Mounted Diamond Evaluation Grading Report
Share |

Mounted Diamond Evaluation Grading Report

The AGS Laboratories (AGSL) Mounted Diamond Evaluation Report offers a grading analysis of diamonds that are already set in jewelry.

This report includes color and clarity grades insofar as the mounting permits, approximate total carat weight (as provided by the manufacturer), a description of the jewelry, and our verification of the mounting's stamp representing metal quality. In addition, our lab will confirm that the graded diamonds are natural and untreated. These reports are prepared by the same graders, with the same level of excellence that has consistently upheld consumer protection and satisfaction with our loose diamond grading.

Click the image below for a larger view.

Mounted Goods Report

Because jewelers have the opportunity to set diamonds in a way that presents them at their best, our grades will typically be reported in a two grade range (i.e. VS1-VS2  for clarity and I-J for color). Set diamonds often cannot be viewed without some limitations created by their settings. However, if the clarity of all stones in a mounted piece can be accurately graded as SI1, SI2, I1, I2, or I3, a single grade may be assessed for the clarity. The process we have developed for our Mounted Diamond Evaluation Report represents the grade for the finished jewelry as the customer will see it, worn on their hand, ear, neck or wrist.

The report is presented in a credit-card-size format that is easy to read and includes a photo representation of the graded jewelry. A tag will be attached to the jewelry to easily match inventory with the correct report. This tag will be printed with the AGSL report number and the client's item number. The report can be included with the jewelry sale, giving your customers the assurance and confidence represented by AGS Laboratories.


The AGS Laboratories' newest grading service, the Mounted Diamond Evaluation Report, offers a grading analysis of diamonds that are already set in jewelry. This opportunity allows consumers ranging from buyers of everyday wear jewelry to collectors of designer diamonds the access to AGSL grades supported by our ethical reputation and high standards. The new Mounted Diamond Evaluation Reports are prepared by the same graders, with the same level of excellence that has consistently upheld consumer protection and satisfaction with our loose diamond grading.

When a client requests the Mounted Diamond Evaluation Report, the client must be approved for the program. Within the parameters of the customer agreement, the client must provide accurate information about each jewelry item including:

  • approximate total carat weight
  • jewelry description
  • an identifying SKU or item number
  • all pieces must be stamped with a verifiable metal stamp

The client must also agree that the diamonds in the jewelry submitted:

  • are natural
  • are not diamond simulants (i.e., Cubic Zirconia, Moissanite)
  • are not synthetic diamonds
  • are not HPHT processed to improve color
  • are not fractured filled to improve clarity

AGSL will provide for the Mounted Diamond Evaluation Report:

  • color grade of the primary diamonds (split grade)
  • clarity grade of the primary diamonds (split grade or potential single grade in the I1, I2, or I3 grade categories)
  • confirmation of natural, untreated diamond through AGSL diamond testing protocol
  • confirmation of the metal stamp
  • sample Photo of piece of jewelry being graded
  • small melee will not be graded, but if present, must be included in the total carat weight

AGSL will reject submitted jewelry for the following reasons:

  • the primary diamonds are not confirmed as natural (tested in the AGSL lab)
  • the primary diamonds are laser treated including Pulse Laser Drilling or Laser Drilling
  • the primary diamonds are fracture filled
  • the manufacturer's hallmark is missing
  • the metal quality stamp is missing or unreadable¬†


The first step in AGS Laboratories' Mounted Goods Evaluation Report process is diamond testing. Using the same diamond testing equipment used for loose diamonds, the mounted diamonds are verified as natural. If the result of this test identifies the diamond as possibly treated, the jewelry will continue to more advanced testing. This further testing includes a gemological visual inspection with a microscope to determine treatments and the use of our advanced testing facility. The hallmark and metal stamps are also verified at this stage.

Next in the process, the jewelry continues to color grading. Our process for grading the color of a mounted diamond includes a face up assessment of the color grade within gemological tolerances as set by industry standards for loose diamonds. We use a set of mounted color master diamonds as comparators to assess these grades. Each piece will be assigned a color range within two grades that represents the minimum color for the primary diamonds to be graded. Lab research and extensive trials give us ultimate confidence in our process.

Following color grading, the clarity of the mounted diamonds is assessed. Using 10x magnification, the industry standard, we assess the clarity of the primary diamonds. It is important to note that the presence of the setting can affect the apparent face up clarity of the diamond. Prongs or setting types (bezel setting, etc.) can hide clarity characteristics. Characteristics that cannot be viewed in the grading environment may not influence the final grade. For this reason, the minimum clarity grade is assigned in a two grade range. Our ranges will be defined as the industry standard including:

  • VVS1-VVS2
  • VS1-VS2
  • SI1-SI2
  • I1-I2
  • I2-I3

In addition to these ranges AGSL may occasionally provide cross category split grades. This gives our lab the ability to provide a more precise assessment of clarity. These split grades will include:

  • VVS2-VS1
  • VS2-SI1
  • SI2-I1

For further precision, if the grade of all diamonds in a piece (both stones in a pair of solitaire earrings, for example) fall within the constraints of a single grade category, the piece may be assigned a single grade. These single grades are limited to:

  • SI1
  • SI2
  • I1
  • I2
  • I3

Because of the presence of settings, AGSL will not provide a grade of Flawless or Internally Flawless on the Mounted Diamond Evaluation Report.

The cut and finish of the mounted diamonds will not be assessed. AGSL's proprietary light performance cut grade system used for this assessment requires a 3D scan of loose diamonds. This scan is not possible for mounted diamonds in jewelry.

A small tag will be attached to the jewelry, printed with the AGSL report number and the client's item number. The tag matches the jewelry to the report thereby protecting the consumer against fraud, and giving the assurance and confidence represented by AGS Laboratories.


Mission Statement

The American Gem Society (AGS) is a nonprofit trade association of fine jewelry professionals dedicated to setting, maintaining and promoting the highest standards of ethical conduct and professional behavior through education, accreditation, recertification of its membership, gemological standards, and gemological research.

The Society is committed to providing educational products to inform and protect the consumer and to contributing to the betterment of the trade by creating industry standards to protect the jewelry-buying public and the fine jewelry industry as a whole.

AGS Laboratories, founded to support the AGS mission, is a nonprofit diamond grading laboratory with a mission of consumer protection. Adhering to the AGS Diamond Grading Standards, AGS Laboratories is dedicated to offering diamond grading reports that provide consistency and accuracy based on science.

American Gem Society