The Albatross
To be honest, I don't think any royal bride would want to wear the Spencer Tiara, even if it were offered. More that any other thing, that Tiara personifies Diana. It is frozen in time along with the image of her wedding.
Picture if you will, William or Harry's beautiful and beloved bride walking up the aisle on the arm of her father, the groom watching from the front of the Cathedral, joy beaming from his face (maybe even a tear a la Prince Frederik) meanwhile the BBC commentator goes into raptures as he/she espies
The Tiara under the veil and rapsodises about how wonderful it looked on Lady Diana on her wedding day, and, oh the bride is taking the groom's hand, and oh, once again I really must say how wonderful and symbolic
the tiara is under the veil, and how magnificent it will look when the veil is lifted, oh and what's that, they're exchanging the rings . . . . very soon we will have our first look at
"Diana's" Tiara, oh, what was the bride's name again?
Forget it! Never happen! Those brides will wear something wonderful and perhaps (if we are really lucky) something historic from the vaults. Something that will be "their own" for as long as they live or divorce.