Solitaire Diamond Price Guide 2026: What a Solitaire Actually Costs

A solitaire costs what its center stone costs, plus a setting that rarely moves the total by more than a tenth. StoneAlgo recorded May 2026 lab grown averages of 564 USD at 1 carat, 1,265 USD at 2 carats, 1,865 USD at 3 carats, and 2,588 USD at 5 carats. Those are loose stone figures, before any metal touches them.

Read the per carat column carefully. The rate falls as weight rises, from 866 CAD per carat at 2 carats down to 709 CAD per carat at 5 carats. Buying weight in one stone is cheaper per carat than buying it in pieces. That single fact is the entire economic case for the solitaire. The full rate table sits in the lab grown diamond price per carat analysis for 2026.

Because a solitaire setting is a band and four to six prongs. There is no pavé to buy, no halo of 30 melee stones, no side stones. Metal weight in a standard solitaire shank is a few grams.

The arithmetic is public on both sides. The May 2026 loose average for a 2 carat lab grown stone converts to about 1,733 CAD. Draco's 2.25ctw radiant cut solitaire, IGI certified and VS2 and better, lists at 1,899 CAD. The finished ring sits within roughly 10 percent of the raw stone benchmark. That gap covers the metal, the setting labor, certification and the guarantee. It does not cover a second category of diamonds, because there is not one.

This ratio is why solitaire prices track the diamond market so tightly. Wholesale lab grown fell roughly 74 percent between 2020 and 2025 according to Edahn Golan Diamond Research, and a finished lab stone now costs 80 to 90 percent less than its mined equivalent by BriteCo's measure. In a ring where the stone is 90 percent of the cost, that decline passes almost straight through to the price on the tag. In a heavily accented ring it does not, because more of the ticket is labor and small stone setting.

One caution. The floor has arrived. StoneAlgo's year over year decline narrowed to 2.59 percent, the smallest quarterly moves in two years, and premium certified stones have hit a production cost floor. Waiting another year to save on the stone is no longer a strategy. What a fair number looks like today is covered in how much you should pay for a lab diamond in 2026.

At Draco, no. Each ring carries one listed price across the full metal range, silver, 10K, 14K and 18K gold, and platinum. Metal is selected on the order rather than priced as a separate variant.

That matters more than it sounds. At a traditional jeweler the metal upgrade is a standard second sale, and platinum can add several hundred dollars to a ring whose diamond has already been marked up. When metal is included, the only variable left in a solitaire is the stone, which is exactly where a buyer should be spending attention. Color of metal is a styling decision, not a budget decision. The full comparison of white, yellow and rose is in the lab diamond shapes guide for 2026, which also covers how shape changes the size a given weight appears on the hand.

Shape does move the price of the stone itself. Elongated cuts such as oval, marquise and radiant present more surface area per carat than a round brilliant, so they read larger on the hand at the same weight. Round remains the reference point that the loose averages above are built on.

Yes, and the margin is wider than most buyers expect. Here are three live Draco rings at comparable total weight, all IGI certified, all regular non sale prices verified July 21 2026.

The solitaire is 389 CAD below the halo and 521 CAD below the three stone, and it puts more of its weight into a single visible stone. A halo spreads carats across a ring of melee that reads as one larger stone from a distance and as many small stones up close. A three stone splits weight three ways by design.

None of that makes halo or three stone a bad purchase. It makes them a different purchase. If the goal is the largest certified single stone for a fixed budget, the solitaire wins on arithmetic every time. Whole ring budgets by style are broken down in the 2026 lab grown diamond engagement ring cost report.

Spend where the eye lands. In a solitaire that is carat weight and cut, in that order, with color and clarity held at the point where flaws stop being visible.

Two spending mistakes recur. The first is paying for clarity above VS2, which buys a distinction invisible without magnification. The second is paying for D color when E to F is colorless to the eye in a mounted stone. Draco holds the catalog at E to F color and VS2 and better for exactly that reason. To specify a stone and setting yourself, the Draco ring builder prices the combination directly.

Four steps, about ten minutes, and it works on any seller.