Gemstones from A to Z

Beauty, Rarity, and Value

Natural gemstones have fascinated people for millennia with their colors, formation history, and rarity. Each stone is a unique creation of nature - formed over millions of years through geological processes, pressure, heat, minerals, and extraordinary conditions deep within the Earth.

In addition to their beauty, select gemstones can also be of interest to collectors and as long-term assets. However, it’s important to note that not every gemstone automatically holds significant value. The decisive factor is always the quality of the individual stone: its color, transparency, clarity, cut quality, size, origin, treatment, rarity, and documentation.

Natural colored gemstones with intense color, good transparency, a fine cut, and ideally no treatment or only treatment that is transparently documented are particularly prized. These include, above all, ruby, sapphire, emerald, alexandrite, spinel, Paraíba tourmaline, tsavorite, demantoid, as well as special varieties such as padparadscha sapphire, rubellite, indigolite, mandarin garnet, or fine color variations of sapphire.

For better orientation, we distinguish between three categories:

Particularly relevant for value-oriented collectors
These gemstones can be especially valuable when they feature exceptional quality, rare color, natural origin, good size, and reputable certification.

Of interest to collectors and enthusiasts
These gemstones have collector’s value, but this value depends more heavily on individual quality, color, size, rarity, and demand.

Gemstones for Jewelry, Design, and Enthusiasts
These gemstones are valued primarily for their beauty, color, personal significance, and value as jewelry. However, individual exceptional specimens may still be of interest to collectors.

Alexandrite

Alexandrite is a rare variety of chrysoberyl and is famous for its color change. Depending on the light, it can appear greenish, bluish, reddish, or purplish. Natural alexandrites with a strong color change and good transparency are particularly prized.
Classification: Particularly relevant for value-oriented collectors.
Important: Strong color change, natural origin, good transparency, certificate.

Amethyst

Amethyst is the violet variety of quartz. Its colors range from delicate lavender to intense purple. Particularly beautiful amethysts display an even, vibrant violet without distracting color zones.
Classification: Gemstone for jewelry, design, and collectors.
Important: Intense color, even color distribution, good transparency, and a natural overall appearance.

Aquamarine

Aquamarine belongs to the beryl family and is known for its light blue to sea-blue hues. High-quality aquamarines are transparent, clear, and display a fresh, vibrant color. Intense blue tones without gray undertones are particularly prized.
Classification: Of interest to collectors and enthusiasts.
Important: Size, clarity, intense blue color, good cut, and natural color effect.

Citrine

Citrine is the yellow to golden-orange variety of quartz. Natural citrine is significantly rarer than many people believe, as a large portion of the commercial supply is produced by heating amethyst. Warm, clear shades ranging from gold to orange are particularly attractive.
Classification: Gemstone for jewelry, design, and collectors.
Important: Natural color, transparency, warm hues, and good brilliance.

Chrysoberyl

Chrysoberyl is a hard, brilliant gemstone that usually appears yellowish, greenish, or golden in color. In addition to alexandrite, cat’s eye chrysoberyl is also among the most highly prized varieties of this gemstone family.
Classification: Of interest to collectors and enthusiasts.
Important: Good brilliance, fine color, and, in the case of cat’s eye, a sharp, clearly visible band of light.

Demantoid

Demantoid is a rare green garnet variety with exceptionally strong fire. Intense shades of green, high brilliance, and fine transparency are particularly sought after. Characteristic inclusions in demantoid may even be valued if they are typical and aesthetically pleasing.
Classification: Particularly relevant for value-oriented collectors.
Important: Intense green color, strong fire, high brilliance, rarity, origin.

Emerald

Emerald is the green variety of beryl and ranks among the most significant colored gemstones. Its color ranges from delicate green to deep, intense green. Inclusions are common in emeralds and are often accepted as part of their natural character. A beautiful color, good transparency, and clear disclosure of any treatment are crucial. With emeralds, special attention should be paid to whether there is no, slight, moderate, or heavy oiling or filling.
Classification: Particularly relevant for value-oriented collectors.
Important: Delicate green, good transparency, origin, low oil content or disclosure of treatment, and a reliable certificate.

