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Pearls Certificate SGL Report
INSPECTION, CARE, AND HANDLING PROCEDURES
SGL applies the same item identification and tracking procedures to all pearls, as it does for colored stones and diamonds. Each item is assigned a bar-coded label with a unique internal identification number that is used to track it throughout the process. And at every step, special inspection, care, and handling procedures ensure items are managed with the utmost care.
WEIGHTS AND MEASURES
This is the first stop for any item submitted for pearl services. Pearls are counted by hand and then weighed with an electronic micro-balance that captures the weight in grams (mounted or strung), carats (loose), or carats and grains (loose natural). Pearls are measured using special digital calipers.
IDENTIFICATION AND CLASSIFICATION
Items are then transferred to the Identification Inventory Control department for distribution to trained and experienced gemologists for servicing. Once an item is received by an initial gemologist, its recorded weight and measurements are verified. The gemologist identifies pearl types, mollusks and any detectable treatments using the standard gemological testing and advanced testing equipment, including real-time x-radiography, UV-Vis reflectance spectroscopy and XRF. Real-time microradiography equipment is used to measure the nacre thickness of bead-cultured pearls if the nacre appears thin or when requested by the client.
The gemologist determines color and classifies the other fators under a controlled viewing and lighting environment, using a comprehensive set of pearl masters. The pearl master sets include a hue circle and various color grids to determine color, and type-specific master sets of strands to classify luster, surface and matching.
After that, the item is transferred to a second gemologist, who independently performs all necessary observations and testing. Depending on the identity and nature, the item may be examined by additional gemologists and research specialists.
SGL 11 pearl value factors
- mollusk
- shape
- size
- body color
- overtone
- surface
- luster
- kind
- origin
- water
- nacre
Get True Value For Your Pearl!
SGL Labs diamond evaluation process is recognized throughout the industry and the world for its absolute precision. Diamonds are examined by four different gemologists, using the most advanced technology available.
Quality that inspires confidence
The integrity of the SGL grading process is absolute. Our diamond lab applies an uncompromising operating code which it supports by using some of the most new technology and qualified graders.
Online & Reliability; Data
The grading report is available on our website and is kept on the website for 15 years for data availability and certificate reliability check. Check your report on the SGL website.
Anonymity and Objectivity
The objectivity of the grading results is guaranteed by means of a double coding system: one set of codes is given to the owner, while the other follows the diamond in the lab. Strict anonymity guarantees strict objectivity.
FAQ
It is essential for each diamond proprietor to know the credentials of their diamond in order to obtain confidence and assurance of the integrity of what they have acquired. An SGL Diamond or Gemstone Certificate is a statement issued by one of our independent gemological laboratories documenting the characteristics of the stone as determined by our experienced diamond graders at the time of evaluation.
Hearts and Arrows Diamonds are precision cut variations of the traditional 57 faceted round brilliant cut. They are cut to “ideal proportions” with superior optical symmetry and a specific faceting pattern. When all these factors are in harmony the result is a repeatable, near perfect pattern of eight symmetrical arrows in the face up position and eight symmetrical hearts when viewed in the table down position.
As you research diamonds, you may have seen information about lab created diamonds versus naturally formed diamonds. Some people may refer to lab created diamonds as “fake diamonds”, imitations or simulants, but this is incorrect. Lab created diamonds share the same or similar chemical and physical properties as a natural diamond produced by the geological processes of Mother Nature. However, because of the contrasting conditions of natural and lab grown formation, lab grown diamonds display several features which allow them to be gemologically distinguished from natural diamonds. On the other hand, cubic zirconia and moissanite—which can look like diamonds—have very different chemical and physical properties and are known as simulant diamonds.
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