【中文版】

钻石底尖为什么要切掉？这主要是出于两个原因。

首先，钻石的底尖是钻石的薄弱点，它承受着整个钻石的重量。如果底尖受到损伤，钻石可能会出现裂纹，甚至碎裂。为了保护钻石，避免底尖受到外力的影响，切掉底尖可以有效地提高钻石的耐用性。

其次，切掉底尖可以消除钻石的底尖面，使钻石看起来更加亮丽。钻石的底尖面可能会让钻石看起来暗淡无光，影响其美观度。通过切掉底尖，可以将钻石的底部与桌面更加紧密地结合在一起，从而增强钻石的光泽和亮度。

总之，切掉钻石的底尖是为了提高钻石的耐用性和美观度。虽然这可能会降低钻石的价值，但是对于想要保护钻石并使其更加闪亮的消费者来说，这是一个非常值得考虑的选择。

【英文版】

Why is the diamond bottom tip cut off? This is mainly due to two reasons.

Firstly, the bottom tip of the diamond is its weak point, which bears the weight of the entire diamond. If the bottom tip is damaged, the diamond may appear cracked or even broken. To protect the diamond and avoid the impact of external forces on the bottom tip, cutting off the bottom tip can effectively improve the durability of the diamond.

Secondly, cutting off the bottom tip can eliminate the bottom tip surface of the diamond, making it look more beautiful. The bottom tip surface of the diamond may make it look dim and unattractive, affecting its aesthetics. By cutting off the bottom tip, the bottom of the diamond can be more closely integrated with the tabletop, enhancing its luster and brightness.

In summary, cutting off the bottom tip of the diamond is to improve its durability and aesthetics. Although this may reduce the value of the diamond, it is a very worthwhile choice for consumers who want to protect the diamond and make it more sparkling.