Since jewelry can appreciate in price, sometimes buying an expensive ... This 31.06-carat deep-blue diamond originated in India sometime during the 17th century before being bought by Laurence ...

With declining demand in Asia and competition from lab-grown alternatives, the gemstone appears to have lost much of its luster.

Best for tennis necklaces: Dorsey If you've ever admired the sparkling diamond necklaces worn by ... sapphires and plated sterling silver, the prices average around $200-$500.

When shopping for diamonds, there are a lot of factors to consider before making a purchase. Here are some expert-approved tips to follow when buying diamonds.