The list from Franck, friend and history jewel lover, from the History of Famous Jewels and Collections Board.

The where about

I. Former Queens :

a. Queen Adelaide :

Queen Adelaide’s diamond collet necklace

II. Queen Alexandra
a. Certainly in the vault
i. Queen Alexandra’s Lalique hair ornament (Suzy Menkes) ;
ii. The huge badge from the Ladies of South Wales
iii. The opals from the ruby and diamond parure

b. Mysteries
i. A short of diamond crown worn at the Devonshire ball
ii. The hair combs with huge diamonds worn with the small diamond crown from Queen Victoria
iii. The huge diamond necklace (left side in the link)
iv. Several diamond collet necklaces (on least one with huge diamonds)
v. A second Cartier Resille necklace
vi. A huge pearl and diamond necklace
vii. A ruby diamond choker & bangles – gift of the ladies of South Australia in 1889
viii. The demi-parure of opals – wedding gift – Queen Victoria
ix. The diamond earrings given as a wedding gift by the Corporation of the City of London
x. The diamond stars brooches
Xi. Emerald and diamond flower brooch from HRH The Duchess of Cambridge maybe in the NRC

III. Queen Mary

a. Certainly in the vault :

i. The lozenge tiara – last worn by Princess Margaret ;
ii. The sapphire and diamond tiara – last worn by Princess Margaret -certainly in the vault
iii. The pearl and diamond stomacher
iv. The Delhi Durbar emerald and diamond stomacher
v. The Cambridge emerald and diamond bangle
vi. The Resille Cartier necklace
vii. The ruby and diamond brooch from the Countess of Torby (Andrew Morton)

b. Mysteries :

i. The laurel wreath/leaves tiara worn by Princess Mary the Princess Royal
ii. 8 important collet necklaces : the fate of 4 of them – No information of the others 4
iii. On least 2 small collet necklaces worn with pendants at operas, theatres…
iv. The diamond collet necklace wedding gift from the Prince and the Princess of Wales
v. A diamond fringe necklace worn for several portraits
vi. The ruby and diamond hair comb
vii. The ruby and diamond choker
viii. The sapphire and diamond choker -found by Beth
ix. Ropes of pearls
x. The long feather diamond brooch from Empress Eugenie of France
xi. Big sapphire and emerald brooches
xii. The ruby, emerald and diamond brooch from Princess Helena
xiii. The huge amethyst and diamond brooch worn with the amethyst parure

c. Wedding gifts :

i. Diamond necklace from the Duke of Westminster used as diamond band
ii. A Forget me not Diamond pearl Aigrette
iii. A pearl and diamond comb – Sir G. and Lady Lucas
iv. The feather diamond aigrette from the groom
v. A five-row pearl necklace given by her husband
vi. a peridot, ruby and diamond peacock feather brooch with a small bow from the Ex-Queen Isabella of Spain
vii. Others wedding gifts…

viii. A diamond arrow brooch from Earl and Countess of Dudley

IV. Queen Elisabeth the Queen Mother

a. Certainly in the vault

i. The Duchess of York’s diamond necklace ;
ii. A long diamond sautoir worn as Duchess of York
iii. The emerald and diamond necklace from Mrs. Ronald Greville
iv. The emerald and diamond long sautoir from Mrs. Ronald Greville (Press articles from Beth)
v. A pearl and diamond sautoir, consisting of five rows of pearls, mounted on fine platinum wiree with a large pearl drop>> from the Citizens of London
vi. A pearl and diamond platinum sautoir necklace, emerald and diamond tassel and pearl fringe, by Catchpole & Williams
vii. Several pearls necklaces
viii. The Ruby Greville bow brooch
ix. Princess Marie Louise’s oval sunburst pendant brooch

x. The emerald and diamond bracelet from Queen Alexandra
xi. The diamond snake bracelets from Queen Alexandra and her mother
xii. The ruby bracelets
xiii. The emerald bracelets

b. Mysteries i.

A sunburst diamond brooch pendant, the stones being set in the form of a sunburst Engagement present from Queen Mary
ii. a pendant of sapphire and diamonds – together with the Queen (Not seen)
iii. a rope necklace of pearls and diamonds from her father (not seen)
iv. a pearl and diamond bracelet to match from her mother – wedding gift (Seen) From Beth
v. A ruby and diamond ring from the Cora Countess of Stafford (photos from Beth)

vi. A long diamond sautoir worn as Duchess of York worn in Paris for example ; (Found by Beth and Franck) (Press articles)

vii. A long sapphire and diamond sautoir from Sintzenich (From Baxter or Boffer) ; 

viii. A sapphire and diamond necklace – wedding gift from Queen Mary 

ix. A gold chain with diamond drops surmounted with ruby – will from her Godmother Mr. Arthur James (press articles found by Beth on her site)

c. Brooches not worn
– The scent-bottle and true-lovers knot in diamonds from Miss Alice de Rothschild (Wedding gift to Queen Mary) (worn as a Duchess)
– A small diamond horseshoe brooch (gift from Queen Mary) probably later owned by Princess Charlotte in 2022
– A small diamond arrow brooch (worn as a Duchess)
– A large diamond clips worn for a portrait near a door
– An emerald and diamond arrow brooch (Wedding gift from her Godfather)
– An emerald and diamond brooch (Given as an anniversary wedding gift from her husband)
– An emerald and diamond clips worn also as a clasp of pearl necklace
– A emerald and diamond pendant brooch
– A sapphire corsage brooch given as a wedding gift by Queen Mary
– A sapphire and diamond bar brooch – wedding gift from the Princess Royal and Princess Maud

II. Princess Diana’s wedding gift : 

a- (number 25°) :Prince Charles does have a property abroad (acceptance of a 360 000 pounds holiday palm beach as a wedding gift created a political storm“  from Andrew Morton