Engagement Rings · Buying Guide

Alternative Engagement Ring Stones: Diamond Alternatives, Compared (2026)

By Tushar Leclerc · 11 min read

Last Updated: July 27, 2026

---

The classic white round diamond has been the default engagement ring center stone for decades, and for good reason — it is the hardest material on earth and it sparkles like nothing else. But it is no longer the only path to a beautiful, durable ring. More couples are choosing an alternative engagement ring stone, whether to save money, to stand out, or to sidestep mined diamonds entirely.

"Alternative" covers a lot of ground, though, and the options are not equivalent. Some are real diamonds; some are entirely different gemstones. Some rival a diamond for hardness; others scratch far more easily. This guide walks through every realistic diamond alternative, explains how each compares, and helps you match a stone to how you actually live.

Why look beyond a traditional diamond?

Three reasons come up again and again when people search for alternatives to diamonds:

• Budget. A mined diamond carries a steep price per carat. Almost every alternative — a lab-grown diamond most of all — gets you a larger or cleaner-looking center stone for the same spend.
• Ethics and origin. Some buyers would rather not deal with the sourcing questions attached to mined stones. Lab-grown diamonds and lab-created gemstones remove that concern by origin.
• A different look. A pop of color, an unusual shape, or a stone with a story of its own can feel more personal than a colorless round diamond.

Whatever the reason, the smart move is to understand what each alternative actually is before you shop — because "diamond alternative" is used loosely to describe two very different categories of stone.

Two kinds of alternative: real diamonds vs. gemstones

Every alternative engagement ring stone falls into one of two groups, and knowing which is which prevents the most common shopping mistake.

Group 1 — real diamonds, grown in a lab. A lab-grown diamond (also called a lab-created or man-made diamond) is chemically, physically and optically identical to a mined diamond. It is not an imitation. It scores a 10 on the Mohs hardness scale, sparkles the same way, and is graded by the same labs on the same 4Cs. The only difference is that it grew in a few weeks in a controlled facility instead of over a billion years underground.

Group 2 — non-diamond gemstones. Moissanite, sapphire, morganite, emerald and cubic zirconia are all different materials. Some are natural, some are lab-created, but none of them are diamonds. They can be gorgeous and, in the case of sapphire, extremely durable — but they have their own hardness, their own way of handling light, and their own color.

The distinction matters because it drives everything else: price, durability, sparkle and resale. If someone tells you a stone is a "diamond alternative," your first question should be: is it a diamond, or a different gemstone entirely?

Lab-grown diamonds: the closest alternative

If your goal is the diamond look and diamond durability without the mined-diamond price, a lab-grown diamond is the closest alternative there is — because it is a diamond. In 2018 the U.S. Federal Trade Commission removed the word "natural" from its definition of a diamond, formally recognizing that a lab-grown stone is a real diamond.

What that buys you in practice: the same brilliance and fire, the same 10 hardness that shrugs off daily wear, the same IGI or GIA certification — typically at 60–85% less than a mined diamond of matching cut, color, clarity and carat. Every lab-grown diamond at Riona is IGI-certified and set in solid 10K, 14K or 18K gold. For a full side-by-side of grown versus mined, see our lab-grown vs natural diamonds guide.

Moissanite vs. lab-grown diamond

Moissanite is the alternative people most often weigh against a lab-grown diamond, so it deserves a proper comparison. Moissanite is a lab-created gemstone (silicon carbide) — not a diamond. It is very hard, at about 9.25 on the Mohs scale, which makes it a genuinely durable everyday stone.

Where it differs from a diamond is in how it handles light. Moissanite has a higher refractive index, so it throws more of those rainbow "fire" flashes. Some people love that extra sparkle; others find it reads as slightly less diamond-like, especially in larger sizes and bright light. Moissanite is also cheaper than a lab-grown diamond of the same size.

