Introduction

When choosing jewelry, many people first look at the color, shine, or design of the piece. But there is an extremely important technical characteristic—especially for jewelry worn every day: The hardness of precious stones.

Hardness directly influences:

• scratch resistance
• durability
• preservation over time
• ideal type of jewelry use

Understanding this characteristic helps in making more conscious choices that are better suited to each person's lifestyle.

In this ArtOuro guide, you will understand:

• What is the hardness of gemstones?
• How does the Mohs scale work?
• What are the most durable gemstones?
• and the hardness of each natural stone used in ArtOuro jewelry.

What is the hardness of a gemstone?

Hardness measures a mineral's resistance to scratching. In other words, the higher the hardness, the greater the gem's ability to resist scratches and surface wear.

The main reference used worldwide is: Mohs scale, created in 1812 by the mineralogist Friedrich Mohs.

It varies from:

• 1 → extremely soft minerals
• 10 → the diamond, the hardest known natural mineral

Important:

The Mohs scale is not linear.

This means that a diamond (10) is not just “a little” harder than a topaz (8) — it is significantly more resistant.

Why does the hardness of gemstones matter in jewelry?

Hardness directly influences:

✔ Durability
✔ Preserves shine
✔ Resistant to daily use
✔ Jewelry longevity

Gemstones with greater hardness tend to be more suitable for: rings worn constantly, wedding bands, and jewelry worn daily. More delicate gemstones may require more care.

The hardness of the natural gemstones used by ArtOuro

Diamond — hardness 10

Diamond is the hardest known natural mineral.
Therefore, it possesses exceptional durability, maintains its shine for decades, and is extremely scratch-resistant.

It is traditionally used in: rings, wedding bands, and jewelry worn continuously.

Imperial Topaz — hardness 8

One of Brazil's most valuable gems. It has:

• excellent resistance
• brightness
• excellent durability for jewelry.

Blue Topaz — hardness 8

Highly valued for its transparency and crystalline brilliance.
It is a durable gemstone suitable for:

• rings
• earrings
• pendants

White Topaz — hardness 8

Known for its elegant shine and sophisticated appearance.
It offers excellent resistance to daily use.

Aquamarine — hardness 7,5 to 8

A variety of beryl, from the same family as emerald.

It is one of the most used gemstones in fine jewelry, as it combines delicate beauty, good resistance, and excellent versatility.

Morganite — hardness 7,5 to 8

It also belongs to the beryl family.
Its hardness allows for optimal performance in: rings, earrings, and necklaces.

Emerald — hardness 7,5 to 8

Despite its good hardness, emeralds often have natural internal inclusions and therefore require greater care to protect against impacts and are considered a more structurally delicate gemstone.

Tourmaline — hardness 7 to 7,5

One of Brazil's most important gems.

It includes varieties such as:

• Green Tourmaline
• Rubelite
• Indicolite
• Pink Tourmaline
• Paraiba Tourmaline

It has good durability and comes in a wide variety of colors.

Rubellite — hardness 7 to 7,5

A pinkish-red variety of tourmaline.
Highly valued in fine jewelry.

Indicolite Tourmaline — hardness 7 to 7,5

Known for its intense and rare blue coloration.

Paraíba Tourmaline — hardness 7 to 7,5

One of the rarest and most sought-after gems in the world.
Recognized by its characteristic neon coloring.

Amethyst — hardness 7

A violet variety of quartz, it boasts good durability, excellent brilliance, and is an excellent value for money in fine jewelry.

Citrine — hardness 7

Another variety of natural quartz, it is widely used in jewelry due to its suitable resistance, luminosity, and warm tone.

Amazonite — hardness 6 to 6,5

An ornamental gemstone known for its blue-green color. Requires a bit more care to prevent scratches.

Rhodolite — hardness 7 to 7,5

A variety from the garnet family, it exhibits excellent luster, good resistance, and intense color.

Garnet — hardness 6,5 to 7,5

A mineral group known for its deep colors and striking luster.

Peridot — hardness 6,5 to 7

A vibrant green gemstone historically associated with light and protection.

Kunzite — hardness 6,5 to 7

It has a delicate color and a sophisticated appearance. It may be more sensitive to impacts.

Opal — hardness 5,5 to 6,5

One of the most delicate gems in jewelry. Known for the optical phenomenon called "play of colors." Requires special care.

Natural gems vs. man-made stones

Today the market coexists with materials produced in laboratories, including:

• synthetic stones
• artificial materials
• so-called lab-grown

Although they may look similar, natural gemstones remain significantly more desirable in the world of fine jewelry.

This happens because they carry:

• rarity
• natural geological formation
• singularity
• perceived value over time

Each natural gemstone possesses unique characteristics that cannot be fully reproduced on an industrial scale.

How to care for jewelry with precious stones.

Some precautions help preserve the beauty of gemstones:

✔ Avoid strong impacts
✔ Avoid contact with chemicals
✔ Store separately
✔ Clean with a soft cloth and mild soap.

More delicate gemstones, such as opals and emeralds, require extra care.

The balance between beauty and durability.

In fine jewelry, choosing the ideal gemstone involves a balance between:

• hairsalon
• meaning
• rarity
• resistance

Therefore, knowing the hardness of gemstones helps not only in preserving the jewelry — but also in choosing the most suitable piece for each occasion and lifestyle.

ArtOuro's proposal

At ArtOuro, each piece of jewelry is created with:

• 18k gold
• selected natural gems
• craft production

The selection of stones considers not only beauty and rarity, but also gemological quality and durability.

✨ Discover jewelry with natural Brazilian gemstones

FAQ

What is the hardest gemstone?
The diamond, with a hardness of 10 on the Mohs scale.

Which gemstone is best for everyday use?
Diamonds, topazes, aquamarines, and tourmalines often perform excellently in everyday wear.

Are emeralds delicate?
Yes. Despite their good hardness, they usually have natural internal inclusions that require more care.

Do synthetic stones have the same value?
Not usually. Natural gemstones continue to be more valued due to their rarity, geological origin, and uniqueness.