Just ran through the book to see how many items of jewellery are designated that way. As I mentioned once before much lower down, I like that expression which Roberts uses in the book.
This is not a scholarly work but simply the way I take notes. When posting anything about a jewel I would consult the QD book itself at the time before writing.
(a) Diamond Diadem - page 24 note 1 - “it was among the Crown heirloom jewellery returned by Queen Adelaide to Queen Victoria on 3 July 1837” (b) Queen Adelaide’s Fringe Necklace - page 28 - “considered Crown property”, “considered heirlooms of the Crown”; page 32 - “bequeathed to the Queen” (c) Queen Adelaide’s Brooch - page 34 - “With other heirlooms of the Crown it passed to the Queen from Queen Elizabeth after the death of King George VI in 1952.” (d)Queen Victoria’s Bracelet - page 44 - twice in inventories as an heirloom of the Crown [Not - Queen Victoria’s Fringe Brooch - page 48 - “As a personal jewel, the brooch was left to King Edward rather than as an heirloom of the Crown.”] (e) The Coronation Necklace - page 52 - Queen Victoria designated it as an heirloom of the Crown. (f) The Coronation Earrings - page 59 - Queen Victoria designated these as heirlooms of the Crown (g) Queen Victoria’s Bow Brooches - page 60 - left by Queen Victoria as an heirloom of the Crown (h) Queen Victoria’s Wheat-ear Brooches - page 64 - heirloom jewels handed over to Queen Victoria and designated as such twice by Queen Victoria (i) Queen Victoria’s Golden Jubilee Necklace - page 70 - Queen Victoria designated it too (j) Queen Victoria’s Diamond Jubilee Brooch - pag 74 - Queen Victoria designated it too (k) Queen Alexandra’s Dagmar Necklace - page 98 - “It was bequeathed by Queen Alexandra as an heirloom of the Crown”.