The bracelet is made of three strands of white pearls, and at least six diamond halo spacers. From what is visible in the photo there are at least two rows of diamond spacers on the bracelet, three spacers on each row.
While out clubbing in May 2007, Kate was seen wearing this costume jewelry bracelet.
The closeup shows us that this is a stretchy cuff-style bracelet that is divided into square sections. Each segment is connected to the others by stretch cords. The bracelet is primarily black with white polka dots arranged across it in a neat three row pattern, two dots per row. There are 6 white dots on each segment.
Kate has borrowed this bracelet more than once from Queen Elizabeth.
It was gifted to QEII from Prince Phillip when they were married in 1947.
Prince Phillip dismantled his mother’s tiara (she was Princess Andrew of Greece and Denmark) and used the diamonds (set in platinum) to make a new bracelet. It certainly has a Grecian influence: the motif is primarily geometric and angular.
Queen Elizabeth II has worn it for portraits and other significant events.
Widely believed to be part of a suite of jewels gifted to her when she got married, Kate debuted this stunning bracelet during the 2014 NYC trip. She paired it with her ink-blue Jenny Packham gown at the St. Andrews gala.
The bracelet is made of two rows of diamonds (white and yellow) strapped to a center stone consisting of a large emerald set in a square-cut diamond setting. I am assuming this has a foldover clasp. This could be set in either white gold or platinum.
Here it is on Kate.
I believe this is a wedding gift. It has a matching pair of earrings and it’s a very extravagant piece (Kate’s taste in jewelry is not extravagant). This has not been identified for a designer yet, but I have a feeling this could be from a Middle Eastern royal. It reminds me a lot of what Princess Diana received when she got married in 1981.