Ruby

Ruby, a gem which in value and hardness ranks next to the diamond; is dichroic, of greater specific gravity than any other gem, and belongs to the hexagonal system of crystals; is a pellucid, ruddy-tinted stone, and, like the sapphire, a variety of corundum, also found (but rarely) in violet, pink, and purple tints; the finest specimens come from Upper Burmah; these are the true Oriental rubies, and when above 5 carats exceed in value, weight for weight, diamonds; the Spinel ruby is the commoner jeweller's stone; is of much less value, specific gravity and hardness, non-dichroic, and forms a cubical crystal.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Rubrics * Rückert, Friedrich
Royal Society of Edinburgh, The
Royal Society of London
Royan
Royer-Collard, Pierre Paul
Royton
Ruabon
Rubens, Peter Paul
Rubicon
Rubinstein, Anton
Rubrics
Ruby
Rückert, Friedrich
Ruddiman, Thomas
Rudolf I.
Rudolf II.
Rudolf Lake
Rudra
Rugby
Ruge, Arnold
Rügen
Ruhr

Nearby

Ruby in Brewer’s Dictionary of Phrase & Fable

Links here from Chalmers

Benbow, John
Evelyn, John
Foote, Samuel