What do VVS1, D and Excellent mean on this bracelet?

They are diamond grades. VVS1 means very, very slightly included, with inclusions hard to see even under magnification. D is the highest colorless grade, and Excellent is the top cut grade for light return.

Is a 9-inch bracelet too long for a small wrist?

Nine inches is longer than a typical women's bracelet, which usually runs about 7 to 7.5 inches. On a small wrist it will sit loose and slide down the arm rather than stay put.

How does this compare with a standard diamond tennis bracelet?

The difference is the grading. Many tennis bracelets use lower clarity and color, such as SI or I color. This one is specified at VVS1 and D, so the stones should face up whiter and cleaner.

What is the total diamond weight?

1.4 carats across the bracelet. That is the combined weight of all the stones, not the weight of a single diamond.

Does it come with a certificate for the diamond grades?

No grading report is stated. The VVS1, D and Excellent grades are given in the product details, so ask the seller for documentation if you need certified grading.