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CARAT JUICE: While she arrived bright and early at the Cartier mansion on Thursday morning to help launch a new Cartier Trinity Charity bracelet to benefit the charity ServiceNation, Demi Moore made it clear the bracelet isn’t her favorite piece from Cartier — as she flashed a megawatt emerald-cut diamond ring given to her by husband Ashton Kutcher. “It’s vintage Cartier,” the actress said coyly. Moore is an advocate for ServiceNation, a coalition of 190 nonprofit organizations that seek to expand opportunities for Americans to volunteer for national service. The limited edition Trinity charity bracelet is made of yellow, white and rose gold with diamonds, comes on either a red, white or blue silk cord and goes on sale for $1,700, with $350 going to ServiceNation. “Cartier has been supported by America for 100 years,” said Frédéric de Narp, president and chief executive of Cartier North America, who was joined by Bernard Fornas, president and ceo of Cartier International. “We want to entice Americans to give back.”