An engineer by training, jewelry designer Nigel O’Reilly is drawn to precision. His opulent designs, including the Hemisphere ring, push the limits of creativity and scale.&nbsp; <a href="https://www.sothebys.com/en/buy/luxury/jewelry" rel="noopener noreferrer" target="_blank">All Jewelry</a>

Nigel O'Reilly

Centering a rectangular fancy cut topaz, accompanied by pavé set brilliant cut rubies, sapphires, pink sapphires, diamonds and blue diamonds. <ul><li>Topaz weighs 11.90 carats, cut by Erwin Springbrunn</li><li>Accent stones weighing a total of 2.18 carats</li><li>18 karat white gold</li><li>Total weight 8.38 grams</li><li>Size 7½</li></ul>

White Gold, Topaz, and Gemset Ad Lucem Ring

Centering a sky blue topaz, accented by 731 pavé set rubies, blue diamonds and orange sapphires. <ul><li>Topaz weighs 22.32 carats</li><li>Diamonds weighing a total of 2.51 carats</li><li>18 karat rose gold</li><li>Total weight 15.52 grams</li><li> Size 6</li></ul>

Rose Gold, Topaz and Gemset Persei Ring                                                  

Centering a faceted deep purple cultured freshwater pearl, accented by diamonds.<ul><li>Cultured pearl measures approximately 12.4mm</li><li>Diamonds weighing a total of 3.22 carats</li><li>18 karat white gold</li><li>Total weight 29.2 grams</li><li>Size 6 ½</li></ul>

White Gold, Faceted Cultured Pearl and Diamond Estella Ring

Centering a Lightning Ridge black opal, accented by pavé-set blue sapphires and green diamonds.<ul><li>Opal weighs 5.43 carats</li><li>Accent stones weighing a total of 1.88 carats</li><li>18 karat rose gold</li><li>Total weight 9.73 grams</li><li>Size 7½</li></ul>

Rose Gold, Opal, Sapphire and Diamond Cat's-Eye Nebula Ring

Composed of diamonds, rubies, pink sapphires, orange sapphires. <ul><li>Gemstones weighing a total of approximately 2.70 carats</li><li>18 karat white gold</li><li>Total weight 14 grams</li></ul>

Rose Gold, Diamond, Ruby, Pink Sapphire, Orange Sapphire and Diamond Stardust Earrings

Each set with navette cut aquamarines, accented by pink sapphire and white diamond pavé. <ul><li>Aquamarines weighing a total of 1.95 carats</li><li>Gemstones weighing a total of approximately 1.35 carats </li><li>18 karat rose gold </li><li>Total weight 7 grams</li><li>Measurements 54.50x6.80mm</li></ul>

Rose Gold, Aquamarine,  Pink Sapphire and Diamond Navette Earrings

Centering a fancy cut amethyst, with lattice detailing accompanied by pavé brilliant cut rubies, pink sapphires, orange sapphires, blue diamonds and green diamonds. <ul><li>Amethyst weighs 22.50 carats</li><li>Gemstones weighing a total of approximately 1.75 karats</li><li>18 karat rose gold </li><li>Total weight 13.9 grams</li><li>Size 6 </li></ul>

Nigel O'Reilly

Nigel O'Reilly

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Nigel O'Reilly

Nigel O'Reilly

Nigel O'Reilly

Nigel O'Reilly

Nigel O'Reilly

Nigel O'Reilly

Nigel O'Reilly