Diamond Number One

Diamond Number One proposes exclusively shiny round diamonds.

Experience & Exigence

Diamond Number One markets diamonds at the Rapaport price, which is the benchmark for quotations used by professionals, and benefits its customers.

Rapaport acts as a global exchange for diamond dealers.

Diamond Number One only markets diamonds from countries that have signed the Kimberley Process, which guarantees traceability and supply chain ethics.

Each Diamond cut is unique


The 4 C’s: Carat, Color, Clarity & Cut, are used to evaluate the precise quality of each diamond.




GIA and / or HRD certification. The two best gemological laboratories in the world, makes the expertise unfalsifiable and indisputable.

The certificate is the identity card of your diamond. Each diamond is a unique piece.

It is essential to invest in diamonds certified by internationally recognized laboratories.

The GIA certificate is the essential solution to facilitate any negotiation at a global level.

The ``4C``

Understanding the ``4C``

The quality and value of a diamond are determined by the ``4C``



The Carat (ct) is the unit of measurement for the weight of the diamond.
One carat weighs 0.20 grams.

The carat of the diamond is different from the carat of other stones or precious metals (emerald, gold, etc ...), the respective densities of the elements being naturally different. The price of a diamond being set at the carat (price per carat) according to the other criteria, it must be taken into consideration that because of the rarity, a diamond weighing 2 carats will not cost twice as much as a diamond d one carat, it can cost three times more ...



A color classification system, on an alphabetical scale starting with the letter D (absolutely colorless), up to the letter Z with a gradually more tinted coloration, determines the color of the diamond.

Diamond Number One only offers diamonds graded from D to H.
D being the exception color.

Diamond Number One offers only diamonds with no fluorescence (fluorescence none), which are among the rarest diamonds.



The purity of the diamond is determined by the number of visible inclusions in the stone.

Scale of purity:
IF (internally flawless)
VVS1 (very very small one)
VVS2 (very very small two)
VS1 (very small one)
VS2 (very small two)
SI1, SI2, SI3, P1, P2, P3

Diamond Number One selects only: IF, VVS1, VVS2, VS1 and VS2.



Polishing - Symmetry - Fluorescence

The size and finish of the stone are referred to as ``size``. The size determines the fires and brilliance, the flicker of the diamond.

The cut diamond consists of four parts:
the crown
the 'rondiste'
the culet

The round brilliant cut has 57 facets.



Diamonds certified by GIA institutes, HRD, … international references.

The price of rarity

The rarity of large diamonds generates exponential prices.


You can apply for the Diamond Number One commercial service for over-the-counter resale after two years of possession. In this case, a participation in the transaction costs will amount to 10% VAT on the sales price including tax. Upon resale, the customer benefits from the Rapaport price on the day of the transaction.

Diamond has a real intrinsic value, linked to the operating costs of the entire production chain.

The benefits of certified diamond

Tangible assets







Tax system

Donation and Succession

International value



Contact Us

A team of recognized and qualified professionals is at your disposal to help you in the choice of an investment in adequacy with your situation.

To contact one of our consultants, please complete the form below.

Contact Europe

Diamond Number One

Rue Ferdinand Hodler , 9


Contact Mauritius

Diamond Number One Ltd

Tél : + 230 268 0208
Port: + 230 5947 7450

Villa Royale – Villa N° 4 – Royal Road
La Salette – Grand Baie
Republic of Mauritius

A company incorporated under the law of the Republic of Mauritius
Incorporation N° C 143304
Business Registration N° C 16143304