Case Analysis & Practical Application Flashcards

A customer presents a diamond with a GIA grading report showing SI1 clarity. A competing lab report on the same stone grades it VS2. How should you advise the customer?

Answer: Explain that different laboratories apply different grading standards; GIA's standards are widely considered the industry benchmark for consistency

Different grading labs apply different standards of strictness; the discrepancy is common, and GIA's grading standards are recognized as among the most rigorous and consistent in the industry.

A collector asks about an antique Old Mine Cut diamond and whether it should be recut to a modern round brilliant. What is the most professionally sound advice?

Answer: Recutting destroys the historical character and reduces carat weight; the collector must weigh rarity and provenance value against potential light performance gains

Recutting removes material and reduces carat weight while eliminating the stone's antique character, so the collector must weigh these losses against any potential improvement in light performance.

A retailer asks you to appraise a diamond for insurance replacement value. The GIA report lists retail replacement cost at $8,000, but the wholesale market value is $4,500. Which value should appear in the insurance appraisal?

Answer: The retail replacement value, because insurance appraisals reflect the cost to replace the item at retail

Insurance appraisals are based on retail replacement value—the cost to replace the item in the retail market—not wholesale or liquidation values.

You are asked to grade a parcel of melee diamonds (under 0.18 ct each) for a manufacturer. What is the standard approach compared to grading a single large diamond?

Answer: Melee is typically graded as a lot, assigning average or range grades for color and clarity to the entire parcel rather than individual stones

Melee parcels are graded as a lot with color and clarity expressed as ranges or averages, since individually grading hundreds of tiny stones is impractical and industry standards support lot grading.

A customer wants to verify that their diamond is not a conflict diamond. What documentation and certification system was established internationally to address this concern?

Answer: The Kimberley Process Certification Scheme (KPCS), which certifies rough diamonds as conflict-free at the government level

The Kimberley Process Certification Scheme is the international system requiring participating governments to certify that rough diamond exports are not funding rebel movements.

A jeweler submits an emerald-cut diamond for grading. The grader notes that clarity characteristics that would be SI1 in a round brilliant appear more prominent face-up in the emerald cut. What explains this?

Answer: The emerald cut's open, step-cut facet arrangement offers less brilliance to mask inclusions, making them more visible face-up

Step-cut diamonds like the emerald cut have broad, flat facets that do not break up light as brilliants do, so inclusions are less concealed and more apparent face-up at a given clarity grade.

A client's diamond tests positive as a natural diamond on a thermal conductivity tester but you suspect it may be a lab-grown diamond. What additional test would most definitively distinguish a natural diamond from a laboratory-grown diamond?

Answer: Advanced spectroscopic testing such as UV-Vis, FTIR, or DiamondView imaging, which reveals growth patterns specific to CVD or HPHT production

UV-Vis spectroscopy, FTIR, and DiamondView imaging reveal strain patterns, nitrogen aggregation states, and growth structures that distinguish natural diamonds from CVD- or HPHT-grown stones.