CTJ Education
Shine Brighter with CTJ’s Jewelry Knowledge Hub.
Mined Diamonds
– Made of carbon
– Grown in the earth over millions of years.
– Can contain impurities like nitrogen and boron
– No guarantee of conflict free
– Certified by GIA and IGI
Is It A Diamond?
Diamonds
A diamond symbolises emotions.
It represents what matters most to us.
Love, Memories and Family.
Lab Grown Diamonds
– Made of 100% carbon
– Ethical option
– Grown in weeks in a highly controled environment
– Purest form of diamond used. to grow, a type IIA diamond seed
– Certified by GIA and IGI
The CVD Process
Growing Lab Diamonds
There are two techniques commonly used
to grow diamonds.
CVD (Chemical Vapor Deposition)
HPHT (High Pressure High Temperature)
Know Your 4C’s
The first step in finding the perfect diamond is understanding the 4C’s (colour, clarity, cut and carat).
This scale created by the GIA is used to determine the visual traits, quality and value of a diamond.
Colour
The colour grade is the evaluation of the amount of colour in a diamond.
Colour in a diamond is due to the presence of clements such as nitrogen and boron during the growth process.
For white diamonds the less colour a diamond shows the higher the value.
Clarity
During the diamond growth process, internal imperfections form inside the diamond. These are known as inclusions.
The clarity grading of a diamond indicates the amount of inclusions that are present. How visible they are and their location in the diamond.
Inclusions in a diamond are often discribed as “birthmarks”. They make your diamond unique and one-of-a-kind.
Cut
This is one of the most important C’s. It measures how well the stone is cut and how light interacts with the facets in the diamond.
This will determine the fire, brilliance and scintillation(sparkle) of a diamond.
The GIA bases a diamonds cut grade on seven components brightness, fire, scintillation, weight ratio, durability, polish and symmetry.
Carat
Carat is the weight of a diamond. It is a major influence in a diamonds value. The higher the carat weight the higher the value.
Two 2cl diamonds can have different measurements based the quality of their cuts.
AL CTJ we source stones that have a balance between having a large face up value but not cut too shallow where light leakage is present.
About Us
The founder of CTJ Jewellery, first delved into the world of diamonds in the early 1970s’. He cultivated his passion for jewellery and the concept of CTJ was created, backed by the idea of making fine jewellery affordable. At CTJ we believe jewellery should be attainable and not just sitting in a window leaving you wondering, will I ever be able to afford a piece like that?
CTJ imports diamonds and gemstones directly from manufacturers and cutters, allowing us to offer wholesale prices directly to the public. As Australia’s largest diamond wholesaler, we have a vast inventory of natural diamonds and lab grown diamonds in-store, ready for you to see, touch, and feel—not just view on a computer screen. Visit our Bundall showroom on the Gold Coast to experience the beauty and quality of our diamonds firsthand. With a fully equipped workshop on-site and jewellers boasting over 25 years of experience, CTJ is dedicated to crafting and repairing jewellery with exceptional care and expert craftsmanship. Discover the perfect piece that reflects your style at CTJ Jewellery, where quality meets affordability.