Ruby

Price
Retail price for 0.5-0.9 carat heated ruby:
Quality from high to low 
Very good color: $1250-$6000/ct
Good color: $1000-$4000/ct
Fair color: $450-$1000/ct
 
Unheated rubies are usually more expensive than heated stones of the same quality. Generally, Burma rubies have higher prices than rubies from other sources, such as Mozambique, Thailand, Sri Lanka etc.
Main origin
Myanmar, can command higher prices due to their reputation for producing high-quality stones. Rubies are also mined in Mozambique, Pakistan, Vietnam and others.
Ruby crystal on marble matrix from Mogok, Burma
Optical Effects of Phenomenal
Ruby can possess the phenomena of asterism, which is caused by inclusions of tiny bands of parallel rutile needles. To achieve the best results when working with star material, it is essential to make sure that the base of the cabochon is cut parallel to the inclusions. This will produce an even effect across the dome of the cabochon.
Imitation
Rubellite, red glass, red cubic zirconia, red spinels, red garnets
Red cubic zirconia
Red garnets
Rubellite
Quality factors
Color
It is the most significant factor affecting value. Look for a pure, vibrant red to slightly purplish red hue.
Clarity
Ruby inclusions are common and can affect the value and durability of the gem. The type, size, and location of the inclusions can determine their impact on the ruby’s appearance and value. 
Cut
The cut of the ruby should be precise and symmetrical to maximize its brilliance and reflect light in a desirable way. Commonly, rubies are fashioned as mixed cuts with brilliant-cut crowns and step-cut pavilions.

Carat weight
The size of the ruby is another factor that affects its value, with larger stones typically commanding a higher price. Fine-quality rubies over one carat are rare and their price increases significantly with size.
Care & Cleaning
Cleaning
  • Warm soapy water and a soft brush: safe and effective
  • Ultrasonic and steam cleaners: safe for untreated, heat-treated, and lattice diffusion treated rubies
  • Glass-filled or dyed rubies: only clean with a damp cloth
Care
  • Store separately from other gemstones
  • Stable under normal wearing conditions, except fracture-filled, and dyed rubies
  • Avoid exposure to chemicals, especially to glass-filled, and dyed rubies
History and Lore
Ruby has been treasured by various cultures, including ancient India where it was considered the “king of precious stones” and was believed to have mystical powers. In Burma, warriors believed rubies made them invincible in battle, while in medieval Europe, ruby was believed to bring health, wealth, wisdom, and success in love. Today, ruby remains a highly valued gemstone, prized for its rarity, hardness, and beauty, and continues to be associated with passion, love, and wealth.