Jewellery designer Dara Dubinet has designed a $27,000 [GBP18,000] black Chinese agate rock ring for Britney Spears to wear to the Grammy Awards in February [09].

Dubinet started work on the huge gem after she spotted Spears wearing a Tourmaline ring she had created and sent to the pop star when she appeared on U.S. morning show Good Morning America on her 27th birthday in December [08].

The designer tells Life and Style magazine she was told Spears “loved” her birthday gift.

And a source tells the publication, “She’s worn it several times, She says it has a positive energy, and it just makes her smile.”