One was the sapphire and diamond eternity band she debuted to congratulate Team GB in August, and another was a new eternity ring. While it's not clear where the latter came from, some have mused ...

The sapphire ... cut diamonds in a similar shape to petals. The stones were designed to resemble a rosebud in honor of her middle name Rose and the sentimental engagement ring was set in platinum ...

According to Steven Stone, the ring is worth £1,500 and features 0.23ct diamonds. The pave set eternity band typically sits alongside her iconic sapphire engagement ring and Welsh gold wedding band.

Kate stunned in a brown and burgundy ensemble, but she appeared to have ditched her £300,000 engagement ring and opted for her £1,500 eternity ... her sapphire and diamond engagement ring ...