size: 17 inches weight:1.27 grams material: platinum gemstones: natural brownish yellow diamond, I clarity 0.90ctw Notes from the Curator This platinum solitaire holds a 0.90-carat natural brownish yellow diamond in a six-prong setting, a traditional arrangement that balances security with maximum light entry. Yellow diamonds owe their color to nitrogen impurities that found their way into the carbon crystal structure during formation, a process that took hundreds of millions of years; secondary hues like brown are common, and this stone's brownish cast places it in the realm of fancy color diamonds that bridge the spectrum from pure yellow to warm cognac. The discovery of Australia's Argyle Diamond Mine in 1983 transformed brown diamonds from commercial-grade industrial stock into coveted natural-color gems, earning them a place in luxury jewelry showcases worldwide by the late twentieth century. Six-prong platinum settings maximize the stone's brilliance while protecting its girdle, and platinum's natural white luster does not compete with the diamond's golden-brown warmth. The 17-inch platinum chain offers a discreet foil, placing the stone's earthy radiance squarely at the collarbone.