The Perfect Diamond Collection

“I never expected to find it here in Japan”

52.09-carat Perfect Diamond
D Colour · Flawless · Triple Excellent · Type IIa

52.09 · 30.14 · 20.23 CT

The Story

“I never expected to find it here in Japan.” More than one professional diamond dealer has expressed this surprise on seeing the 52.09-carat diamond in person. D colour, Flawless clarity, Triple Excellent and Type IIa together at such a substantial weight are an uncommon combination. We invite you to Amazing Grace to discover our 52.09-, 30.14- and 20.23-carat Perfect Diamonds.

52.09 carats · The actual diamond on the hand

52.09 CT / THE PRESENCE

52.09 ct
Perfect Diamonds

D colour: completely colourless. Flawless: no inclusions or blemishes visible under 10× magnification. Cut, polish and symmetry are all graded Excellent. It is also classified as Type IIa, with exceptionally low levels of impurities.

According to the company’s current product information, this 52.09-carat Perfect Diamond is the world’s largest currently offered for sale that combines D colour, Flawless clarity, Triple Excellent and Type IIa.

52.09 ctThe world’s largest Perfect Diamond

D / FLColourless · Flawless

3EX / Type IIaExcellent cut · Exceptional purity

PERFECT DIAMOND

Four qualities of a Perfect Diamond

From colour and clarity to cut and crystal type, discover what makes this diamond exceptional.

D Colour · Completely colourless

D is the highest colour grade on the colourless-to-light diamond grading scale, representing an absence of colour.

FL · Flawless

A skilled grader sees no inclusions or blemishes under 10× magnification. It is the highest clarity grade.

3EX · Triple Excellent

Cut, polish and symmetry are each graded Excellent.

Type IIa · Exceptional crystal purity

Very low levels of nitrogen and other impurities characterise this diamond type. Type IIa is a crystal classification, rather than a clarity grade.

Round brilliant diamond from the collection · Profile

THE BRILLIANCE

Beyond expectation
Extraordinary brilliance

A slight change of angle brings alternating flashes of bright white light and colourful fire. At 52.09 carats, every change of light is vividly expressed.

A photograph can capture the outline, but never the full brilliance of the actual diamond. Its beauty deserves to be seen in person.

Beyond the camera

Television crews have arrived with professional equipment, only to find the diamond’s intense brilliance difficult to bring into focus.

Even a professional lens cannot fully convey its beauty. Beyond the photographs and footage, there is more brilliance to discover in person.

GIA GRADING REPORT

GIA Diamond Report

The GIA report records the weight, D colour, Flawless clarity and Excellent grades for cut, polish and symmetry. A separate letter documents its Type IIa classification.

GIA REPORT BOOK

52.09-carat GIA Report Book

Created by GIA for this 52.09-carat diamond, the report book records its weight, quality and individual characteristics.

The video below presents selected pages of the physical book.

30.14 and 20.23 carats
Perfect Diamonds

Exceptional quality, expressed at different scales. Discover the 30.14- and 20.23-carat round diamonds.

Provided by the Chairman: round diamonds exceeding 30 carats

30.14 CT / PERFECT DIAMOND

30.14 CT
Perfect Diamonds

30.14 carats, D colour, Flawless clarity, Triple Excellent and a Type IIa crystal. Its distinction lies not only in a weight exceeding 30 carats, but in the combination of all these qualities.

Its weight and quality are documented in a GIA report book.

GIA PORTRAIT REPORT

30.14-carat GIA Report Book

The GIA Portrait Report records a weight of 30.14 carats, D colour, Flawless clarity and Excellent grades for cut, polish and symmetry.

20.23 carats · The actual diamond on the hand

20.23 CT / PERFECT DIAMOND

20.23 CT
Perfect Diamonds

D colour, Flawless clarity, Triple Excellent and Type IIa: this 20.23-carat diamond also combines all four qualities of a Perfect Diamond.

Its creation is documented from planning the rough to cutting and polishing. To commemorate its completion in 2023, the final weight was set at 20.23 carats, making the year part of the diamond’s story.

FROM ROUGH TO BRILLIANCE

From rough crystal to finished jewel
The creation of a 20.23-carat diamond

What possibilities lie within a rough crystal? Internal scanning and computer analysis help the cutter plan the positions, shapes and arrangement of the finished stones. Marking, cutting and polishing gradually reveal the outline of the round diamond.

From rough crystal to finished jewel, the brilliance of 20.23 carats reflects every decision and every stage of craftsmanship.

Marking and working the rough for the 20.23-carat diamond

Analysis of the rough and proposed arrangement of finished stones

20.23 CT / IN MOTION

20.23 carats in motion

As the diamond turns, bright white light and colourful fire appear in succession. Play the video to appreciate the finished diamond in motion.

20.23-carat finished diamond (play video)

THE PARTICULARS

Jewel Details