Question 1

What are the 4 Cs and how do they determine value?

Accepted Answer

The 4 Cs (GIA standard) are: Carat (weight—one carat = 200mg; price per carat rises exponentially for fine diamonds), Clarity (absence of inclusions visible under 10x loupe; FL/IF/VVS/VS/SI/I grades), Color (absence of yellow/brown tint in diamonds; D-Z scale; fancy colors are graded separately), and Cut (quality of faceting geometry, affecting light return and brilliance). For a 1.5-carat diamond: an H/VS1/Excellent Cut might appraise at $5,500; that same carat in I/SI2/Fair Cut might be $2,800. Color, clarity, and cut are subjective calls (different labs may grade a diamond SI1 vs VS2), so reputation and consistent standards matter enormously.

Question 2

How do I tell a lab-created diamond from a natural diamond?

Accepted Answer

With loupe alone you cannot: lab diamonds are chemically identical. Tools required: thermal conductivity tester (some lab stones conduct heat differently), electrical conductivity meter, or UV and X-ray fluorescence analysis (different fluorescence patterns). A 10x loupe reveals growth patterns—lab stones show distinctive 'clouds' or striations; natural diamonds show 'trigons' (triangular etch pits). The real answer: send it to GIA or AGS for certification. Market reality: lab diamonds are 40-60% cheaper and identical in appearance, so many clients are shifting to lab-created for engagement rings. As a setter, you must disclose origin on any appraisal.

Question 3

What is the difference between bezel, prong, and pave setting?

Accepted Answer

Bezel: a rim of metal surrounds the stone's edge, securing it invisibly. Pros—durable, protects the girdle, custom-fit per stone. Cons—reduces visible surface area, requires precise measurement. Prong: thin metal teeth grip the crown facets, usually 4, 6, or 8 points. Pros—maximizes light return and visible stone. Cons—prone to snagging (loose prong catches clothing), requires re-tightening. Pave: a surface of micro-stones (0.5–2mm) covers a metal section, creating an illusion of solid gems. Pros—dramatic sparkle, very valuable look. Cons—requires specialized tools, labor-intensive, prone to stone loss over decades. Choose based on stone size, durability need, and aesthetics.

Question 4

How do I measure a stone for setting without damaging it?

Accepted Answer

Use a digital caliper (non-contact if possible) to measure width and depth. For faceted stones, measure across the table (flat top) and the depth from table to culet (point). Compare to master stones of known size and cut. Never force a stone into a setting—if it does not slide in smoothly, the setting is too tight and you risk fracture. For loose stones, place a piece of white tracing paper under the stone and outline it with a pencil; you can then measure the outline or compare to templates. Always insure a stone in hand: if you crack it under your care, you are liable.

Question 5

What training and certification do I need for independent appraisal work?

Accepted Answer

Most appraisals require GIA Graduate Gemologist (GG) credential (several years of study and lab work) plus professional liability insurance ($500–$2,000 annually) and membership in NAJA or AAA. Many states do not legally require appraisal certification, but high-value estate and insurance work demands it—clients and insurers will not accept an unverified appraisal. The GG teaches gem identification, microscopy, spectroscopy, and valuation methodology. Plan 1-2 years of part-time study alongside apprentice work.

Question 6

How do I handle a client's heirloom stone that may be fragile or treated?

Accepted Answer

Always ask: age, origin story, and any prior repairs. Many vintage stones (especially colored gems) are heat-treated, irradiated, or have fracture-filled clarity enhancements—these are stable but cannot be re-exposed to high heat (soldering torch). If you must re-set, use laser welding or adhesive-and-clamp methods that avoid direct flame. Under loupe, look for haziness or cloudiness, which may signal a filled fracture. Never assume; ask a senior appraiser if unsure. Send critical stones to GIA for full documentation: a heat-treated sapphire certified by GIA commands trust and holds value better.

Question 7

What is the role of light source in grading color and clarity?

Accepted Answer

Color and clarity grading is performed under standardized lighting: 5000K daylight-equivalent (D65 light source). A stone graded as 'colorless' under D65 may appear yellowish under incandescent light. High-clarity stones graded under proper lighting show no inclusions to the loupe; under poor lighting (phone flashlight, sunny window) you may miss or exaggerate inclusions. For client-facing work, always present the stone under proper lighting and explain that appearance varies with light. Insurance appraisals must cite the lighting standard used. Invest in a professional grading light booth (DiamondLite, GemsOro) or work at a reputable lab with controlled lighting.

ภูมิภาค	เจ้าหน้าที่จูเนียร์	ระดับกลาง	เจ้าหน้าที่อาวุโส
USA	$25k	$48k	$72k
UK	£18k	£35k	£55k
EU	€20k	€38k	€60k
CANADA	C$29k	C$55k	C$80k

ภูมิภาค	เจ้าหน้าที่จูเนียร์	ระดับกลาง	เจ้าหน้าที่อาวุโส
USA	$25k	$48k	$72k
UK	£18k	£35k	£55k
EU	€20k	€38k	€60k
CANADA	C$29k	C$55k	C$80k

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