My favorite - Leigh ** Hunt & Roskell, Tiara with oak leaves and acorns, (source). A convertible piece, the three jeweled portions of this tiara could also be mounted on a brooch frame or tortoiseshell combs which came with the set.
Cairo, Egyptian Royal Family's Jewels shown being examined before being put up for auction. This item is believed to be the tiara worn by Princess Chevikiar. It is today in storage at the Royal Jewellery Museum in Alexandria (Lady Fatma Ismail's Villa)