Hyperluminous·Loose IGI-graded diamonds

The colour of nothing.

Private viewing, by appointment, at Black Garter, Sydney. Delivery, insured, throughout Australia.

Request a private viewing
No. 01 / Hyperluminous
est. 2026 — Sydney, AU
A black-and-gold cathedral
↓   scroll

— A note before the catalogue

We sell loose, IGI-graded diamonds, at the absolute lowest prices in Australia. That is the entire argument. There is no marketing paragraph to soften it, no loyalty program, no newsletter. A diamond is a small piece of carbon that has survived more than the rest of us. You do not need a sales letter. You need a price and a place to look at it.

The catalogue is below. Each stone is photographed under single-source, museum-grade lighting and accompanied by its IGI certificate. The price is the price. We will beat any verifiable Australian competitor's price on an identical stone by ten percent — that is the guarantee, in writing, on the provenance page.

— H., curator

  1. I.Absolute lowest. Ten percent under any verifiable Australian competitor on an identical stone.
  2. II.Every stone carries its IGI certificate. The certificate is the stone's biography; we do not retell it.
  3. III.Five business days from payment cleared to your door, anywhere in Australia. Insured, signature-required.
  4. IV.Private viewing at the Black Garter showroom in Sydney, by appointment, in a room with the curtains drawn.
  5. V.No phone calls unless you ask for one. No follow-up emails. The relationship ends when you leave.

— Five stones, currently in the room

A short catalogue.

0.30ct F VS1 Round Brilliant

0.30ct · F · VS1 · Round Brilliant

IGI LG 6133·4182

$765AUD

0.50ct G VS2 Round Brilliant

0.50ct · G · VS2 · Round Brilliant

IGI LG 6133·4201

$1,980AUD

1.00ct H SI1 Round Brilliant

1.00ct · H · SI1 · Round Brilliant

IGI LG 6133·4228

$8,100AUD

1.00ct Fancy Yellow Pear

1.00ct · Fancy Yellow · VVS2 · Pear

IGI LG 6231·0094

$16,200AUD

2.00ct Fancy Blue Cushion

2.00ct · Fancy Blue · I1 · Cushion

IGI LG 6231·0117

$162,000AUD

See the full catalogue

— The Showroom

A room with the
curtains drawn.

One room at the Black Garter in Sydney, dressed in black velvet and a single brass lamp. By appointment. The stone is brought out. You sit with it. There is no hurry, no script, and no one trying to sell you anything.

Plan a visit

A diamond is a small piece of carbon

that has survived more

than the rest of us.

Request a private viewing