GUILD Gem Laboratory has accumulated a valuable reputation in the industry with its stable and authoritative academic standards, especially the research on the origin and classification of emeralds and rubies has been widely recognized in the industry.
Taking the report of the certificate of routine jadeite inspection of the guild as an example, the contents of the certificate are explained:
Certificate left page
Certificate number? Report number? Each certificate has a unique number, which can be used to query e-certificates.
date of issue
Testing items? Articles? Describe the quantity and appearance of the detected items (bare stones, rings, necklaces, etc.). )
Species category? The family to which the gem belongs.
What kind of gems? Variety? Is the gem natural or synthetic? There will be the word "natural" in front of natural gemstones and the word "synthetic" in front of synthetic gemstones.
Weight. The weight is in carat, 1 carat = 0.2g.. For jewelry, add * after ct, and note "* indicated by hallmark/ customer" in the remarks.
Size? Size? If the mosaic size cannot be accurately measured, an approximate value will be added.
Cut? Cut? Bright surface (bright surface cutting), step (step cutting), improved bright surface (improved bright surface cutting), convex circle (curved surface cutting), other (other) ***5 kinds.
Shape. Shape? Oval, Cushion, circle, Pear (water drop), Marquise (horse eye), Heart, Square (square), Kite, Octagonal (octagonal), Other (Other) * * * 6544.
Comments? Explain whether the GEM has been optimized.
Certificate right page
report number
Sample photo
Name and place of origin of special enterprise, etc.
anti-counterfeit label
Query QR code
Among them, the commercial name Verdant Green is the highest rating of jadeite color given by GUILD Laboratory. When the emerald reaches the emerald level, it is classified as bright green * in the emerald report, and the product name: emerald (product name: Wharton Green) is marked at the bottom of the photo. Wharton Green has further explanation in the attached page of the report.
At present, the emeralds produced by guilds are: Colombia, Zambia, Brazil, Afghanistan, Pakistan, Ethiopia, India and so on.
Small production areas that can be judged: Chivor) (Chivor, Gachala) (Gogara, Afghanistan, Pakistan, Swat. And attach an attached page for further introduction.
For the emerald with optimized cleanliness, the guild report named it "natural emerald" in its conclusion, and indicated in the remarks column that the degree of cleanliness optimization is divided into six grades:
-No..
-The smallest doesn't matter
-minor.
-Mild to moderate
-Medium-sized modem
-Serious.