Pharrell Williams only wears jewellery with healing properties.

The 'Happy' hitmaker recently decided to reinvent both his music and his image and now shuns expensive, oversized bling for precious stones possessing medicinal values which he feels can improve his quality of life.

He confessed: ''For ages, I got it wrong. I was competing with others because I wanted to draw attention to myself. But in the same way as I realised I wanted to put peaceful things in my music, I decided I should only be wearing jewellery with medicinal and holistic properties.

''For example, I wear yellow diamonds or emeralds because those stones have healing qualities, as well as soft water pearls. I don't love jewels for what they represent. I love them for what they express, because they're who I am inside.''

The hip-hop icon and world-famous producer hasn't always been quite so modest when it comes to his accessories.

Pharrell memorably teamed up with luxury fashion house Louis Vuitton in 2008 for a line of fine bling called Blason, which ranged in price from $2,000 to a whopping $621,000.

One thing which definitely hasn't changed, however, is his style. He revealed his love of fashion comes from a desire to express himself and says his bold clothing reflects his outgoing personality.

Pharrell explained in an interview with France's Madame Figaro magazine: ''Clothes are a part of who you are as a person. If you're shy, you're going to wear dark colours, clothing that doesn't emphasise your body. You don't want to draw attention to yourself. If you're more outgoing, your outfits will be more colourful and form-fitting.

''I'm obviously someone who likes colour! ... Every day, I get dressed depending on how I feel inside and how much time I have to get ready.''