Historic and priceless or fresh and fun, ultra-glam or understated and sophisticated, world-renowned or low-key and local – as long as there has been royalty there has been lavish jewelry [1], and as long as there has been jewelry there have been jewelers. Although the assorted royal ladies favor a variety of companies for their gemstone needs, there are a few who they come back to time and time again – unless they happen to fall from favor . . .
Garrard

Ever since Queen Victoria issued the company with their first Royal Warrant [2] in 1843, Garrard was the jeweler who dealt with the most precious pieces in the royal collection. The oldest jewelry house in the world and was founded in London in 1735, and after they received the royal seal of approval they were responsible for the upkeep of the Crown Jewels, as well as producing many new key pieces for the Royal Family.
Garrard's most important job involved the biggest diamond in the world [3]. The fist-sized, 3,106 carat Cullinan Diamond was discovered in 1905, and it was Garrard's task to break it down to be used in a variety of royal items. The largest stone was mounted on the Sovereign's Sceptre (which monarchs carry at their coronation), and the second-largest was set in the band of the Imperial State Crown, while many of the other stones were used brooches [4] including the heart-shaped Cullinan V (pictured.)
Other key pieces by Garrard include Queen Victoria's Coronation Necklace and Diamond Jubilee Brooch, Queen Mary's Fringe Tiara – which the queen wore on her wedding day – the Cambridge Lovers Knot Tiara [5] – which is the Duchess of Cambridge's new favorite – and the Girls of Great Britain and Ireland Tiara, which is seen on all pictures of the queen that appear on stamps, coins and banknotes.
In 2007 however it was announced by Buckingham Palace that Garrard would no longer be the Crown Jeweler as it was 'time for change', although there had been rumors that the Royal Warrant Holders Association had concerns about the image change the company had undertaken when Jade Jagger was creative director between 2001-2006. Garrard still holds a Royal Warrant from Prince Charles.
G. Collins and Sons

Losing no time in appointing a replacement, the queen selected Harry Collins from G. Collins and Sons as the new Crown Jeweler. Harry had been the queen's personal jeweler since 2000 and he has his own workshop at Buckingham Palace. G. Collins and Sons is also responsible for the Duchess of Cambridge's tanzonite and diamond necklace and earrings.
Mappin and Webb

Luxury, history and style are combined in the pieces designed by the current Crown Jeweler. Since 2012 Martin Swift of Mappin and Webb has held this position, although the company already had a distinguished royal pedigree. They started out as a silver workshop in 1775, and have held a Royal Warrant since 1897. The Duchess of Cambridge has worn a few of the company's pieces including the Empress diamond necklace and earrings, and the Fortune necklace.
Cartier

One very famous jewelry brand is not only a Marilyn Monroe exclamation – "Cartier!" – but has long had a deep connection with royal families around the world. After being founded in Paris in 1847, King Edward VII declared Cartier was "the jeweler of kings and the king of jewelers." The company provided 27 tiaras for his coronation in 1902, and he issued the company with a Royal Warrant. Cartier was a personal favorite of Prince Edward and Wallis Simpson [6], and over the years the royal gifted his love with a platinum panther brooch set on a cabochon sapphire, and golden tiger set with black enamel and emeralds.
There are many, many Cartier pieces in the queen's collection, including the Nizam of Hyderabad Necklace [7] which the queen has lent to Kate on more than one occasion, the Halo tiara which Kate wore on her wedding day, and the Williamson brooch which is a personal favorite of the queen. The diamond-encrusted jonquil flower features a 23.6 carat pink diamond, and Her Majesty wore it for the weddings of her sons Prince Charles and Prince Edward.
Asprey

Kate Middleton's engagement ring is probably the most famous ring in the world [8], thanks to its previous owner Princess Diana. Diana chose the 12 carat sapphire surrounded by 14 diamonds from Asprey back in 1981, and Prince William used it to propose to Kate in 2010. Asprey was founded in 1781 as a silk printer, but soon started producing a range of luxury goods, and Queen Victoria soon granted the company a Royal Warrant. Princess Grace of Monaco's engagement ring was an Asprey piece set with a 12 carat diamond, and Asprey has held a Royal Warrant from Prince Charles since 2013.
Wartski

It's not such a well-known name as some on the list, but Wartski is very important to the Royal Family, as in recent years the company has produced their wedding bands - including those of Camilla and Kate. This means it is likely that when Prince Harry marries, his bride's wedding band will be by Wartski too.
Kiki McDonough

The most dedicated of royal style watchers will be very familiar with the name, thanks to the Duchess of Cambridge's love of her earrings [9] that feature semi-precious stones and diamonds. Kiki started designing jewelry in 1985, and Kate currently has 15 pairs of her earrings. Kate's favorites seem to be the citrine pear drops that she has worn since before her wedding, including on notable occasions such as leaving hospital with Prince George and to his christening. The duchess also favors green amethysts. She has three pairs of earrings featuring the stone, and mostly wears the oval drops with diamonds that are thought to have been a Christmas gift from William. this pair have become Kate's 'Christmas earrings', as she wore them for church on Christmas Day in 2011, 2012, 2013 and 2015.
Heavenly Necklaces

There's a time and a place for whopping diamonds, lavish tiaras and decadent declarations of love, but there are also plenty of occasions when the younger women of the family are happy to employ the services of the online company that was set up in 1998. Kate caused a style splash when she wore a pair of $62 Heavenly Necklace earrings to the queen's Diamond Jubilee Service, but the brand is actually a favorite of Sophie, Countess of Wessex. Sophie has dozens of their pieces in her jewel box, that feature semi-precious stones and imitation diamonds.
Van Cleef and Arpels

Yes family heirlooms are an effective way of expressing love and commitment, but the royals are also keen to start their own traditions with something new. Over the years Prince Charles has gifted his wife Camilla with many of the jewelry houses' finest pieces. Some of the duchess' favorites are a pair of dragonfly brooches - one made from diamonds and the other from sapphires – and the diamond Alhambra drop earrings, that are a symbol of luck.