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Champagne and Cognac Diamonds

A champagne diamond is a natural brown diamond of light to medium tone, and a cognac diamond is a natural brown diamond of deeper, often orangy tone; both are trade names for stones that GIA grades as brown. Brown is the most common fancy colour, so value depends on tone, saturation and the warmth of the modifier rather than on rarity alone. Byrex Gems offers champagne and cognac diamonds to the trade from Toronto, with GIA reports, filmed unedited, with prices shown to approved buyers and viewings by appointment.

Where to buy champagne and cognac diamonds in Toronto

Byrex Gems lists 59 champagne and cognac diamonds online today. 56 of them come with a report from laboratories including GIA and HRD. Viewings are at our Toronto office, 27 Queen Street East, Suite 407, steps from Queen subway station, by appointment. We have supplied coloured gemstones and natural fancy colour diamonds to jewellers and designers since 1988, and welcome private clients by appointment. Prices are shown to approved trade accounts; private clients can ask us on WhatsApp, where we reply within 12 hours, or by email within 24 hours. Every stone ships insured, worldwide.

Among the champagne and cognac diamonds listed today: 2.03 ct Round Fancy Intense Yellowish Brown Diamond, HRD, 1.64 ct Princess Fancy Intense Brown Diamond, HRD, 1.60 ct Pear Fancy Pinkish Brown Diamond, GIA, 1.50 ct Cushion Fancy Deep Orange Brown Diamond, GIA, 1.39 ct Pear Fancy Pinkish Brown Diamond, GIA, 1.07 ct Round Fancy Intense Brown Diamond, HRD, 1.02 ct Radiant Faint Pinkish Brown Diamond, GIA, 0.16 ct Heart Fancy Light Pinkish Brown Diamond, GIA, 10.05 ct Cushion Grayish Brown Diamond, HRD, 10.03 ct Square Fancy Dark Greenish Yellow Brown Diamond, GIA, 4.11 ct Radiant Fancy Dark Greenish Brown Diamond, GIA, 4.02 ct Radiant Fancy Dark Pinkish Brown Diamond, GIA and 47 more.

What are champagne and cognac diamonds?

Champagne and cognac are names the trade gives to natural brown diamonds, borrowed from the colours of the drinks. Champagne describes the lighter, softer browns with a hint of yellow; cognac describes the deeper browns with an orange or reddish warmth. Neither word appears on a laboratory report, where the stone is simply brown, with modifiers and a grade.

The colour comes from plastic deformation, the same lattice distortion that produces pink. Under magnification the brown is often concentrated in parallel bands called graining, and the strength of the colour depends on how much deformation the crystal suffered. Some browns also carry nitrogen, which adds yellow and gives the champagne tints; those that lean orange or red are the cognacs.

Brown is the most common fancy colour in nature and is found at every diamond mine. The Argyle mine in Western Australia produced browns in enormous quantity and, from the 1980s onward, marketed them under the champagne and cognac names with its own grading scale, which turned a colour once sent to industry into a jewellery category. Since Argyle's closure in November 2020, browns continue to come from South Africa, Russia, Botswana, Brazil and Canada, and supply remains steady.

GIA brown grades and the Argyle C scale

GIA grades brown as a fancy colour once it is stronger than the Z master, in the same way as yellow. Lighter browns receive a D to Z letter grade, and a report may describe such a stone as light brown. Beyond Z the grades are Fancy Light, Fancy, Fancy Dark and Fancy Deep brown; the Fancy Intense and Fancy Vivid grades are not used for brown, because brown is a low-saturation colour by definition and its range is expressed through tone. Modifiers appear often: yellowish brown, orangy brown, orange-brown, pinkish brown, reddish brown and grayish brown are all used, and the last hue named is dominant.

Argyle graded its browns on a scale from C1 to C7. C1 and C2 are light champagne, C3 and C4 medium champagne, C5 and C6 dark champagne, and C7 cognac. The scale is Argyle's, not a laboratory's, and does not map exactly onto GIA grades.

The report states colour origin. Brown is rarely treated to be brown, but HPHT treatment can turn some brown diamonds colourless, yellow or yellowish green, and brown stones are the usual starting material. Any treatment must be disclosed. Laboratories detect it by inclusions, spectra and trace-element chemistry.

What a jeweller should check before buying

Confirm the report and inscription, then look at the colour as it will arrive. Brown depends on tone more than saturation, so the first question is whether the stone reads as a warm champagne, a rich cognac or a dull, greyish brown. The modifier decides this: orangy and reddish browns are warm and sell, yellowish browns are soft and pleasant, grayish browns are flat and are valued accordingly. Byrex films every brown unedited so the warmth of the modifier can be judged in daylight.

Cut matters as in all fancy colours. Cushion, radiant and oval shapes hold the colour; round brilliants show a lighter, livelier brown that suits champagne tints. In cognac stones, check that the body colour is even and that graining does not create a hazy look, which is common in strongly deformed crystals.

