Rare Collectibles · August 2024
Ask anyone in the Akoya trade for a Tennyo strand above 10 mm and most will tell you it doesn’t exist. This month one came to us: a full strand of Tennyo Akoya pearls measuring 10.5 to 11.3 mm, certified Aurora Tennyo® by Pearl Science Laboratory (PSL). As far as we and our partners in Japan can tell, there are fewer than ten strands like it in the world.
Aurora Tennyo® Akoya
From the PSL report
- Pearl
- Japanese saltwater Akoya, cultured
- Size
- Approx. 10.5–11.3 mmTypical Akoya: 6–8 mm
- Designation
- Aurora Tennyo® (オーロラ天女)
- Interference
- Pink-green
- Body color
- White
- Surface
- Very slight (微)
- Shape
- Round series
- Nacre
- 1.0 mmHanadama requires 0.4 mm
- Report
- PSL SP-type, numberedNumber withheld for the owner’s privacy
Two kinds of rare in one strand
Most rare pearls are rare for one reason. This strand is rare for two, and they work against each other.
The first is size. Akoya are the small, bright pearls of Japan. Most measure 6 to 8 mm, and the trade treats anything above 10 mm as rare. Growing a pearl that large means implanting a much bigger bead in a small oyster, then keeping that oyster alive and feeding in the water for years. Many don’t survive. Of those that do, most pearls come out with spots, uneven shapes or dull patches, because every extra season is another chance for something to go wrong.
The second is grade. Aurora Tennyo® is PSL’s top designation for white Akoya. A strand must first pass all five criteria for Aurora Hanadama®: size, nacre, shape, surface and luster. PSL then selects again, on luster and color alone. A Tennyo strand must reach at least 90% of the highest brightness PSL has recorded and show three or more interference colors, red through green. Few Hanadama strands pass. (Our Tennyo guide walks through every step.)
- 10.5–11.3 mmNearly twice the volume of a 9 mm Akoya, at the far edge of what the oyster can grow.
- 1.0 mmNacre thickness on the PSL report: two and a half times PSL’s Hanadama minimum.
- Fewer than 10Strands of this size at Tennyo grade, by our estimate and that of our partners in Japan.
Put the two together and the funnel closes almost completely. A large Akoya is uncommon. A large Akoya with Tennyo luster is a few pearls in an entire harvest. A full strand of them, matched in size, color and overtone from end to end, is the work of many harvests, collected pearl by pearl until there are enough to string.
Tennyo (天女) means “celestial maiden.” At this size, the name finally feels earned.
See it move
Teri, the Japanese word for a pearl’s glow, doesn’t photograph well. It lives in motion: pink and green sliding across each pearl as the strand turns, and a sharp, mirror-like reflection that seems to sit just under the surface. We filmed the strand in our office under ordinary light, with no filters.
VideoUnedited clips of the strand, August 2024. Tap any clip to play.
Reading this strand’s report
Every Tennyo strand carries PSL’s SP-type report, a format used only for this grade. Here is what this one says, in plain terms.
| On the report | Reads | What it means |
|---|---|---|
| 特別呼称 (special name) | オーロラ天女 | Aurora Tennyo®, PSL’s top designation for white Akoya |
| サイズ (size) | 約10.5–11.3 mm | Roughly 10.5 to 11.3 mm across the strand |
| 干渉色 (interference) | ピンクグリーン系 | Pink-green: a rose overtone with flashes of green |
| ボディカラー (body color) | ホワイト系 | White |
| きず (surface) | 微 | Very slight, PSL’s cleanest surface rating |
| かたち (shape) | ラウンド系 | Round series |
| まき厚 (nacre) | 1.0 mm | Exceptionally thick for Akoya |
| 備考 (remarks) | オーロラ花珠の範疇 | Falls within Aurora Hanadama®, as every Tennyo must |
The report also carries a photograph of the strand’s own Aurora Effect pattern, sealed with a hologram mark. No two pearls share that pattern, so it works like a fingerprint that ties this strand to this report.
Why we call it a collectible
Most of what we sell, we can sell again. A matched Hanadama strand in 8 mm can be reordered; it takes time, but the pearls exist. This strand can’t be reordered. Nobody can promise another one next season, or in the next five. Once it is placed, the next buyer who asks for a 10.5 mm Tennyo will most likely hear what we would have said a year ago: it doesn’t exist.
That is why we are opening a new section on this site, Rare Collectibles, for pieces like this one: one of a kind, documented, and worth writing down while they pass through our hands.
Frequently asked questions
Most Akoya pearls measure 6 to 8 mm, and anything above 10 mm is considered rare. Strands of 10.5 to 11.3 mm sit at the practical upper limit of what the small Akoya oyster can produce.
Almost never. Tennyo is already a small selection within PSL's Aurora Hanadama® grade, and very few large Akoya reach Tennyo luster. By our estimate and that of our partners in Japan, fewer than ten strands of 10.5 to 11.3 mm Tennyo exist.
Every Aurora Tennyo® strand comes with a numbered PSL SP-type report that includes a photo of the strand's own Aurora Effect pattern, sealed with a hologram mark. Ask the seller to show the full report.
A PSL report number identifies one specific strand. We blur it in public photos to protect the strand's future owner and the retailer who places it. Approved trade buyers can see the full report on request.
Also in Rare Collectibles: Hanadama at 11–12 mm · Tanzanite Blue & Amethyst Edison pearls.
Learn more: Hanadama & Tennyo pearls: PSL grading explained · What are Akoya Tennyo?