A photographer at the LA County Museum event catches a clear picture of the ring. (Robert Procop) A photographer at the LA County Museum event catches a clear picture of the ring. (Robert Procop)

Hollywood actress Angelina Jolie and actor Brad Pitt have shown off their engagement with a bespoke emerald- and baguette-cut diamond ring created by US designer Robert Procop.

Procop has been the “private jeweller” to Jolie for more than a decade, last year launching a philanthropic collection called Style of Jolie, created in collaboration with the actress.

Pitt is said to have worked closely with Procop on the design of the engagement ring, which Jolie last week wore in public for the first time during a visit to an exhibition at the LA County Museum.

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Procop has since confirmed he was the designer of the ring, having worked with Pitt “to realise the star’s vision for the ring”. He is said to have sourced a diamond of the finest quality, with the design and making process taking a year to complete with Pitt's influence.

The central diamond is estimated to be about six carats, while observers offer that it could have cost in the region of $250,000 (£157,760) to create.

Procop began work as a jewellery designer in his teenage year, and opened his first store, Diamonds on Rodeo, in the final year of undergraduate study.

He has since created jewellery for American president Ronald Reagan, launched a successful wholesale arm to his company and was also responsible for turning around Asprey and Garrard, re-structuring the brands into two separate entities as their chief executive.