Ruby the Birthstone of July
Ruby (red variety) is a variety of mineral from the family corundum, Ruby is the most valuable variety of the corundum mineral species, which also includes sapphire (blue corrundum). All other coloured corundum is called a sapphire proceeded by its colour, ie orange sapphire, blue sapphire, yellow sapphire, pink sapphire.
The strength of ruby’s red depends on how much chromium is present—the more chromium, the stronger the red colour.
When does a ruby become a pink sapphire?? There is no international standard for the colour saturation of ruby, the only overall prevailing standard seems to be, is if you are selling, its a ruby if you are buying its a pink sapphire.
Rubies can command the highest per-carat price of any coloured stone. This makes ruby one of the most important gems in the coloured stone market.
In 2014 an 8ct ruby ring sold for $8,500,000 US dollars at a Sothebys auction.
The name Ruby has been historically given to many red stones including garnets and red spinels. Many historical famous royal jewellery included the Black Prince Ruby, on a royal crown is the Tower of London is in actual fact not a ruby but a red spinel. In fact most historical famous rubies are actually spinels.
Rubies are often heat treated and fractures filled to improve there colour and clarity. A large flawless ruby is extremely rare and very expensive. Many of the rubies we see on the market today come from Burma (Myanmar), Thailand Sri Lanka and Africa, Kenya, Tanzania,and Afghanistan. .Mozambique recently became the worlds largest supplier of ruby.
The oldest rubies on record is 2.7 billion years old from the Greenland Aappaluttoq mine.
Ruby is the birthstone of July and is known as a protective stone.
It is believed to promote happiness, love, nuturing, good health, creativity, compassion, knowledge and wisdom
Corundum is a hard stone and rated 2nd after diamond on the Moh’s Hardness scale and has a rating of 9, which is why it makes a great stone for rings as it is very difficult to damage.
Whether it is a faceted cut, or a cabochon, the ruby is an amazing and beautiful stone, my favourite being the star ruby, where, due to inclusions in the stone, and when cut as a cabochon you get this stunning 6 pointed star effect on the surface of the stone called asterism.
Maybe your next jewellery purchase will be a ruby?