Veil and Jewellery
The veil is made of layers of soft, ivory silk tulle with a trim of hand-embroidered flowers, which was embroidered by the Royal School of Needlework. The veil is held in place by a Cartier ‘halo’ tiara, lent to Miss Middleton by The Queen. The ‘halo’ tiara was made by Cartier in 1936 and was purchased by The Duke of York (later King George VI) for his Duchess (later Queen Elizabeth The Queen Mother) three weeks before he succeeded his brother as King. The tiara was presented to Princess Elizabeth (now The Queen) by her mother on the occasion of her 18th birthday.
The Bride’s earrings, by Robinson Pelham, are diamond-set stylised oak leaves with a pear shaped diamond set drop and a pavé set diamond acorn suspended in the centre. Inspiration for the design comes from the Middleton family's new coat of arms, which includes acorns and oak leaves. The earrings were made to echo the tiara. The earrings were a personal gift to the Bride from her parents for her Wedding Day.
Robinson Pelham have also designed and made a pair of diamond earrings for Miss Philippa Middleton. These earrings are more floral in nature to compliment the headpiece worn by Miss Philippa Middleton during the Service.
A tourmaline and diamond pendant and matching earrings have been designed and made for Mrs. Carole Middleton. Two gold stick pins, one with a single gold acorn at the head and the other with an oak leaf, are also worn respectively by the Father of the Bride, Mr. Michael Middleton, and the Bride's brother, Mr. James Middleton.
So it seems the official line is that it is the Halo Tiara.