Diamond grading reports and what they actually do to a jewelry loan

For any jewelry piece anchored by a center stone over one carat, the grading report is the single biggest input to the loan appraisal. Two diamonds with the same color and clarity grade can appraise at meaningfully different loan offers based purely on which lab issued the report, and how recently.

The lab hierarchy

GIA is the reference standard. Lender appraisers will price a GIA-graded stone at full market because the grading is consistent and globally accepted. AGS reports are treated equivalently in most markets. IGI reports are accepted but typically discounted 5-10% on color and clarity grading because the lab is known to grade more loosely than GIA in practice. GCAL is accepted, particularly for cut-grade specifics. Reports from in-house dealer labs or non-major labs are usually re-priced based on the appraiser's own physical examination.

How re-grading changes the loan

If your stone has an old IGI report from 2015, the lender appraiser will often quote two loan numbers — one based on the existing report, and one assuming a fresh GIA re-grade comes back at the same color and clarity. The second number can be 10-20% higher. For larger stones, the cost of the re-grade ($200-$500) is usually worth absorbing before the loan closes.

Setting and brand

Stone value is the floor. Setting and brand can lift it. A signed Cartier, Van Cleef, Tiffany, Harry Winston, Bulgari, or Graff piece usually appraises 30-80% above the diamond-only value because the brand commands a secondary-market premium. Unsigned settings of equivalent metal weight are appraised closer to melt-plus-stone value.

LoanAgainstJewelry coordinates the grading-report review and stone re-grade if needed before the in-person appraisal, so the offer is anchored to the strongest report the stone can hold.

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