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Round black diamond engagement rings — the classic silhouette in a bold color. A round black diamond reads as a solid, polished black dome, which makes it the most versatile cut for halos, solitaires and three-stone settings. 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.
Does a round black diamond sparkle? Black diamonds are opaque, so they show a polished metallic luster rather than white-diamond fire. A halo of white diamonds adds the sparkle around the stone.
What carat looks best in a round black diamond? 1 to 2 carats is the most popular range; because black diamonds cost less per carat, many customers choose a larger center stone than they would in white.
Can I try the ring on before I buy it? Yes. For $199 Segal 3D-prints an exact replica of any ring design in your finger size so you can try it at home. You keep the replica, and the full $199 is credited toward the real ring (orders $1,000+, credit never expires). See Try It In Real Life.
Custom-made in the USA · lifetime warranty · free resizing · free shipping · 30-day returns · updated 2026. See the complete black diamond guide.
