77 Diamonds Blog
27Jul/100

What is an ‘eye clean’ diamond?

Being ‘eye clean’ affects the clarity and quality of a diamond, which will alter the price of any stone. If a diamond is ‘eye clean’ it does not visually show any inclusions or blemishes on the surface or interior when viewed with the naked eye. The diamond may feature an impurity, but it may only be visible with the use of a microscope.

The clarity of a diamond is one of the 4 Cs – Cut, Clarity, Colour and Carat - because it is one of the fundamental attributes to knowing how to judge a diamond.  Clarity becomes especially important if impurities are noticeable to the naked eye in diamond jewellery or engagement rings.

Clarity refers to the level of inclusions such as scratches, blemishes, pockets of air and non-diamond material inside or on the surface of a diamond.  Fewer or less obvious inclusions make diamonds rarer and more highly valued.

What imperfections can a diamond have?

Any rough diamond can suffer from interior or surface imperfections, known as inclusions or blemishes.  Inclusions may be crystals of a foreign material or another diamond crystal, or the presence of structural imperfections such as tiny cracks that appear cloudy or white. Cracks are often known as fracture lines, needles or feathers depending on the mark they leave or their cause.  Internal crystals or marks can appear as singular ‘pinpoints’ or as clusters known as ‘clouds’.

19Jul/100

Famous Pink Diamonds of the World

Both scarce and popular, pink diamonds are extremely sought after and expensive. With the exception of a couple found in India, almost all of the world’s pink diamonds are now produced from one mine in Western Australia: the renowned Argyle Mine. This extreme rarity means that the gems discovered there are considered highly valuable. Have a look at some of the world’s most fascinating, expensive and large pink coloured diamonds!

The Star of the South

This beautiful diamond was cut into a cushion shape and is also known as Estrela do Sul, since it was found by a slave girl in a mine of the same name in Brazil in 1853. It weighs an impressive 128.48 carats (25.70 g) and is graded as a type IIa diamond, with a clarity of VS2 and a colour grading of light pinkish-brown. There is a white reflection of light from the diamond, whereas the refracted light has a definite rose tint which gives the stone a light pink and brown shade.

1Jul/102

Famous Yellow Diamonds of the World

Yellow Diamonds get their colour from nitrogen being present at the time they are formed. The hues of a diamond can range from pale sunshine yellow to bright canary yellow and amber hues. Seventy Seven Diamonds brings you a list of the most exquisite and famous yellow-coloured diamonds that have featured throughout history.  Find about their history, their diamond credentials, and what it is that makes them so famous.

The Sancy Diamond

The most famous yellow diamond is the Sancy; an impressive 55 carat, light yellow diamond what fluoresces yellow and pink. However, it is the story of the diamond that makes it famous. It is thought that the Sancy originally came from India and legend has it that in 1477 the diamond was lost by Charles, Duke of Burgundy during a battle. Its first verified owner became Nicholas Harlai of Sancy, a French Ambassador, who bought the diamond in the late 1500's in Constantinople – hence the derivation of this stone’s name.

16Jun/102

Famous Blue Diamonds of the World

Seventy Seven Diamonds brings you a list of the most exquisite and famous blue-coloured diamonds that have featured throughout history.  Find about their history, their diamond credentials, and what it is that makes them so famous.

The Regent Diamond


This diamond was also commonly known as the Pitt Diamond and was discovered by a slave in the legendary Golconda mine, India, in 1698.  The sparkler wasn’t hard to miss; it weighed an impressive 410 carats.  However, the slave hid the stone and managed to escape to the coast – only to be murdered for the stone by an English sea captain.

The captain sold the stone to an Indian diamond merchant for an estimated £3,431. Thomas Pitt, Governor of Fort George in Madras, then bought the blue stone from the merchant in 1702 for £68,610. Thomas Pitt was grandfather to the famous American Revolutionist William Pitt and he was the one who transported the diamond to England for cutting.

The Regent Diamond is a cushion-shaped, brilliant cut diamond, white in colour but with a faint blue tinge.  It now weighs approximately 140.50 carats and measures around 32mm x 34mm x 25mm. The moulding of the stone took 2 years before it was turned into the charming Regent Diamond – thought to be one of the finest cut diamonds in existence!

4May/100

Diamonds: why it’s a good time to invest

This week the global gem-mining giant De Beers Group revealed that the world’s diamond supplies are running out.  Despite recent economic hardships, the choice to invest in diamonds now may be a wise one.

According to the mining company, diamond mines are getting scarce and will eventually become history.  De Beers has decided to reduce its production in order to extend the life of the mines.

The depletion in diamond mines will have a direct impact on the prices of stones.  Diamond analyst at Royal Bank of Canada Capital Markets, Des Kilalea, explained that owing to the moderated output, diamond prices could rise by at least 5 percent every year for the next five years.

