Ruby
Myanmar, Mozambique · 203 specimens · 3.1ct avg
Ruby is the red variety of corundum (Al₂O₃), colored primarily by chromium and sometimes iron. It is one of the most valuable colored gemstones, renowned for its saturated red color and durability. With Mohs hardness 9 and excellent toughness, ruby is ideal for all forms of jewelry, including rings worn daily.
Price History
Quality Tiers
Listings
Specimen Data
Value Drivers
Carat weight is a critical driver of value. Fine-quality rubies above 1–2 carats are scarce, and prices per carat rise sharply with size. Stones over 5 carats in top color and clarity are rare and can command extremely high prices at auction and in high-end retail.
Color is the most important factor in ruby valuation. The finest rubies display a vivid, medium to medium-dark 'pigeon's blood' red with strong saturation and a hint of fluorescence, appearing lively in a range of lighting conditions. Stones that are too dark, too light, heavily brownish or strongly purplish trade at lower price levels.
Rubies commonly contain inclusions. Eye-clean stones are rare, especially in larger sizes. Inclusions are tolerated to a degree, but heavy inclusions that reduce transparency or create significant structural weakness lower value. Some needle-like inclusions can produce desirable phenomena such as asterism (star ruby) when cut en cabochon.
Cut quality is crucial to maximizing color and brilliance. Most rubies are cut into ovals, cushions and mixed cuts that balance face-up appearance and weight retention. Well-cut stones show bright internal reflections and even color, while poorly proportioned gems may look too dark, too shallow or windowed. Orienting the crystal properly also manages pleochroism and color zoning.
Market Dynamics
Major ruby sources include Myanmar (Burma), Mozambique, Madagascar, Vietnam, Tanzania and others. Historically, Burmese rubies have been considered the finest, but Mozambique has become a major supplier of high-quality material in recent decades. Mining is a mix of large-scale operations and artisanal activity, with variable output.
Demand for ruby is consistently strong in both luxury and investment markets. It is one of the classic 'big three' gems, alongside sapphire and emerald, and is highly sought after for high-end jewelry and as a store of value.
Recent Trends: very strong demand and record prices at auction for top-quality rubies, especially from historically prized sources such as Burma and high-end Mozambique material.
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Insights
Heat treatment to improve color and clarity is extremely common in ruby and widely accepted if disclosed; unheated stones with fine color and clarity achieve significant premiums.
Some rubies are subject to more invasive treatments such as fracture filling with glass or flux-healing, which can improve appearance but typically reduce long-term value and require full disclosure.
Origin reports from respected gemological laboratories (e.g., identifying Burmese or Mozambique origin) can materially influence ruby prices.
Rubies with strong fluorescence can appear particularly vivid in daylight due to chromium-related emission.
Star rubies, showing asterism under direct light, are valued according to star sharpness, color, transparency and carat weight, with fine examples commanding notable prices.
Synthetic rubies have been produced since the early 1900s; identifying treatments and natural vs. synthetic origin is a critical part of modern ruby trade.