The emerald has over the last decade seen resurgence in popularity. The emerald’s rich green colour adds glamour and sophistication to any women’s jewellery collection. With the emerald taking centre stage once again amongst the rich and famous, a general increase in demand and value was noted, making it not only stunningly wearable but a great investment.
Like any stone, the qualities that govern its investment potential come from the same qualities one would consider when buying a diamond. With the right knowledge, investing in emeralds can reap rewards. The better the quality, the better the returns over the long run.
The C’s that govern the Emerald’s value.
The emerald’s number one indicator of quality will be its colour. The most desirable emerald colours are bluish green to pure green. A great emerald is also highly transparent because its colour is spread evenly with no eye-visible colour zoning. An intensely green coloured emerald is extremely rare.
Most emeralds contain inclusions that are visible to the eye. Once you know this, it becomes easier to further asses the overall quality of the emerald and accept any inclusion you might see. However, if the inclusion has a negative effect on the transparency and clarity the value of the emerald is reduced. Eye-clean emeralds are especially valuable because they are so rare. *see notes on enhancement.
Almost all emeralds are enhanced with what the trade call ‘natural oil’. Oils are used to enhance the overall appearance of the stone. Both the GIA and CDTEC labs more correctly describe oils as ‘artificial resins’. It should be noted that Minor or Moderate treatment is entirely normal.
‘SIGNIFICIANT’ treatment will have a negative effect on the price of the stone. A stone with no treatment is VERY RARE.
The cut of the emerald is an important part of its overall appeal. The cutter has taken all the factors that make up the stone to bring out its best. From how the colour is distributed to where any inclusion might be. The emerald is a more brittle stone so a good cutter will also consider the cut that will minimise and damage to the stone.
Emerald stones can be found as small as 0.02carats and as big as 20 carats.
Why Columbian Emeralds?
Colombian emeralds have a vibrancy in their colour which cannot be found in emeralds sourced from other regions. The finest Colombian emeralds are often more valuable than the same size fine diamond.
The colour of emeralds are closely linked to the location of where they are mined. The concentration or absence of the chromium, vanadium and iron which provide the emerald’s colour will dictate the richness of greens and the hues of blue.
Castellani source emeralds direct from miners and traders in the heart of Bogota, Colombia ensuring the best possible price for the customer by cutting out a multitude of middle-men.
Are emeralds treated?
Generally emeralds are treated and oiled as part of the post-lapidary process improving their clarity and stability.
Gems are graded on a scale of; none, insignificant, minor, moderate and significant. These categories reflect levels of enhancement, not clarity. A gem graded none on the enhancement scale may still exhibit visible inclusions.
Laboratories tend to apply these criteria differently. Some gem labs consider the mere presence of oil or polymers to constitute enhancement.
Given that the vast majority of all emeralds are treated as described above, and the fact that two stones that appear visually similar may actually be quite far apart in treatment level and therefore in value, a consumer considering a purchase of an expensive emerald is well advised to insist upon a treatment report from a reputable gemological laboratory.
Our Colombian Emeralds have been graded by the strict CDTEC Lab in Colombia. Using the latest technology in grading and committed to quality and credibility, the lab offers reliable grading and classification.
How do I care for Emeralds:
- Treat with love and care – put your emeralds on after you have showered and dressed, applied makeup, lotions, perfume and hairspray.
- Avoid ammonia, dishwashing liquid – it is not good to expose many types of jewellery to harsh cleaning chemicals.
- Be careful not to knock your emeralds against a hard surface – treat with care as you would your best diamonds. All stones can chip, crack or be damaged if care is not taken.
- You can choose to clean your emerald occasionally in warm soapy water and rinse well, however you are best to take it to be professionally cleaned every few years if you wear your emeralds on a regular basis.
Please refer to the GIA website for further information on looking after your emeralds.