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Oval black diamond engagement rings elongate the finger and look larger per carat than a round. The smooth oval outline suits solitaire, hidden-halo and east-west 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.
Oval vs round black diamond? An oval covers more finger surface per carat and looks slimming; a round is more traditional. Both have no corners to chip.
Is a hidden halo possible with an oval black diamond? Yes — a white-diamond hidden halo under the oval adds sparkle without changing the clean top view. See hidden halo rings.
Custom-made in the USA · lifetime warranty · free resizing · free shipping · 30-day returns · updated 2026. See the complete black diamond guide.
