THE WORD “diamond” is derived from the Greek ward _adamas, meaning “‘unconquerable,’* | sug-' gesting (he. eternity, of. love--and evoking the... popular.” advertising slogan, ‘Diamonds are forever.*” ~ At one time, :only kings and -‘no- bles were priviteged to wear. dia- monds. Rulers of ancient” india, who believed them to have the: power lo make: them ‘invincible, ‘wore dia- monds-as a {aiisman: to’ ward off evil. In the Middle Ages, diamonds were worn inio battle as a symbol of courage. > it wasn’t: patil the 15th century, though. that. it became’ custom to present the ‘sparkling gem as an engagement ring; Mary of Burgun- dy was the first. to