Well... just this. Men's Shaquille O'Neal 15.0mm Faceted Square Onyx Ring in Two-Tone Stainless Steel. I am off-put by the use of stainless steel, but I do like onyx.
Men's Shaquille O'Neal 15.0mm Faceted Square Onyx Ring in Two-Tone Stainless Steel - Size 10.5 - View All Rings - Zales

Men's Shaquille O'Neal 15.0mm Faceted Square Onyx Ring in Two-Tone Stainless Steel - Size 10.5 - View All Rings - Zales