Singer Nelly Furtado’s engagement ring from Beau Demacio Castellon is an ode to the most popular diamond, the round brilliant cut. This simple and classic shape has been thoroughly researched, and it cut to optimize the fire and brilliance in the stone, making it a top choice for brides.

Mark Schneider - A 1-carat semi-bezel-set center stone is surrounded by 17 round brilliant-cut pave-set diamonds totaling .24 carats. Available in 18kt white gold or platinum. (, starting at $2,487 without center stone)