Garnet

Garnet is not a single type of gemstone, but a diverse group of gemstones. It includes classic red garnets as well as rare green, orange, violet, or golden-green varieties. Tsavorite, demantoid, mandarin garnet, Mali garnet, spessartine, and rhodolite are particularly prized.
Classification: Varies greatly depending on the variety.
Important: Variety, color, transparency, brilliance, size, cut, and rarity.

Heliodor or Golden Beryl

Heliodor is the yellow to golden-yellow variety of beryl and thus belongs to the same gemstone family as aquamarine, morganite, and emerald. Its color ranges from pale yellow to warm golden yellow. Particularly beautiful heliodors display a clear, vibrant color and good transparency.
Classification: Of interest to collectors and enthusiasts.
Important: Golden-yellow color, transparency, size, good cut, and natural color effect.

Iolite

Iolite typically displays violet-blue to bluish-gray colors and is known for its strong pleochroism. The color can change significantly depending on the viewing angle. It is an elegant, often underrated gemstone with a calm, cool aura.
Classification: Gemstone for jewelry, design, and collectors.
Important: Clear, intense shades of blue, good transparency, and a harmonious cut.

Jade and Jadeite

Jade primarily comprises jadeite and nephrite. High-quality jadeite is particularly valuable, especially fine, uniform, and as transparent as possible green varieties. Commercially available jade or nephrite, on the other hand, are usually more suited for jewelry and collector’s stones.
Classification: High-quality jadeite is particularly relevant for value-oriented collectors.
Important: Fine color, good transparency, natural quality, and clear disclosure of any treatments.

Kunzite

Kunzite is a pink to violet-pink variety of spodumene. It appears elegant, delicate, and luminous, but can be sensitive to strong sunlight. Particularly beautiful stones display a clear, fresh color and good transparency.
Classification: Gemstone for jewelry, design, and collectors.
Important: Color, size, transparency, cut, and careful handling of light.

Lapis Lazuli

Lapis lazuli is a deep-blue gemstone that has been prized since ancient times. Particularly sought after are intense, uniform shades of blue with minimal calcite and fine pyrite veining.
Classification: Gemstone, design stone, and collector’s stone.
Important: Deep blue color, low calcite content, harmonious pyrite veining, and natural quality.

Malachite

Malachite is known for its intense green color and characteristic banding. It is particularly valued in jewelry design and decorative objects. Its natural patterning gives each piece a unique appearance.
Classification: Jewelry, design, and collector’s stone.
Important: Intense color, beautiful banding, good polish, and an aesthetic pattern.

Moonstone

Moonstone captivates with its soft sheen, known as adularescence. Stones with a clear glow, good transparency, and harmonious play of color are particularly sought after. It is often associated with symbolism, intuition, and gentle elegance.
Classification: Gemstone, design stone, and collector’s stone.
Important: Strong shimmer, beautiful play of light, transparency, and good stability.

Morganite

Like aquamarine, heliodor, and emerald, morganite belongs to the beryl family. Its color palette ranges from delicate pink to peach tones. Clear stones with a warm, elegant color are particularly sought after.
Classification: Gemstone, design stone, and collector’s stone.
Important: Good transparency, pleasant color, larger clear specimens, and fine cut.

Opal

Opal is one of the most unique gemstones of all. No two opals are alike. Precious opals with intense play of color, attractive black opals, boulder opals, and fire opals with vibrant color are particularly sought after. Their value depends heavily on play of color, pattern, brightness, stability, and origin.
Classification: Of interest to collectors and enthusiasts.
Important: Intense play of color, attractive pattern, stability, natural origin, and good condition.

