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Coloured Gemstones

What are gemstones?

Gemstones are naturally occurring mineral crystals which are cut and refined to create beautiful pieces of jewellery. They are categorised as precious or semi-precious stones. Since gemstones are formed in the earth, they have naturally occurring internal flaws known as birthmarks or inclusions.

Gemstones are also characterised in terms of dispersion, hardness, specific gravity, refractive index, lustre, fracture, and cleavage. Diamond is the hardest gemstone on earth and has an exceptionally high index of refraction.

Precious Gemstones

What is the difference between a precious stone and a semi-precious stone?

Gemstones are classified into precious stones and semi-precious stones. Precious stones include: diamonds, sapphires, rubies and emeralds. All other stones are considered to be semi-precious stones. So contextually there is a difference between semi-precious and precious gemstones but it is also is a classification process for gemstones and for customers.

Why are coloured gemstones so sought after?

Coloured gemstones have been popular among jewellery enthusiasts for centuries. Beauty is in the eye of the beholder. It can be the rarity of the gemstone, its’ colour and clarity that can be highly attractive to buyers. In more recent years, Sapphires, Tanzanites and Tsavorite garnets have seen a surge in popularity. Coloured gemstones are mesmerizing and can certainly enhance a person’s look and outfit. “Birthstones” are gemstones, which are associated with the different calendar months of the year for example, the birthstone for October is an Opal. Jewellery holds sentimental meaning and lasts a life-time. Coloured gemstone jewellery has been consistently popular as engagement rings giving customers more options according to their preferences and budget.

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What is a black diamond and why are black diamonds so popular?

Diamonds occur naturally in a variety of different colours including the colour black. Surprisingly, naturally occurring black diamonds are not easy to find and are quite rare. Black diamonds remain amongst the most popular of all coloured diamonds. Natural black diamonds or “carbonado” stones have the same chemical composition as white diamonds. Black diamonds have a unique structure and many inclusions, which affects how they reflect light, most, of which is absorbed by the stone, hence they appear black in colour.

Black and white diamonds set together provide stunning contrasting colours in fine jewellery. Black diamonds are extremely versatile and can dress up or dress down an outfit. Black and white diamond jewellery looks elegant and luxurious whilst lowering the cost. Although there are diamonds that have been artificially dyed black, at ANNABELLA DIAMONDS we do not sell any man-made or artificially changed black diamonds.

Why they are so popular also often refers to the theory of how black diamonds are formed. During laboratory testing, black diamonds were found to contain high levels of hydrogen-carbons bonds which means they were formed in a hydrogen rich atmosphere which you would have found billions of years ago in an exploding star in space. Many people believe that black diamonds fell to Earth inside meteorites. In some cultures, black diamonds are thought to be protective against negative emotions and are given as gifts at the start of a new relationship.  

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Gemstones Chart

Coloured Gemstones Chart

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