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Maison / Crystal / Aurora Obelisk
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Crystal Obelisks

Aurora Crystal Obelisk

A 12-inch optical-grade K9 obelisk, hand-cut with 24 facets to refract morning light into a single long white line. Signed by Josef Krejcí. Limited edition, No. 04 of 250.

★★★★★ 4.9 284 reviews · 218 Q&A · 2,140 households
$189
4 payments of $189 · Free shipping · SKU LUM-AUR-12

Specifications 5 details

Crystal finish 1 of 1

1
Ships from Karlovy Vary · 2–4 days
100-year warranty
Free re-polish for life
Worldwide shipping
Insured, signed delivery
Master-signed
Certificate of authenticity
The piece, in detail

What you are looking at.

Every LUMIÈRE object carries the marks of the atelier. The optical clarity, the 24-facet precision, the refraction spectrum, the master signature. These are not renders — these are the eight-hand details our collectors fall for.

24-facet precision
01

24-facet precision

Each facet cut within 0.05mm tolerance. The 4.2 lb obelisk refracts a single white line at 32° from apex — measured to within a hair's width.

Optical clarity
02

Optical clarity

K9 crystal, refractive index nd = 1.523, lead-free. Surface roughness < 0.02µm — ten times smoother than a mirror, inspected under a single lamp against black velvet.

Light through facets
03

Light through facets

Place it in a south-facing window at noon and the full visible spectrum — 380 to 740 nm — falls on the wall in a single clean prism. No diffusion, no noise.

Hand-polished surface
04

Hand-polished surface

Wooden wheel with fine pumice. Every facet is checked against the atelier lamp; any bubble, chip, or asymmetry sends the piece back to rough cut — rare, but it happens.

Refraction spectrum
05

Refraction spectrum

Cut from a single 14-lb K9 block, annealed for 90 days to remove internal stress. Only the clearest 30% survives to become a LUMIÈRE object.

Master signature
06

Master signature

Etched on the underside by the master cutter who finished it, with the maison mark and edition number — No. 04 / 250. Comes with a black velvet box and certificate of authenticity.

How it is made

Eight hands, two weeks.

From a 14-pound block of optical K9 to a signed, polished object — each piece passes through eight pairs of hands, each step adding one to thirty-two hours of work.

Block Selection

Optical-grade K9 ingot, annealed for 90 days to remove internal stress. Only the clearest 30% survives.

i
Master cutter
Day 1

Score & Cleave

The rough form is scored with a diamond point and split along the crystal's natural plane.

ii
Bench hand
Day 2–3

Rough Cut

Iron-bonded diamond wheel brings the piece within 2mm of final dimensions.

iii
Cutter's apprentice
Day 4–5

Fine Cut

24 facets are cut one by one, each at a measured angle, on a copper wheel charged with carborundum.

iv
Master cutter
Day 6–9

Polish

Wooden wheel with fine pumice brings the surface to optical clarity. Every facet is checked against the lamp.

v
Polisher
Day 10–11

Inspect

The piece is held against black velvet under a single lamp. The master looks for bubbles, chips, or asymmetry.

vi
Atelier director
Day 12

Engrave

If commissioned, an engraver cuts the maison mark, edition number, or a private monogram in intaglio.

vii
Engraver
Day 13–14

Sign & Number

The master cutter's etched signature and edition number (e.g. 04 / 250) are added by hand. The piece is boxed in black velvet.

viii
Master cutter
Day 15
A day in crystal

Four lights, one object.

A LUMIÈRE object never looks the same twice. Placed where the morning enters, it sparks white. In a south window at noon it throws prismatic rain. At sunset it glows amber. By candlelight, it flickers like a held breath.

Morning light
07:00 · 3200K
Sunrise sparkle
East window · low angle
Noon light
12:30 · 5600K
Prismatic rain
South wall · direct sun
Sunset light
18:45 · 2200K
Amber glow
West window · golden hour
Candlelight
22:00 · 1800K
Flickering gold
Mantel · candlelight
Atelier notes

The engineering.

Every spec verified by our atelier in Karlovy Vary. We publish full measurements and inspection data — if you want the white paper, email the master.

Pairs well withComplete the collection.