Color type of ruby

Briefly describe the color types of ruby in NQTC gemology.

In recent years, the NQTC gemstone laboratory has been dedicated to the historical study of rubies, and with our extensive experience on these stones, we can well define these color types. Our definitions are firmly rooted in history and direct experience, while understanding that definitions need to be flexible enough to account for gems from recent sources unknown to the ancients.
At the request of the customer, our report features a color type. We understand that the client wants a neutrals to determine whether a ruby is of the "dove red" type.
At the same time, we understand that one cannot dictate to others what is beautiful or attractive; It depends on the individual. It tastes like sashimi and can only be served fresh. 
Therefore, we stress that the final judgment on the value of a gem should always be based on what the buyer thinks is beautiful, not what others believe. In addition, gems must be personally identified, not through photographs or gem identification reports. For direct experience, photographs or text are poor fidelity, and low resolution medium for describing complex and subtle objects. There is no substitute for direct experience.
Important notes on gemology:
The appearance of "color type" is also affected by cutting, clarity, multicolor, and in some cases fluorescence.
Each of these color types contains a range, not just a color.
Some colors that we can see with our naked eyes are not reproducible either in print or on the screen. These are called extraterritorial colors.
All colors are affected by the spectral output distribution (SPD) of the light source used to observe them.
Dove blood
According to our research, this type of color first appeared in English in 1839. It is said to have originated in China or India, but everyone agrees that it is a traditional term used to describe the best color of ruby. Most mogak rubies are purple. Few stones are red. It's a glowing color, not like a red traffic light. The blood color of pigeons is not unique to myanmar; Stones of this color have also been found in Burma, Vietnam, mozambique, and Tanzania.
The royal red
The colour is darker than the blood of a dove and is traditionally known in Burma as "rabbit blood". These rubies often contain more iron than the pigeon's blood type. This reduces fluorescence and blue transmission, making the stone a darker, purer red. Royal rubies are found in mozambique, Thailand/Cambodia, Kenya and Madagascar.
According to personal opinion, this color can be classified as pink sapphire or ruby. What makes bright pink "hot" is that the stones transmit more blue to purple wavelengths. This is because the iron content is relatively low compared to chromium. The result is a little more blue-red and a lot more fluorescence in red. Stones of this color are usually from low iron ore deposits. Almost all Himalayan deposits (tajikistan, Afghanistan, Pakistan, Nepal, myanmar, Vietnam, yunnan (China)) can produce this color, as can some deposits in East Africa (mozambique, Tanzania).
Named after Burgundy, a strong Burgundy that is redder than bright pink. The colored stones come from a variety of sources, including Burma, Sri Lanka, mozambique, Vietnam, Afghanistan and Tanzania.