Katie Cassidy, Her Jewels, Harry Kotlar Diamonds. This star wore Harry Kotlar D flawless diamond cluster earrings worth $1 million at 87th Annual Academy Awards. Harry Kotlar is recognized as the premier source for the highest quality diamonds, its hallmark design – Artisan Pave and “the world’s most brilliant Cushion Cut diamond” – Kotlar Cushion. Spanning six decades of beauty, art and perfection, Harry Kotlar’s designs evoke old-world artistry with modern sophistication, creating stunning diamond rings, bands, earrings, bracelets and necklaces that celebrate individuals’ story eternally.