Services
Quality Analysis Report
The Quality Analysis Report is a certificate attesting to the quality of a diamond or gemstone. A signed document listing the results of a complete analysis including weight, color, clarity, plot, measurements, proportions, finish and fluorescence. This report will list any treatments or enhancements that may have been performed on the gem.
Carte Blu
A grading report for mounted jewelry and gemstones that features a high quality image on the report. The Carte Blu consists of a complete analysis that includes weight, color, clarity, measurements and assessment of finish. At the request of the customer, this report may include an appraisal value on an article of jewelry or a finished gemstone.
For price inquiries, consult the Price List page.
Breakout Gemstone Sorting
PGS Lab is one of the few firms that is able to sort mass quantities of loose gemstones. The program is specifically designed for our pawnbroker clientele base. We charge per pound for the sort and then issue certificates on any good quality, valuable gemstones in the lot.
Other
Customizable services upon request including: escrow services, expert jewelry counsel, damage reports, Sarine reports, Type IIa diamond evaluation and HPHT candidacy assessment, and much more.
A Note on Standards and Terminology

Appraisals
An appraisal of a gemstone or an item of jewelry involves two operations: evaluation and valuation. Evaluation is determining the quality of the gemstone and of the mounting; valuation is then assigning a monetary value to these items, based upon their quality assessment. There are various levels and markets to consider in assigning appraisal values, depending upon the nature of the appraisal assignment. The most common type of valuation report is the insurance replacement cost appraisal. This monetary value is used primarily as the basis to determine the premium for an insurance policy on a newly acquired piece of jewelry.

Carat Weight
The carat weight of a stone is taken from a precision calibrated gemological scale. The weight is measured to the nearest thousandth and rounded up only when the digit in the thousandth column is a nine.
​Clarity
All clarity grades are determined using a corrected, ten-power (10X) loupe.

Color
All diamonds are color graded by two gemologists against master comparison stones. These are a set of precisely graded diamonds that are standardized for size, make and fluorescence. The color of fancy color stones are determined by comparison to Munsell color order standards, as presented in the book The World of Color.

Comments
Comments are listed if there are any features to note about that particular diamond or color stone. This will include any treatments or enhancements to the stone and may also pertain to the make and finish of a stone.

Cut Grade
Listed on an Excellent, Very Good, Good, Fair and Poor scale - the proportions are dicated by the ideal parameters of the Tolkowsky system.

Plot Diagram
The plot diagram is a 2-D representation of a diamond's internal and external identifying characteristics and inclusions.
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Loose Gemstone Reports
After identification of an unknown gemstone, we offer loose certification on that item. The report is done on a Carte Blu and offers some customizable features based on the identity of the gemstone.