Summary: A man surprises his wife on Christmas morning with a gift of a diamond necklace that he had hidden in their grandfather clock.
Music in the commercial
At the Matador Records page for Cat Power, there's a message from 11/29/06 that says:
And yes, that is Chan you hear singing the Cat Stevens song "How Can I Tell You" in the new DeBeers ad. No plans to release it as far as we know, so quit asking.
Lyrics used in the commercial
How can I tell you that I love you
I love you
I long to tell you
That I'm always thinking of you
I'm always thinking of you
But I can't think of right words to say
This commercial might be misconstrued as being a Zales ad, but it's part of the "A Diamond is Forever" campaign from DTC (Diamond Trading Company), part of the De Beers group.