純金はどれくらい「柔らかい」のか?

How "soft" is pure gold?

by Vien Chi Bao on Feb 24 2026
Table of Contents

    THE MAGIC OF GOLD

    Just How "Soft" Is Pure Gold?

    Exploring the extraordinary properties of the eternal metal

    Did you know that gold is the most malleable and ductile metal in the world? Its unparalleled "suppleness" has been an endless source of inspiration for jewelry making for thousands of years.

    Extraordinary "Malleability"—The Power to Expand Infinitely

    Gold is so highly malleable that a single coin-sized amount can be hammered into gold leaf covering nearly 9 square meters (about 5.5 tatami mats). Finished until it is so thin that light can pass through it, this gold leaf is preserved in Japan as the traditional technique of "Kanazawa foil," elevated to the realm of art.

    The Ultimate "Ductility"—The Power to Stretch Infinitely

    With just one gram of gold, an artisan can draw it out into an ultra-fine wire about 3 kilometers long. It is precisely because of this remarkable ductility that it is possible to create delicate, hair-thin filigree and fluid, intricate patterns that would break with other metals.

    Why Isn't Pure Gold Used for Jewelry?

    Because of its suppleness, 100% pure gold (24K) is extremely soft and easily deformed. To increase its durability as jewelry and to securely hold gemstones, it is common to blend in other metals (alloying), such as silver or copper, to create "18K" or "14K" gold.

    This exquisite blend allows the metal to maintain the beautiful luster of gold while providing the strength needed for daily wear.

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    The reason gold is revered is not just for its rarity.
    It is because it possesses a "gentleness" (malleability and ductility) that flexibly embraces human creativity.

    Delicate and beautiful jewelry is a testament to the miracle
    of this noble metal, pliably transformed for us.