Matura diamonds

例句：

1. 1. The matura diamonds are the most valuable gemstones in the world.
   玛鲁达钻石是世界上最珍贵的宝石。
2. 2. She wore a matura diamond ring on her left hand.
   她左手戴着一枚玛鲁达钻石戒指。
3. 3. The matura diamond was discovered in Brazil, and it has become a symbol of wealth and power.
   玛鲁达钻石在巴西被发现，它已成为财富和权力的象征。