8 of the most expensive jewels hitting the auction block at Christie's, from a $5 million diamond necklace to 53-carat sapphire ring

One of the diamonds expected sell during Christie's auction on July 29.Christie's

• Christie's "Magnificent Jewels" auction, where diamonds from brands like Bulgari and Cartier are expected to sell for millions, is launching today, July 29.
• The auction house is also hosting its "Jewels Online" sale, which is set to last from July 22 to August 7.
• The Magnificent Jewels sale is being led by a 115.83-carat diamond necklace that is expected to sell for between $5 million and $7 million.

Diamonds are a girl's best friend — but so are sapphires, rubies, and emeralds.

And UK-based Christie's knows this — which is why the world-famous auction house is hosting its "Magnificent Jewels" auction on July 29, part of a larger "Jewels Online" sale set to last from July 22 to August 7. Including a selection of over 260 jewels from the likes of Bulgari, Cartier, Harry Winston, and Tiffany & Co., all are expected to sell for big bucks: The auction estimates for each lot range from $10,000 to $7 million, according to a press release.

The "Magnificent Jewels" sale, launching today, is led by a selection of white diamonds — including a 115.83-carat pear-shaped diamond necklace, expected to sell for between $5 million and $7 million. Other diamonds hitting the auction block include a blue 7.16-carat ring (estimated to sell for between $3.5 million and $5 million) and a 33.65-carat yellow diamond ring (estimated to go for $525,000 to $625,000).

But of course, out of the 260 pieces on offer, these three diamonds are just a small selection of the available lots.

Here are 8 of the most expensive pieces expected to sell at Christie's "Magnificent Jewels" auction, listed in order of ascending estimated auction price.