James Packer’s fiancée Kylie Lim has given the clearest glimpse yet of her enormous diamond engagement ring – and experts believe the dazzling sparkler could be worth as much as $1.2 million.The billionaire casino heir, 58, and his glamorous bride-to-be looked every inch the loved-up couple as they soaked up the European summer aboard his $200million superyacht, IJE, off the Italian Riviera on Thursday.While boarding the 108-metre luxury vessel in the glamorous seaside town of Portofino, the former model inadvertently showed off the eye-catching ring Packer presented to her after the pair confirmed their engagement in March.Jewellery experts exclusively told Daily Mail that the enormous diamond appears to be an exceptionally valuable piece.’It’s looking like it could be an Elongated Cushion Cut, which is incredibly popular at the moment,’ a Class A Jewellers representative told Daily Mail.’The diamond is showing to be quite white so this suggests it’s a high colour and considering James Packer’s profile, it’s likely to be a high clarity… most definitely a natural diamond.’ James Packer’s fiancée Kylie Lim has given the clearest glimpse yet of her enormous diamond engagement ring – and experts believe the dazzling sparkler could be worth as much as $1.2 million. Both pictured The billionaire casino heir and his glamorous bride-to-be looked every inch the loved-up couple as they soaked up the European summer aboard his $200million superyacht, IJE, off the Italian Riviera While boarding the 108-metre luxury vessel in the glamorous seaside town of Portofino, the former model inadvertently showed off the eye-catching ring Packer presented to her after the pair confirmed their engagement in MarchThe expert estimated the impressive stone appears to weigh between 10 and 13 carats, as they suggested its exquisite cut could see it attract a hefty price tag.’With this in mind, it could be approximated to be anywhere from $800,000 to $1.2 million,’ they said.On their outing, Kylie cut a chic figure for the Mediterranean outing in a baby blue halter neck top and matching shorts, accessorising with a designer Pucci shopping bag as she stepped aboard the lavish yacht.The vessel, named IJE after Packer’s three children – Indigo, Jackson and Emmanuelle – has become something of a floating retreat for the billionaire in recent years.The couple, whose on-again, off-again romance dates back to 2017, appeared relaxed as they enjoyed the sunshine alongside friends, including former high-profile financier Hamish Douglass, who was spotted on deck in boardshorts and a hat.The luxury getaway comes as Packer continues to enjoy a happier chapter in his personal life.After speaking candidly in recent years about his mental health struggles and substance abuse, the businessman recently revealed on the Rampart Talks podcast that he is now in a ‘good place.’He has previously credited Ms Lim with helping transform his life, saying: ‘Kylie has been a wonderful influence on my life. I love her very much.’Join the discussionShould billionaires spend millions on engagement rings or invest more in causes that help others?What’s your view? Jewellery experts exclusively told Daily Mail that the enormous diamond appears to be an exceptionally valuable piece ‘It’s looking like it could be an Elongated Cushion Cut, which is incredibly popular at the moment,’ a Class A Jewellers representative told Daily Mail ‘The diamond is showing to be quite white so this suggests it’s a high colour and considering James Packer profile, it’s likely to be a high clarity and most definitely a natural diamond’ The expert estimated the impressive stone appears to weigh between 10 and 13 carats, as they suggested its exquisite cut could see it priced at well over $1 million On their outing, Kylie cut a chic figure for the Mediterranean outing in a baby blue halter neck top and matching shorts, accessorising with a designer Pucci shopping bag as she stepped aboard the lavish yachtAfter rekindling their romance last year, the pair confirmed their engagement in March, with Mr Packer declaring: ‘We are very happy to be engaged and looking forward to the future.’Packer was previously engaged to former Aussie models Kate Fischer, Jodhi Meares, and Erica Baxter, along with US pop star Mariah Carey.He later married Meares and Baxter, with whom he had three children. It is understood Packer and Kylie began dating in 2017 after being introduced by mutual friends in Aspen, where he also co-owns a home with ex-wife Erica Baxter. The couple fuelled engagement rumours in 2019 when Lim was seen wearing a diamond-encrusted sparkler on her wedding finger during a loved-up holiday on his superyacht in Capri, Italy.In 2020, the couple travelled to Sydney to inspect Packer’s $2.4billion Crown Barangaroo casino development being constructed at the time.Packer previously credited Kylie with helping him through a dark period of his life following his messy split with Carey in 2016 and battle with substance abuse.