Clarity is where brown differs from other fancy colours. Because browns are plentiful, buyers expect clean stones, and VS clarity is the normal standard for a champagne above a carat. Browns are the fancy colour in which pairs, calibrated side stones and layouts are easiest to assemble, and Byrex keeps matched goods for earrings and multi-stone pieces, matched on tone and modifier first.

What drives the value of a brown diamond

Brown follows a different value logic from pink or blue. Rarity does not set the price, because brown is the most common fancy colour; what sets it is how attractive the particular brown is. Warmth leads: an orangy brown or reddish brown of good tone, the cognac of the trade, is valued above a plain brown of the same grade, and a pinkish brown above that, since pink lifts the colour toward a scarcer hue. Grayish brown and olive-leaning stones sit at the bottom.

Tone is the next factor. Medium and deep tones with clear colour, the C4 to C7 of Argyle's scale in trade language, are preferred for centre stones; the lightest champagnes are used mainly in pave and side-stone work.

Clarity and cut carry more weight than in rarer colours, because buyers can afford to be selective. Size matters, but the steps are gentler than in pink or blue, and large browns are available; what is scarce is a large brown with warmth, even colour and high clarity. Argyle provenance adds a modest premium in cognac stones since the mine closed. Byrex shows full trade prices to approved accounts and does not publish prices.

The Golden Jubilee and how brown became a category

The largest faceted diamond in the world is brown. The Golden Jubilee, found at the Premier mine in South Africa in 1985 and cut by Gabriel Tolkowsky, was described by GIA as a Fancy yellow-brown and was presented to the King of Thailand in 1996 to mark the fiftieth year of his reign.

For most of the twentieth century brown diamonds were sorted out of gem production and sold for industrial use. That changed when Argyle, whose output was mostly brown, began marketing them in the 1980s under the champagne and cognac names with a grading scale of its own. The campaign worked: brown became a jewellery colour, designers adopted it for its warmth and its price, and laboratories began grading it with the same care as other fancy colours.

The market since Argyle's closure in November 2020 has been steady. Browns remain available from every major producing country, laboratory-grown browns exist but have little demand, and treated colours such as HPHT-processed yellow and colourless often begin as brown rough, which is why disclosure matters more in this colour than its price suggests. Byrex offers only natural browns and quotes the report wording on every stone page.

Buying brown diamonds from Byrex Gems

Byrex Gems has been in Toronto since 1988, and more than seven thousand trade customers in Canada and abroad have bought from us. Many of our champagne and cognac diamonds come with reports from GIA and other leading laboratories; all of them are filmed in our office, unedited and unfiltered.

Approved trade buyers see prices online. Others may write at any hour: WhatsApp +1 (437) 450-3786 is answered within hours and email to info@byrex.com the same day, seven days a week. What is listed is a part of what we hold: more matched pairs and parcels are kept in the vault, and what we do not hold ourselves we can source through our offices worldwide. Private viewings are arranged by appointment in Toronto, Hong Kong, Bangkok and Dubai.

Champagne and Cognac Diamonds: questions buyers ask

Is champagne a GIA grade?

No. Champagne and cognac are trade names for light and deep brown diamonds. GIA grades the stone as brown, with modifiers such as orangy brown and a grade from Fancy Light to Fancy Deep, and the report never uses the drink names.

What is the difference between champagne and cognac?

Tone and warmth. Champagne describes lighter browns, often with a hint of yellow, and cognac describes deeper browns with an orange or reddish warmth. On Argyle's scale, C1 to C6 are champagne grades and C7 is cognac.

What do C1 to C7 mean?

They are Argyle's own brown grades. C1 and C2 are light champagne, C3 and C4 medium champagne, C5 and C6 dark champagne and C7 cognac. The scale is Argyle's, not a laboratory's, and sits beside a GIA grade.

Are champagne and cognac diamonds treated?

Natural champagne and cognac diamonds are not. Brown is rarely treated to be brown, but brown rough is the usual starting material for HPHT treatment that produces colourless or yellow stones, so disclosure matters and the GIA colour origin line should be read.

Do Byrex brown diamonds have GIA reports?

Most do. GIA grades the majority of our champagne and cognac diamonds, and the report wording, including the modifier, is quoted on each stone page. Calibrated small goods may carry other recognised laboratory reports, which is stated.

Does Byrex keep matched pairs of champagne diamonds?

Yes. Brown is the fancy colour in which pairs, side stones and layouts are easiest to assemble, and Byrex keeps matched goods for earrings and multi-stone work, matched on tone and modifier before size. Layouts can be assembled to order.

Does Byrex sell champagne diamonds to private clients?

Yes. Byrex sells first to jewellers and designers, but private clients are welcome by appointment at 27 Queen Street East in Toronto, where browns can be compared in daylight and reserved for a jeweller to set.

Can I view champagne and cognac diamonds in Toronto?

Yes. Viewings are by appointment at 27 Queen Street East, Suite 407, Toronto. Warmth of tone is best judged in person, and stones can be compared with each other and against yellow, rose and white metal.

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