The golden girl leaves no stone unturnedYellow gold is more expensive than ever, but for ­Temple St. Clair Carr, its value goes well beyond price. The metal has been a mainstay of her wide-ranging line since its beginnings in 1986 in Florence, Italy. Not that she doesn’t mix it up: To craft her medieval-inspired amulets, delicate earrings, and statement rings—which appeal to self-purchasers (e.g., a $575 rock crystal egg amulet) and special-occasion givers alike (an 18k cuff with moonstone, rubies, and diamonds goes for $42,000)—she relies on crystal, tourmaline, moonstone, colored sapphires, and diamonds. One material she’ll never use: coral. (The designer is a proud supporter of the “Too Precious to Wear” ­campaign.)  Age: AgeLESS!Number of years in the biz: 25 plusNumber of employees you oversee: 25 and growing Maximus the puppy Family/pets: Husband and