Jewelry & Gems
Overview
Jewelry valuation combines gemological assessment with design evaluation and maker identification. The value of a piece depends on both the intrinsic worth of materials and the premium commanded by prestigious makers and exceptional craftsmanship.
For diamonds, the 4Cs (cut, color, clarity, carat) establish baseline value, with GIA certification serving as the industry standard. Colored gemstones add complexity—origin determination (Burma ruby, Kashmir sapphire, Colombian emerald) can multiply values, while treatment disclosure significantly impacts pricing. Signed pieces from houses like Cartier, Van Cleef & Arpels, or Bulgari command substantial premiums.
Our methodology references auction results, the Rapaport diamond price list, and retail replacement costs. We apply appropriate discounts for resale market realities while recognizing premiums for exceptional stones, prestigious makers, and period designs (Art Deco, Victorian, etc.).
Valuation Factors
5 factorsValuation Type
Determines valuation approach: exact auction matches use sale price directly, while comparables require quality and condition adjustments.
Quality
Overall gemstone quality based on the 4Cs for diamonds (cut, color, clarity, carat) or equivalent grading for colored stones.
Condition
Physical state of the jewelry piece including metal wear, prong integrity, and any need for polishing or repair.
Brand
The maker or brand tier, with prestigious houses like Cartier, Van Cleef & Arpels, and Harry Winston commanding significant premiums.
Provenance
Documentation and ownership history including GIA certification, original receipts, and notable previous owners.