One should buy stones as per one’s personality. The jewelry shouldn’t overpower it. “You should not buy it just because someone else is wearing it. Today, it’s all about transparency and value,” says Varuna. A 5 carat diamond may cost up to Rs40 lakhs. However, a 5 carat Colombian emerald will be very rare and can be priceless. Here’s the low-down on some of the most expensive stones .