In general, the jewellery I own is costume stuff. I love statement necklaces, plastic bangles, little treasures I’ve picked up on my travels abroad and diamante bling. Most of my jewellery has sentimental, rather than actual value. But there is an exception to the rule. I love pearls. Pearls are the birthstone for June, they are a jewel that always looks pretty but with an edge of cool, Marianne Faithful, Marilyn Monroe and Madonna are just some of the icons who have worn pearls to make a fashion statement. Pearls are a style classic, always current, and always a statement. American Company Pearl and Clasp have a fantastic range of…