The rise of lab-grown diamonds has increased the size you can get for the money, but the newly engaged take offense at inquiries: “It’s rude to ask.” ...

Diamonds, rare colored gems and signed jewels from important private collections fueled Sotheby’s High Jewelry auction in New York on Friday. The top lot of the sale, as expected based on pre-sale ...

“We are privileged to have presented such a wonderful offering in the New York Jewels sale, led by the spectacular collection from a distinguished European family featuring two magnificent diamonds,” ...