Padparadscha Sapphire

Padparadscha sapphires are among the rarest and most sought-after varieties of sapphire. Their distinctive color ranges from pink to orange to salmon. Natural, untreated stones with a harmonious, clear color are particularly valuable.
Classification: Particularly relevant for value-oriented collectors.
Important: Harmonious padparadscha color, untreated quality, transparency, and laboratory certificate.

Paraíba Tourmaline

Paraíba tourmaline is famous for its vibrant neon colors in blue, turquoise, or blue-green. This unique color effect is caused by trace elements such as copper. High-quality Paraíba tourmalines are very rare and highly sought after in the high-end collector’s market.
Classification: Particularly relevant for value-oriented collectors.
Important: Intense neon color, evidence of copper, transparency, origin, and certificate.

Peridot

Peridot displays fresh green to yellow-green hues. Particularly beautiful specimens have a clear, vibrant color. Larger, pure stones are significantly rarer than small, commercial-grade stones.
Classification: Gemstone for jewelry, design, and collectors.
Important: Fresh green color, good transparency, larger stones.

Rhodolite

Rhodolite is a popular violet-red to purplish-red variety of garnet. Its color often appears softer and more elegant than that of classic red garnets. Particularly beautiful rhodolites display vibrant raspberry, purple, or violet-red tones with good transparency and brilliance.
Classification: Of interest to collectors and enthusiasts.
Important: Vibrant purple to raspberry tones, good transparency, brilliance, size, and a harmonious cut.

Ruby

Ruby is the red variety of corundum and is considered one of the classic, valuable colored gemstones. Intense, pure red tones, good transparency, and untreated quality are particularly sought after. Origin and certification can significantly influence the value.
Classification: Particularly relevant for value-oriented collectors.
Important: Untreated quality, intense red color, good transparency, recognized certificate.

Rubellite

Rubellite is the red to pinkish-red variety of tourmaline. Its vibrant colors appear lively, modern, and evocative. High-quality rubellites can be an attractive alternative to rubies, especially when their color, clarity, and cut are impressive.
Classification: Interesting to particularly relevant, depending on quality.
Important: Intense shades of pink, red, and raspberry; good transparency; stable color; and a fine cut.

Sapphire

Like the ruby, the sapphire belongs to the corundum family. In addition to the classic blue, sapphires come in many colors, including yellow, pink, violet, green, teal, and padparadscha. Intense, vibrant shades of blue with good transparency are particularly sought after.
Classification: Particularly relevant for value-oriented collectors.
Important: Untreated quality, fine color, good transparency, origin, and certificate.

Spinel

Spinel was long underappreciated but has been gaining significant attention for years. Rich reds, pinks, violets, and rare cobalt-blue hues are particularly sought after. Natural spinel is often untreated and is therefore especially prized by collectors.
Classification: Particularly relevant for value-oriented collectors.
Important: Fine color, good size, transparency, rare hues, and natural quality.

Tanzanite

Tanzanite is the best-known variety of the mineral zoisite and comes mainly from Tanzania. Its blue-violet color makes it unmistakable. High-quality tanzanites display an intense blue with violet undertones and good transparency.
Classification: Of interest to collectors and enthusiasts.
Important: Deep blue-violet, good transparency, larger stones, and fine cut.

Teal Sapphire and Parti Sapphire

Teal sapphires display fascinating shades ranging from blue-green to petrol blue. Parti sapphires feature natural color zoning and can combine multiple colors within a single stone. Both varieties have a modern, unique look and are less classic in style than traditional blue sapphires.
Classification: Of interest to collectors and enthusiasts.
Important: Harmonious color distribution, natural color, good transparency, and an attractive cut.

