weight: 0.9 grams material: 18k white gold gemstones: natural diamonds: 0.80ctw, I clarity, H-I color Notes from the Curator The solitaire stud earring in round brilliant-cut diamonds occupies a position at the heart of twentieth-century jewelry design, one that transcends fashion cycles. The modern round brilliant-cut was developed by Marcel Tolkowsky in 1919, when he published his famous book, "Diamond Design," in which he first presented precise mathematical calculations that determined the ideal dimensions and angles for cutting round diamonds to maximize their brilliance and sparkle. 18k white gold starts with a blend of 75% 24k Pure Gold and 25% white metal alloys (commonly palladium or manganese), and once the jewellery has been crafted, the design is then plated in rhodium to provide its recognisably bright white appearance. The 0.80-carat total weight in H–I color and I clarity represents a threshold long favoured in the trade: large enough to register presence without theatricality, matched to hold consistent tone across both stones. This pair, set in the minimalist four-prong or basket mount visible in the images, distils the principle Tolkowsky articulated a century ago—light entering the crown, reflecting through the pavilion, and returning to the eye as fire.