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Radiant cut black diamond engagement rings combine a rectangular outline with cropped corners — a durable, modern shape that suits solitaire and three-stone settings in black. Every ring is made to order in 14K or 18K gold or platinum, with natural or treated black diamond — or black moissanite — in the carat you choose.
Black diamond buying guide & FAQ
Are black diamonds real diamonds? Yes. Black diamonds are genuine carbon diamonds whose color comes from dense dark inclusions (natural) or from treatment. They measure 10 on the Mohs scale, the same as white diamonds, so they are suitable for daily wear.
Natural or treated black diamond — which does Segal use? Both are available. Natural black diamonds are rarer and cost more; treated black diamonds are natural diamonds darkened by heat or irradiation and look identical to the eye. Black moissanite is offered as a lower-cost alternative on most designs.
How much does a black diamond ring cost? Typically less than a comparable white diamond. Segal's black diamond rings start around $1,000 and rise with carat weight, metal, and setting complexity. Every ring is made to order in 14K or 18K gold or platinum.
Radiant vs emerald cut black diamond? Both are rectangles with cut corners; a radiant has brilliant-style facets (more surface texture), an emerald cut has long step facets (a sleeker mirror look).
Can I add white side stones? Yes — trapezoid or baguette white diamonds either side of a radiant black diamond is available as a custom option on request.
Custom-made in the USA · lifetime warranty · free resizing · free shipping · 30-day returns · updated 2026. See the complete black diamond guide.
