A single perfect pearl is so elegant.  Seen as very exotic for a long time, when white pearls were de rigeur, the 90s craze for these shining black gems actually led to them becoming a little bit too common. The good news is that good exemplars of Tahitian pearl perfection are easier to obtain.

This gorgeous ring by pearl masters Schoeffel features a 10-11 mm pearl set off with a spiral of white diamonds set in 18k white gold. It is available from Nigel Milne for £1800.