It is large, regal, impressive, and has been worn by not less than five Queens... perfect for a Coronation!
Queen Alexandra wore it (on her right arm) at her Coronation in 1902, and Queen Elizabeth the Queen Mother wore it (on her left arm) for her daughter's Coronation in 1953.
Another possible option would be the pair of King William IV Buckle Bracelets, which were worn by Queen Mary and Queen Elizabeth at their husband's Coronations in 1911 and 1937.
For those not familiar with this pair of bracelets, here is their description in Leslie Field's book The Queen's Jewels: "On King George V's accession to the Throne in 1910, Queen Mary had two blue enamel buckle mounts set as the centrepiece of matching four-row diamond bracelets, one of which was made in 1838 and left to the Crown by Queen Victoria; the other, which had formerly had a lage portrait medallion of Prince Albert, was worn by Queen Victoria every day of her life following her marriage. The buckles had originally belonged to King William IV, and are surrounded by two rows of brilliant-cut diamonds with his cypher of WR surmounted by a crown on one, and that of Queen Adelaide on the other".
Queen Mary with Queen Victoria's diamond bracelet (on her right wrist) and one of King William IV Buckle Bracelet (on her left wrist):
Queen Elizabeth with King William IV's Buckle Bracelets: