Jadeite

─── Why This Stone Matters ───

The Stone That Names the Brand

Jadeite (in Japanese: 翡翠 · Hisui) is the stone that gives this entire atelier its name. Stone Artistry HISUI is, literally, the artistry of jadeite.

Among the thirty-six power stones in the HISUI master collection, this one is the elder. The other stones arrive from many cultures — European mineral folklore, Vedic tradition, Chinese geomancy. Hisui comes from this land: from Itoigawa, from the Jōmon period, from five thousand years before written history.

No other stone on the planet carries an unbroken cultural lineage as long as Japanese jadeite. The same Hime River that the Jōmon walked to gather their first beads still pushes jade boulders onto the beaches today. The substance that crowned the first emperors crowns the current one. The line is unbroken.

─── Mineralogy ───

Jadeite vs Nephrite — The Science Behind the Word "Jade"

The English word "jade" is commercial shorthand for two mineralogically distinct stones: jadeite and nephrite. Until the French mineralogist Alexis Damour formally separated them in 1863, even European jewellers conflated the two. The science has since matured, and the distinction is fundamental.

Jadeite is the rarer and more valued of the two. Its granular crystal structure gives it a glassier lustre that allows light to enter the stone more deeply, producing the inner glow that connoisseurs call shen — spirit. Nephrite, by contrast, has a fibrous structure that diffuses light into a softer, oilier sheen. Both have their devotees. Only jadeite is the National Stone of Japan.

─── Colour ───

The Colour Spectrum of Itoigawa Jadeite

Most jadeite sources produce a single dominant colour. Myanmar yields the imperial green that dominates the contemporary jewellery trade. Guatemalan deposits produce blue-green and lavender. Russia produces pale white-green. Itoigawa, alone among the world's jadeite sources, produces the entire spectrum from a single river system.

The colour is determined by trace impurities crystallised into the jadeite matrix during its geological formation. Chromium produces the imperial green. Iron produces yellow-green and brown tones. Manganese produces the rare lavender. Graphite produces black. The geological conditions at Itoigawa — a high-pressure, low-temperature metamorphic environment along the ancient Pacific subduction zone — were uniquely suited to producing this breadth of variation.

─── Meaning ───

The Stone's Energy

Hisui carries the energy of sacred protection, eternity, symbolism, and the divine feminine. In Shinto tradition, jadeite is the stone the gods reached for first — the substance of offerings, the regalia of rulers, the bead worn against the heart.

"神を宿す石 — the stone that houses gods."
Hisui scores ★★★ on six of eight axes — the only stone in the HISUI master collection to do so. The strongest energy signature is, fittingly, the one that gives the brand its name.

─── History ───

5,000 Years of Sacred Use

Japanese jade work begins in the Jōmon period (roughly 5,000–300 BCE) at Itoigawa, on the Sea of Japan coast in present-day Niigata Prefecture. Hunter-gatherers there were already drilling holes through jade boulders and stringing them into beads — at a date that places them among the world's earliest jade artisans, predating Chinese jade-working at its peak by over three thousand years.

By the Kofun period (~300–538 CE), the comma-shaped magatama bead had emerged as the signature form. Hundreds of jade magatama have been recovered from imperial tumuli, often paired with bronze mirrors and iron swords — the trinity that would become the regalia.

The mythological codification arrived in the Nara period: the Kojiki (712 CE) named the imperial bead as Yasakani no Magatama, gifted from the sun goddess Amaterasu to her grandson Ninigi, the divine ancestor of the imperial line. To this day, no emperor has ever ascended without it.

For nearly a thousand years after the Heian shift toward Buddhist iconography, the Itoigawa workshops fell silent and the location of Japan's jade source was forgotten. Then, in 1938, geologist Kawano Yoshitarō identified jadeite boulders in the Kotaki Stream — confirming that Japan had its own native source all along. Archaeological excavation followed, the Chōjagahara workshops were rediscovered, and the narrative of Japanese prehistory was rewritten.

On 24 September 2016, the Japan Association of Mineralogical Sciences formally designated jadeite — specifically the variety found at Itoigawa — as the National Stone of Japan. The five-thousand-year lineage met the modern era on that day.

─── Specifications ───

The Stone's Profile

─── Affinities ───

Tarot, Zodiac and Deity

Hisui's energy resonates with cards of fertility, balance, and the great work — and with both the Egyptian and Shinto deities of the sacred feminine.

─── Care ───

Caring for Hisui Jewellery

Jadeite is remarkably tough but still benefits from thoughtful care. The atelier recommends the following practices for bracelets and pendants:

• Clean with soft cloth — Wipe with a dry, lint-free cloth after wearing. Avoid ultrasonic cleaners, which can stress the matrix over time.
• Store separately — Although jadeite is harder than most everyday objects, store it apart from other jewellery to prevent surface marks from harder stones such as topaz or sapphire.
• Avoid harsh chemicals — Remove jadeite before swimming, applying perfume, or using cleaning products. Chlorine and ammonia can dull the surface.
• Lunar cleansing — In the Japanese witch tradition, hisui is rested under moonlight on the night of the full moon. This is folkloric rather than physical, but the practice deepens the bond between wearer and stone.
• Heat sensitivity — Extreme thermal shock can stress any natural stone. Remove hisui before saunas, hot baths, or prolonged sun exposure.