Buying Gemstones: Ruby, Sapphire, Emerald & More at a Glance

April 21, 20264 min read

Edelsteine kaufen: Rubin, Saphir, Smaragd & mehr im Überblick

Buying Gemstones: Ruby, Sapphire, Emerald & More at a Glance

The world of gemstones is fascinating, colorful, and complex. Besides the ubiquitous diamond, there are hundreds of gemstones – each with unique color, history, and symbolism. Whether it's the brilliant red ruby, royal blue sapphire, or lush green emerald: colored gemstones have captivated people for millennia.

This guide provides you with the knowledge you need to understand, evaluate, and safely purchase colored gemstones.

Why Colored Gemstones are Booming Right Now

In recent years, a clear trend has emerged: more and more jewelry buyers and investors are discovering colored gemstones as an alternative to diamonds. The reasons:

Rare stones such as unheated rubies or Kashmiri sapphires fetch record prices at auctions
Personal expression through color instead of conforming white
Birthstone meaning for personal connection
Growing awareness of ethical alternatives

The "Big Three": Ruby, Sapphire, Emerald

Ruby – Fire and Passion

Rubies belong to the corundum mineral and get their deep red color from chromium impurities. After diamonds, they are the most expensive gemstone in the world – high-quality unheated rubies can even exceed the price of a comparable diamond per carat.

Quality Characteristics:

Color: Intense, medium-dark red (so-called "Pigeon Blood Red") is the most valuable
Origin: Burma/Myanmar traditionally produces the best stones (GRS certificate particularly important)
Treatment: Most rubies are heat-treated. Unheated stones are significantly more valuable.

Price Orientation: 500 – 50,000 €/ct (depending on origin, treatment, color)

Sapphire – Sky and Depth

Sapphires are the same mineral as rubies (corundum) – just without chromium, but with iron and titanium, which create the blue color. However, sapphires come in almost all colors: pink, yellow, orange, green, violet, and the coveted Padparadscha (salmon-pink-orange).

Quality Characteristics:

Color: Rich Royal Blue or Cornflower Blue are the most valuable
Origin: Kashmir (India) is considered the royal class – extremely rare, prices have exploded. Sri Lanka (Ceylon) and Burma are also high quality.
Treatment: Many sapphires are heat-treated. Unheated Kashmiri sapphires are among the most expensive gemstones ever.

Price Orientation: 300 – 100,000 €/ct (unheated Kashmiri: far above)

Emerald – Lush and Mysterious

Emeralds belong to the beryl family and get their intense green color from chromium and vanadium. Almost all emeralds have natural inclusions (called "jardin" – French for garden), which are considered characteristic and not flaws.

Quality Characteristics:

Color: Rich, vibrant green with a slight blue tint is ideal
Origin: Colombia (Muzo, Chivor) is considered the best origin worldwide
Treatment: Almost all emeralds are treated with cedar oil or resin (clarity enhancement). Completely untreated emeralds are extremely rare and very valuable.

Price Orientation: 200 – 20,000 €/ct (Colombian top quality)

Other Gemstones at a Glance

Tanzanite

Mined only in a small area in Tanzania. Deep violet-blue, trichroic (shows three different colors depending on the viewing angle). Rare and stable in value.

Alexandrite

One of the most fascinating stones: green in daylight, red in artificial light. This color change is extremely rare and makes alexandrite one of the most valuable colored gemstones.

Opal

Iridescent play of color (opalescence) of all rainbow colors. Australian black opals are the rarest and most valuable. Very delicate – not suitable for everyday jewelry.

Tourmaline

One of the most versatile gemstones – available in almost every color. Particularly valuable: Paraíba tourmaline (neon blue/green, from Brazil and Mozambique).

Spinel

Long mistaken for ruby. Brilliant red, pink, and blue tones. Rarely unheated and therefore increasingly interesting as an investment.

Quality Characteristics for Colored Gemstones: The 4 Cs Equivalent

For colored gemstones, similar criteria apply as for diamonds, but with different weighting:

Color (most important criterion!): Saturation, tone, purity of color
Clarity: Unlike diamonds, inclusions in emeralds are normal and accepted
Cut: Influences color intensity and brilliance
Carat: Weight – but density varies by stone type

Certificates: Essential when buying valuable colored gemstones

GIA (Gemological Institute of America): Globally recognized
GRS (Gem Research Swisslab): Especially for rubies and sapphires, very precise origin indication
Gübelin Gem Lab: Swiss quality, especially for rare stones
SSEF (Swiss Gemmological Institute): Excellent for origin determination

FAQ: Buying Gemstones

Which gemstone is the most valuable? Per carat, high-quality, unheated rubies from Burma and Kashmiri sapphires are the most expensive colored gemstones – more expensive than diamonds. However, fancy-color diamonds (pink, blue) surpass all other stones.

How do I tell if a gemstone has been treated? Only a gemologist with a proper laboratory can definitively determine this. Always buy with a certificate – it will state the treatment status.

Are synthetic colored gemstones worthless? As a jewelry stone, synthetic stones are acceptable. As an investment, they have no significant resale value. Pay attention to clear labeling when purchasing.