De Beers is responsible for 40 percent of global diamond sales, but this figure is now likely to decline.  The company had an astonishing record of producing 48 million carats per annum, but will now reduce their diamond production to 40 million in 2011.

31Mar/100

The low-down on diamond inclusions

Feather Inclusion - Courtesy of A.G.S.L

Feather Inclusion - Photo courtesy of A.G.S.L

Everybody wants the perfect diamond! Unfortunately, it is extremely rare to find a diamond which does not exhibit any imperfections.  Diamond inclusions are characteristics which exist inside a stone. They are most commonly referred to as flaws, because their presence creates a diamond which is not perfect.   Perfect diamonds are available, but at a high price.  Many of us will look at purchasing diamonds with varying types or numbers of both external and internal flaws.

Inclusions are often described to be like fingerprints, unique features which provide a unique signature.  It is important to get familiar with your diamond, both inside and out, to personalise the gem, to help you identify and describe the gem, and to assess the gem’s clarity and value.

Inclusions may be crystals of a foreign material or another diamond crystal, or the prescence of structural imperfections such as tiny cracks that appear cloudy or white. The size, number, colour, relative location, orientation, and visibility of inclusions can all affect the relative clarity of a diamond. A clarity grade is assigned based on the overall appearance of the stone under 10x magnification.

17Mar/100

35 Interesting Diamond Facts

We have always been facinated by the diamond, and continue to adore its beauty, brilliance and natural perfection.  The diamond is the most wanted gemstone in the world.  But why do we love diamonds so much?  Here is some fun diamond trivia to highlight the wonders of our favourite gemstone.

  1. Diamonds are made of carbon
  2. A diamond is a semi-conductor
  3. Diamond is the best tool for cutting glasses
  4. Round cut diamonds have 58 facets
  5. Diamonds were originally mined in India over 2,800 years ago
  6. There are over 16,000 different classifications of diamonds
  7. Only one diamond in a million will weigh one carat or more
11Mar/100

The story behind the cocktail ring

Diamond Cocktail Ring

Diamond Cocktail Ring

The cocktail ring is the ultimate accessory.  It is styled to be a dramatic, large ring worn at cocktail parties. The cocktail ring design was especially popular to be worn during the US prohibition from 1920-1933 at illegal cocktail parties. Such a statement piece of jewellery flaunted not only the fact that one was drinking illegally, but also that one was doing it with style.

The cocktail ring has been around for centuries. But the unforgettable large size of the ring has always stayed the same. Styles, colours, stones, gold, white gold or platinum are all used to transform your favourite cocktail ring into a completely unique piece which can fit your particular lifestyle, price range and wardrobe.

History of the cocktail ring

The cocktail ring gained its popular status in the 1940s and 1950s, as cocktail soirees became hugely popular events. Although cocktail parties are less of an extravagant affair now, wearing a cocktail ring with huge diamonds or other large precious or semi-precious gems remains a popular choice for formal dressy occasions.  Diamond encrusted or solitaire diamond cocktail rings are especially paraded at glamorous events like premieres of films, Broadway or West End theatre productions, or award shows like the Oscars or Brits.

19Feb/101

Online Buying vs. Brick and Mortar

As the popularity of online shopping is increasing, more and more consumers are trying the convenient services offered by many e-tailers.  But is virtual shopping really an easier, overall improvement on face-to-face buying in physical stores? There are several pros and cons for each shopping method to consider, particularly when you’re looking to purchase a diamond for a special occasion.

Advantages and Disadvantages: Pricing

An online store has very low overhead and since there is no need to pay for retail display space, storage costs are negligible or non-existent. Shipping of the product (e.g. diamonds) is often factory direct, which further reduces warehousing costs and eliminates the expense of multiple shipments to various distributors. All these factors create significant savings that can be passed on to the consumer, and which allow even more moderately sized diamond businesses to successfully compete with their much larger, brick and mortar high street competitors.

A brick and mortar store has unavoidable expenses to contend with. A physical location has to be lighted, heated or cooled which creates electrical and gas expenses. Wages, maintenance, and warehousing costs, plus "shrinkage", e.g. shoplifting, must be accounted for and that too costs the retailer. Stock must be transferred to the shopkeeper before it can be transferred to the consumer. These are all expenses normally avoided by the online stores.

18Feb/100

Diamond Cut Part 2: Crown and Pavilion Angles

In part one of this series we discussed how the Table and Depth Percentage effect the cut of a diamond.

In part of two, we'll take a look at the last two important factors of cut, the crown and pavilion angles, to give you a better idea of what you should be looking for when you purchase a diamond.

The relationship between the crown angle and the pavilion angle has the greatest effect on the appearance of any diamond. A slightly steep pavilion angle can be complemented by a shallower crown angle, and vice versa.