JL Nebula Grey Spinel Ring, 18K White gold, set with 4.08ct Round-cut Grey Spinel and 0.47ct round brilliant natural White Diamonds - VVS quality Please note that the carat weight, number of stones and dimensions of the center stone and/or other stones/diamonds can vary based on the size of the creation you order. If you wish for detailed information, please contact us. SPINEL Despite being much rarer, spinel is a unique gemstone that was often mistaken for top-quality rubies and sapphires. It comes in a wide spectrum of colors, from red to blue, colorless, and everything in between. One famous spinel is the 'Black Prince Ruby,' a massive 170-carat stone that sits above the Cullinan 2 in the British Imperial State Crown. Spinel is perfectly suited for daily wear. For every piece of jewelry, you can always reach out to us for personal advice.