Favouritism for Melbourne's premier juvenile race goes on the line in the Blue Diamond Previews at Caulfield.

Impressive Moonee Valley debut winner Tulip holds $9 favouritism in the Blue Diamond Stakes on February 25 and lines up in the fillies Preview on Thursday.

Tulip is the $2.70 favourite for Thursday's race although there has been early support for some of her rivals.

Limestone, who lowered the colours of Black Caviar's daughter Oscietra at Flemington on January 1, has firmed from $4.60 to $3.70 with Straviera tightening from $15 to $11.

Zarpoya, one of four runners from the Robbie Griffiths yard has met with support from $31 to $17.

There has already been some spirited action in the males division with Azazel opening favourite ahead of Wait For No One before their positions switched.

But Azazel has since firmed from $3.60 into $3.20 while Wait For No One, which was backed from $4.60 into $3.20, easing slightly to $3.40.

The Lindsay Park stable of David and Ben Hayes and Tom Dabernig has the leading two Blue Diamond fancies in Tulip and Catchy ($11) with another filly Formality ($17) on the fourth line.