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Princess cut black diamond engagement rings — a sharp square black stone with modern, geometric lines. Also known as a square black diamond ring. 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.
Are the corners of a princess cut black diamond fragile? The pointed corners are the most vulnerable part of any princess cut; Segal protects them with V-prongs or a bezel setting.
Princess cut vs emerald cut black diamond? A princess is square; an emerald cut is a rectangle with step facets and cropped corners. Both read as bold geometric shapes in black.
Custom-made in the USA · lifetime warranty · free resizing · free shipping · 30-day returns · updated 2026. See the complete black diamond guide.
