haus1919 sells round brilliant lab-grown diamonds that have been checked by ray tracing before they are listed. It is run by Grey & Co Pte Ltd in Singapore and ships to the United States and Singapore.
What we do
- Each stone comes with an IGI report. We take the table, depth, crown angle and pavilion angle printed on it and trace light through a model of the stone.
- The model gives a score and a Pass or Fail. Stones that fail are not listed, whatever their laboratory cut grade says.
- For each listed stone you can see the simulated views: studio light, a single spotlight, a light-return map, hearts and arrows, and a short loop of the stone tilting the way a ring moves on a hand.
- You can bring your own certificate, from any seller, and see that stone next to ours under the same light.
What we do not do
- We do not photograph the stones. Every picture is a simulation from certificate numbers, and says so.
- We do not hold stock. Stones ship from the cutter's stock to you.
- We do not set stones. If you need a setting, we can point you to makers who do only that.
The name
Two things happened in 1919. Marcel Tolkowsky published Diamond Design, the first calculation of round brilliant proportions from the path of light inside the stone; the proportions it arrived at are still the reference for the cut we sell. The same year the Bauhaus school opened in Weimar, and over the following years it argued for design that starts from function and leaves out what is not needed. "Haus" is taken from the school; 1919 is the year both began. The site is laid out on the same principle: the numbers, the pictures, and as little else as possible.
Where the method comes from
The light-return idea is published science, credited on the Research & credits page. The grading gates, the scoring and the software are ours. What they can and cannot tell you about a stone is set out plainly on Questions and method.