Record Ruby, Sapphire and Emerald Prices, Explained

Clients arrive with the record prices in their heads and ask what their stone is worth by comparison. The honest answer is that the records are not a price list. They are a description of what the market does at its very top, on one evening, when a stone of size, a famous name and two determined bidders happen to meet. Read them for what they reward. Do not read them as a valuation.

The rubies

Two stones bracket the ruby market. The Sunrise Ruby, a 25.59-carat Burmese stone set by Cartier, sold at Sotheby’s Geneva in May 2015 for around thirty million dollars, which works out to roughly 1.2 million dollars a carat. That figure is still what the trade means when it says Mogok colour at size is priceless: it is not priceless, it has a price, and the price is that. The Estrela de Fura, a 55.22-carat Mozambican ruby, sold at Sotheby’s New York in June 2023 for a reported 34.8 million dollars, the highest total ever paid for a ruby, at something over six hundred thousand dollars a carat.

Put the two side by side and the whole argument about origin is visible. The Mozambican stone was more than twice the weight and sold for a higher total; the Burmese stone sold for nearly double per carat. What origin does to a ruby is exactly that ratio. The Jubilee Ruby, a 15.99-carat Burmese stone sold at Christie’s New York in 2016 for around fourteen million dollars, sits between them and confirms the curve: smaller, Burmese, and close to nine hundred thousand a carat.

The sapphires

The Blue Belle of Asia, a 392.52-carat Ceylon sapphire, sold at Christie’s Geneva in November 2014 for around seventeen million dollars. The total is the record; the per-carat figure, somewhere above forty thousand dollars, is modest by ruby standards, because size at that scale is the story and colour at that scale is rarely vivid. Kashmir stones tell the opposite tale: much smaller, much higher per carat, with the finest examples trading at levels that only top Burmese ruby exceeds, for reasons I have set out in why origin sets the price. In sapphire the record total and the record per carat are different stones from different mountains, and a buyer should know which record he is chasing.

The emerald

The Rockefeller Emerald, an 18.04-carat Colombian stone, sold at Christie’s New York in June 2017 for around five and a half million dollars, roughly three hundred thousand a carat, then the highest per-carat price for an emerald. Notice what carried it: Colombian origin, a clarity-enhancement line the trade could accept, an old and famous name, and the fact that emerald of that size and colour without significant oil is genuinely rare. Provenance is the one part of a stone that cannot be recut, and at auction it is paid for openly.

What a record actually rewards

Size first, because the price-per-carat curve climbs steeply and stones above ten carats of fine colour are countable. Colour second, at full saturation, with a laboratory appellation the market recognises. The treatment line third: every stone above was unheated corundum or acceptably enhanced emerald with Swiss paper, and a treated stone has never set a record and never will. Origin fourth, confirmed by more than one house. Then the name, the former owner, the maker of the mount, the catalogue essay. And finally two people in the room who each decided not to lose.

What the numbers mean for a private buyer

Three things. First, auction totals include a buyer’s premium of roughly a fifth to a quarter, so the hammer price and the headline differ, and the seller received less again. Second, a record pulls the top of the market up, and the top pulls the certified, unheated middle with it; it does nothing for heated stones, glass-filled stones or stones of uncertain origin, which is why the paper matters more each time a record is set. Third, private trade for a comparable stone of comparable paper usually sits below the auction headline, because the room, the name and the evening are not for sale in an office in Bangkok. The stone is.

The records are useful for one thing above all: they show that at the very top, the market is deep and the buyers are patient. A collector building for value should take the lesson and not the number. Buy the best stone your band allows, unheated, with paper that will still speak the auction language in twenty years. The record will be set by someone else. Your stone will be priced against it.

Questions collectors ask

What is the most expensive ruby ever sold?

By total price, the Estrela de Fura, a 55.22-carat Mozambican ruby sold at Sotheby's New York in 2023 for a reported 34.8 million dollars. By price per carat, the Sunrise Ruby, a 25.59-carat Burmese ruby sold at Sotheby's Geneva in 2015 for around 30 million dollars, roughly 1.2 million dollars a carat, which remains the reference for what Mogok colour is worth at size.

Do auction prices reflect what I would pay privately?

Not directly. Auction results include a buyer's premium of roughly a fifth to a quarter, they reward provenance and a famous name, and they are set by two bidders on one evening. Private trade for a comparable stone usually sits below the auction total for the same quality, and above it for the stone the auction did not have.

Is a record price a good moment to buy?

A record tells you the top of the market is deep, not that every stone below it is cheap. The sensible response is to buy the best stone your band allows with clean paper, because records pull the top up and the top pulls the certified, unheated middle with it. It does nothing for treated stones or unclear origin.