Meghan Markle could wear a custom-designed tiara worth nearly $700,000 on her wedding day - here's how much the tiaras of other British royal brides are worth

• The world debates whether Meghan Markle will wear a tiara during her wedding to Prince Harry.
• Queen Elizabeth II has one of the world's best jewel collections from which to loan Markle a tiara.
• It's speculated the future Her Royal Highness Princess Henry of Wales could wear the Strathmore Rose Tiara or the Spencer Tiara.
• Markle could also wear a custom-designed tiara, which one expert says would cost about $687,360.

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Will she or won't she?

Besides the wedding dress, one of the biggest speculations regarding the wedding of Prince Harry and Meghan Markle is whether the future Her Royal Highness Princess Henry of Wales will walk down the aisle at Windsor Castle in true royal fashion - donning a dazzling tiara.

If Markle does opt for this regal look, she has plenty of diamonds and gems to choose from. Queen Elizabeth II has a famed, well stocked royal collection of tiaras - one of the best in the world.

The Queen lent the Queen Mother's Cartier Halo Tiara to Kate Middleton as a "something borrowed" for the Duchess' wedding to Prince William. If tradition dictates anything, she'll also loan a princess' ultimate treasure to her future granddaughter-in-law.

While it's not expected that Markle will wear the same tiara as the Duchess of Cambridge, rumors are circulating about what possible tiaras she could wear - such as the Strathmore Rose Tiara or Princess Diana's Spencer Tiara. The latter would be fitting considering Markle's engagement ring contains two diamond stones from Princess Diana's collection, and that she and Harry plan to honor his mother on the big day.

Then again, she and Harry are a modern-day couple - she could also have her own tiara made for her.

Whether Markle goes for an heirloom tiara or a custom tiara, there's no denying the jewels and metals that will sparkle atop her head go for a pretty penny.

We took a look at some of the most famous weddings in the British royal family and their equally famous tiaras - and just how much those tiaras might be worth.