pink diamond that was sold in an auction selling pink diamond rings

Selling Diamonds with Sotheby's

Talk to a Diamond Specialist

Talk to a Diamond Specialist

Our diamond specialists are located in the below cities and travel frequently to view pieces of jewelry in person. Schedule an appointment or inquire about a visit by calling your closest Sotheby's office.

GENEVA: +41 22 531 0022
NEW YORK: +1 646 518 8553
LOS ANGELES: +1 310 274 0340
HONG KONG: +852 5803 0036
LONDON: +44 20 3868 8645
PARIS: +33 (0)1 85 14 96 56
MILAN: +39 02 29 500 201
TOKYO: +81 3 6770 2873
MADRID: +34 91 123 4218
MONTE CARLO: 8009 3827

Diamond Jewelry Consigned with Sotheby's

Frequently Asked Questions

  • How much is my diamond jewelry worth?
    Our diamond specialists will examine your diamond and provide a value based on provenance, quality, rarity, origin and the diamond's GIA certification. While each diamond is unique, every stone over one carat can be graded based on the Gemological Institute of America’s (GIA) global standards of diamond certification. Known as the ‘4Cs,’ these criteria are color, clarity, cut and carat weight. Each of these characteristics influences the appearance and value of the diamond.

    The color scale begins with the letter D. D, E, and F diamonds are near colorless and the most desirable, while G - Z diamonds increase respectively in yellow or brownish hue. Each letter grade has a clearly defined range of color appearance.

    Clarity refers to presence or absence of inclusions and blemishes, ranging from “internally flawless” (diamonds with no inclusions, which are quite rare) to “included” (diamonds with blemishes visible to the naked eye).

    The cut of a diamond is what gives the stone its radiance and sparkle . The GIA evaluates the skill with which the diamond was facetted, analyzing factors such as symmetry, proportion, and polish to determine how successfully the stone reflects light. The cut grading scale ranges from “Excellent” to “Poor.”

    A carat is the standard unit of measure for a diamond’s weight. One carat weighs 0.2 grams. The word “carat" originates from the Mediterranean “carob” seed, which was historically used to weigh stones.
  • Can I sell a loose colored diamond with Sotheby's?
    Sotheby's sells colored diamonds loose or as part of a ring, necklace, earring or other jewelry. Simply submit photographs of your colored diamond online to receive a complimentary estimate from our diamond specialists. Colored diamonds, or “fancy color” diamonds, are typically yellow, pink, blue, or green, and are extremely rare: roughly one colored diamond occurs in nature for every 10,000 gem-quality white diamonds. Colored diamonds are graded by their saturation, which ranges from “faint” to “fancy deep.” Diamonds that fall in the “fancy intense” and “fancy vivid” categories are among the most desirable for collectors, as they balance both intense color and eye-catching reflectivity.
  • How does Sotheby's determine how much my diamond is worth?
    Sotheby's specialists have many years of experience valuing and appraising diamonds. When the specialists determine an estimate, they consider general condition, carat weight, color, clarity, fluorescence, prices achieved at auction for similar pieces, age of the stone, and the history of ownership.
  • How can I sell my diamond engagement ring?
    When you are ready to sell a diamond engagement ring, simply submit photographs of the ring along with any information you have about it (when it was purchased, where it was purchased, any diamond certificate you have) to Sotheby's. Our auctions typically include a wide variety of colored or white diamond engagement rings for sale, and we would be happy to review your diamond ring for consignment.