So the honest trade-off is this: moissanite vs. lab diamond comes down to whether you want a real diamond (lab-grown) or you prioritize maximum sparkle and the lowest price (moissanite), and are happy with a different material. One quick note that clears up a common search — is moissanite a lab grown diamond? No. Both can be made in a lab, but moissanite is silicon carbide and a lab-grown diamond is carbon; they are different stones. Riona specializes in lab-grown diamonds rather than moissanite, but if you are choosing between the two, that is the distinction that should guide you.

Sapphire, morganite & colored gemstones

If it is color you are after — not a colorless stone at all — a gemstone center is worth considering. These are true alternatives with a very different look from a diamond.

Sapphire is the standout for durability. At 9 on the Mohs scale it is the hardest option after diamond and moissanite, which makes it a sensible everyday choice. Sapphires are famous for deep blue but occur naturally in nearly every color — pink, yellow, teal, white — and lab-grown sapphire offers the same look for less. As the September birthstone, it carries extra sentiment for a September couple.

Morganite brings a soft peachy-pink that pairs beautifully with rose gold and has become a modern favorite. It is softer, though — around 7.5–8 on the Mohs scale — so it needs a little more care and a protective setting.

Emerald delivers a rich green like no other stone, but it is the most delicate here (7.5–8, often with natural inclusions), so it suits someone who will treat the ring gently.

Riona focuses on white lab-grown diamonds set in gold rather than colored gemstones, so we don't stock sapphire or morganite rings — but if a colored center is what you want, look for a jeweler who specializes in them, and prioritize a hard stone (sapphire) if the ring will be worn every day.

Alternative stones compared side by side

The single most useful column here is hardness. It is what separates a stone that will look sharp in twenty years from one that will slowly scratch and abrade with daily wear.

Durability: what survives daily wear

An engagement ring is worn every day, so hardness is not a technicality — it is the difference between a stone that stays crisp and one that clouds. On the Mohs scale, only a harder material can scratch a softer one, and everyday grit (household dust contains quartz at 7) is the real enemy.

That puts the alternatives in a clear order. A lab-grown diamond at 10 is untouchable by anything you'll encounter day to day. Moissanite (9.25) and sapphire (9) are both excellent everyday performers. Cubic zirconia (8–8.5) looks the part at first but scratches and clouds over a few years, which is why it reads as costume jewelry over time. Morganite and emerald (7.5–8) are beautiful but need a protective setting and gentler treatment. If your hands are hard on jewelry, weight this column heavily.

A non-traditional look with a real diamond

Here's the option most "alternative stone" searches miss: you can have a distinctly non-traditional ring and a real diamond. The round brilliant is only the most common shape — it is not the only one. Choosing a different diamond shape gives you a look that stands apart while keeping the hardness, sparkle and certification of a genuine lab-grown diamond.

An emerald cut reads as architectural and vintage, with long step facets instead of sparkle-heavy brilliance. A pear is soft and distinctive and looks larger for its carat weight. A marquise is dramatic and elongating. A three-stone setting carries meaning — past, present, future — in a way a plain solitaire doesn't. Each of these is a fraction of a mined diamond's price because it's lab-grown, and each is a genuine departure from the default round solitaire.

Emerald Cut SolitaireFrom $1,369 Pear HaloFrom $1,450 Marquise SolitaireFrom $1,087 Oval Three-StoneFrom $1,450 Round SolitaireFrom $1,288

Prefer something no one else will have? We also build custom engagement rings to your shape, setting and carat.

How to choose your center stone

Match the stone to what matters most to you:

• You want a real diamond for less → lab-grown diamond. Same stone, same hardness, up to 85% off mined pricing.
• You want maximum sparkle at the lowest price → moissanite, accepting it's a different material with more rainbow fire.
• You want visible color → sapphire for everyday durability, morganite or emerald for a softer palette with a bit more care.
• You want a non-traditional look but a genuine diamond → a lab-grown diamond in an emerald, pear, marquise or three-stone design.

Whatever you choose, insist on independent certification for any diamond (IGI or GIA), check the stone's hardness against how hard you are on jewelry, and buy from a seller who is transparent about exactly what the stone is.

Frequently asked questions