What are the different characteristics of rubies, sapphires and emeralds?
As mentioned above, red rubies score 9 out of 10 on the Mohs hardness scale - a very high score. In general, rubies are rather small. You are not likely to come across rubies with a high carat weight (higher than 3 carats) because those are very rare. In general, rubies are rarer than diamonds. Rubies are always red, although different hues exist. The brighter the blood-red colour, the more precious that ruby is.
Sapphires come in many colours, just like diamonds, but the iconic blue sapphires are the most precious and have the highest value. Just like rubies, sapphires are generally small and weigh less than 4 carats.
Thanks to their strong inclusions, emeralds are unique and easily distinguishable for experts. Very bright green emeralds with a high clarity level are the rarest and thus the most prized among collectors, so investing in emeralds could be a great option. In early 2018, an emerald at an auction of Christie’s sold for 5.5 million USD.
The property that rubies, sapphires and emeralds have in common is that they are coloured. This has worked to their advantage in the last few years, as the gemstone market is shifting towards coloured gems.