Highly included, opaque rubies are nowhere near as rare as clear, transparent rubies or even clear, blue sapphires. The rarity of a ruby depends on the quality of the ruby crystals. This makes ruby jewelry ideal for frequent use and for pieces that are more susceptible to damage, like ruby rings and bracelets. Rubies do not react much to light, changes in temperature, and various chemicals. The last part of durability is about the stability of the stone, meaning how much things like light, temperatures changes, and chemicals affect it. This means rubies are very tough, and very resistant to breaking and chipping. Parting is similar to cleavage, but is usually less severe and less consistent in how it is oriented, located, etc. Ruby lacks cleavage planes (places where the stone likes to crack), though does have a tendency to part. Toughness, another part of stone durability, is separate from hardness and refers to a stone’s tendency to chip and break. Diamonds are the only natural stone harder than Corundum. Ruby is a difficult stone to scratch, sitting at a 9 on the Mohs scale (a hardness ranking that goes from 1 to 10) as a species of Corundum. Stone durability is ranked in three parts. Rubies from Sri Lanka (formerly Ceylon).Differences Between Diamonds and Corundum.Differences Between Rubies and Other Gems.Calculating the Cost of a Ruby Engagement Ring.
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