Best of Birthstones: The Most Decadent Diamonds

Billions of years in the making, diamonds are one of nature’s most wondrous and precious gifts. After being formed in the earth under immense pressure and heat, precise cutting and polishing bring out their incomparable beauty. While one could feast her eyes on beautiful diamonds at virtually any jewelry store, only the most perfect ones – think 100-plus carats and incredibly rare colors – reach stratospheric prices at auction. To pay tribute to April's birthstone, we take a look at 21 breathtaking diamonds that have come to Sotheby’s, including the CTF Pink Star, which set a world auction record for any diamond or jewel. –Stephanie Sporn

Magnificent Jewels
18 April | New York
Magnificent Jewels & Noble Jewels
15 May | Geneva