The Blue Moon of Josephine
- Year
- sold 2015
- Rank
- 6 of 100
- Identifier
- 12.03 ct cushion-cut Fancy Vivid Blue, Internally Flawless; ex-Cullinan Mine 2014
The Blue Moon of Josephine
Realized at auction: $48,400,000, dated 2015-11-11. This is a realized sale. Somebody paid it.
What is it, and why is it in the FLOAT 100?
Highest price-per-carat for any diamond at the time (>$4M/ct); bought by Joseph Lau for his daughter.
12.03 ct cushion-cut Fancy Vivid Blue, Internally Flawless; ex-Cullinan Mine 2014
What is the best-sourced number for it?
- Figure
- $48,400,000
- Kind
- Realized at auction
- Date
- 2015-11-11
A realized auction price is what a buyer actually paid on the date shown, including the buyer's premium where the sale reported it. It is the strongest kind of reference price, and it is a record of one sale of one object on one day, not a promise of what the next example will bring.
By reference price, The Blue Moon of Josephine is number 6 of 99 in the jewelry entries of the FLOAT 100. 42 of those 99 rest on a realized sale; the rest carry an asking price or a guide value, and each page says which. Rank within the FLOAT 100 itself (6 here) is editorial: how much an object defines its field, not price alone.
How this is made
- The figure
- One reference price, shown with its own kind. FLOAT does not average it with anything or adjust it for time.
- Realized or not
- A realized price is a completed sale. A market asking price and a price-guide value are not sales, and are labeled as such wherever they appear.
- Why no grade ladder
- Most FLOAT 100 entries are individual objects. There is one of this, so there is no population and no spread across grades to show.
- Archive
- 2026-08-08
Track your own
FLOAT is a free tracker. Add the jewelry you own, keep photos and certificates with each item, and see a value built from real sales at your item's grade. This page is a public reference; it does not offer, price or sell insurance.