Ruby Jewellery: Choose the Stone First, Then the Piece

The stone. Ruby can command the highest price per carat of any coloured stone, and colour decides most of it. The most valued rubies are red to slightly purplish red, medium to medium-dark in tone, with vivid saturation. More orange or more purple, they are worth less. Too dark, they lose brilliance. Too light, they stop being ruby and become pink sapphire.

Mass-market jewellery almost always uses small calibrated stones of average quality, priced per stone rather than judged one by one. Fine rubies go into one-off, handmade pieces. Both are honest. They are just not the same purchase, so ask for the price of the stone apart from the gold.

For a loose ruby of 1 to 2 carats, the sellers we read on 7 October 2026 typically asked $1,170 to $6,020 a carat heated, and $2,110 to $6,790 unheated. Asking prices, not sale prices. The full grid and how to read it: ruby price per carat.

Ruby rates 9 on the Mohs scale, one step under diamond, and its toughness is usually excellent. It counts among the best ring stones there are, so it can go into any piece, a ring worn every day included. What changes from piece to piece is the life the stone will lead.

Matching is where earrings and line bracelets get demanding. In a set, consistent colour, cut, clarity and size matter especially, and good matching is part of what makes a ruby suite valuable. Look along the row: the reds should agree.

On a ring, a closed bezel shields the whole edge. It also hides the side of the stone, which is where an assembled stone shows its join. So for a bezel-set ruby, get its identity and treatment in writing. Settings and resizing are covered in our ruby engagement ring guide. Yellow gold or white metal is taste: hold the stone against both, in daylight, before you choose.

Assume heat. Almost all rubies today are heated, up to 95 percent by experts' estimates, and heating can go undetected. The trade accepts it: a heated ruby is still a natural ruby.

Further down, the value drops. Rubies with colour diffused into their surface, or with fractures filled with lead glass, are worth less than heated rubies, and high heat and chemicals can damage fillings. Then come stones that are not natural ruby at all. Synthetic ruby, on the market since 1902, has essentially the same properties and costs less. Imitations run from red glass to natural stones sold as ruby, like garnet or red spinel, and assembled doublets.

None of that is wrong to sell. It is wrong to sell unnamed. Ask for the treatment in writing and, for a ruby that matters, a report from an independent laboratory. How to tell a ruby from its look-alikes: our natural ruby guide. And what pigeon's blood really proves.

Warm, soapy water is always safe. Ultrasonic and steam cleaners are usually safe for untreated and heated rubies, never for fracture- or cavity-filled ones: a filled stone gets a damp cloth, nothing more. One more reason to know the treatment before you decide.

At the jeweller's, say it is a ruby and say how it was treated. Soldering flux containing boron, and firecoat made with boric acid, will etch the surface of even an untreated ruby. At home, store each piece apart: a ruby scratches any softer stone it rubs against.