Titanite / Sphene

Titanite, also known as sphene, is an extraordinary gemstone with intense fire and a vibrant play of light. Its colors range from yellow-green to gold-green to brown-green. Particularly beautiful specimens exhibit high brilliance, strong dispersion, and a warm, expressive color. Due to its lower hardness and fragility, titanite is more of a stone for collectors, connoisseurs, and enthusiasts than a classic gemstone for heavy-duty everyday jewelry. However, when set in protective mountings or as a collector’s stone, it can make a striking impression.
Classification: Of interest to collectors, connoisseurs, and enthusiasts.
Important: Strong fire, vivid color, good transparency, fine cut.

Topaz

Topaz occurs in many colors, including blue, yellow, orange, pink, and colorless. Natural imperial topaz in shades ranging from golden orange to reddish-orange is particularly valuable. Many blue topazes on the market are treated.
Classification: Depending on the variety, of interest to collectors and enthusiasts.
Important: Natural Imperial topaz is significantly more valuable to collectors than the commonly treated standard varieties.

Tourmaline

Tourmaline is one of the most colorful groups of gemstones in existence. Rubellite, indigolite, chrome tourmaline, watermelon tourmaline, and Paraíba tourmaline are particularly prized. This diversity makes tourmaline fascinating for both jewelry enthusiasts and collectors.
Classification: Depending on the variety, ranging from interesting to particularly relevant.
Important: Rare colors, good transparency, intense color saturation, natural quality, and a fine cut.

Tsavorite

Tsavorite is a rare green garnet variety with intense color and high brilliance. It is often viewed as an attractive alternative to emerald, but large, high-quality specimens are rare.
Classification: Particularly relevant for value-oriented collectors.
Important: Intense green color, good clarity, brilliance, larger stones, and natural quality.

Zircon

Natural zircon is a brilliant gemstone with strong fire. It occurs in various colors, including blue, honey, brown, green, and colorless. It should not be confused with synthetic zirconia.
Classification: A gemstone for jewelry, design, and collectors; in fine quality, it is also of interest to connoisseurs.
Important: Natural quality, good brilliance, rare hues, and a clear distinction from zirconia.

Overview: Which gemstones are particularly interesting?

Particularly relevant for value-oriented collectors

These gemstones can be especially valuable when they exhibit exceptional quality, natural origin, rare color, and reliable documentation. However, the individual specimen is always the deciding factor.

• Alexandrite
• Demantoid
• Emerald
• High-quality jadeite
• Padparadscha sapphire
• Paraíba tourmaline
• Ruby
• Sapphire
• Spinel
• Tsavorite

Of interest to collectors and enthusiasts

These gemstones have collector’s potential, especially when their color, size, transparency, cut, and rarity are significantly above average.

• Aquamarine
• Chrysoberyl
• Garnet, depending on the variety
• Heliodor
• Opal
• Rodolite
• Rubellite
• Tanzanite
• Teal sapphire and parti sapphire
• Titanite / Sphene
• Topaz, especially imperial topaz
• Tourmaline

Primarily jewelry, design, and collector’s stones

These gemstones stand out above all for their color, style, symbolism, and personal charm. They are particularly well-suited for unique jewelry pieces, gifts, and modern gemstone designs.

• Amethyst
• Citrine
• Iolite
• Kunzite
• Lapis Lazuli
• Malachite
• Moonstone
• Morganite
• Peridot
• Zircon

Our Note on Gemstones as Tangible Assets

Gemstones are natural products, not standardized financial products. Their value depends on many factors: color, clarity, transparency, cut, carat weight, origin, treatment, rarity, demand, and documentation.

Anyone who views gemstones as a tangible asset should therefore focus not only on the stone’s name but also on the individual quality of each specific specimen. A small, untreated stone with an exceptional color can be more valuable than a larger stone of average quality.
The following factors are particularly important:

• natural origin
• no treatment (or minimal treatment that is transparently documented)
• intense, attractive color
• good transparency
• professional cut
• reputable documentation
• long-term value

Natural gemstones are not short-lived trend items. A truly valuable gemstone combines beauty, rarity, individuality, and naturalness. It is precisely this combination that makes natural gemstones not only special pieces of jewelry, but also unique testaments to nature.