GIL 4C+5G Grading System for Lab-Grown Fancy Color Diamonds
Table of Contents
Lab-grown fancy color diamond market has long been trapped in confusing industry standards. Messy color naming rules and ambiguous grading criteria have made market pricing completely disordered.
The launch of the GIL 4C+5G grading system is building a unified professional language system for the fast-growing lab-grown fancy color diamonds industry.
This standard divides lab-grown fancy color diamonds into 4 major color families and 16 sub-color families, matched with five-level G1–G5 lightness grading. The GIL 4C+5G grading system is professional, clear and highly suitable for global market promotion.
More importantly, the GIL 4C+5G grading system has built essential standardized infrastructure for the entire industrial chain. Sellers gain a unified promotion standard, consumers get transparent purchasing references, and the whole industry steps out of vague disorder into quality-driven order.
Standardization is the inevitable way for the lab-grown fancy color diamonds market to mature. Industry standards build norms, and professionalism wins consumer trust. The GIL 4C+5G grading system strongly fuels the high-quality development of the global cultivated diamond sector.
With the booming development of the global lab-grown diamond industry, standardization, professionalism and systematization have become core driving forces. To promote sound development of lab-grown fancy color diamonds, unify color grading terminology, and improve appraisal credibility and shopping transparency, GIL Global Gem Laboratory officially released the GIL 4C+5G grading system for the entire jewelry industry.
Tailored exclusively for lab-grown fancy color diamonds, this new grading standard is scientific, rigorous, easy to understand and globally applicable. It marks a milestone: lab-grown fancy color diamonds have entered an era of precise grading instead of vague description, providing unified professional support for market trade, brand product selection, public cognition and certificate marking.
Core of GIL 4C+5G Grading System: 4C for Color Family, 5G for Color Depth
The GIL 4C+5G grading system consists of two core modules: 4C color classification system and 5G lightness grading system. It features logical structure, clear hierarchy and easy memorization for both merchants and consumers.
4C Color Classification: 4 Major Color Families and 16 Sub-Color Families
Based on the most mainstream, stable and widely recognized color characteristics of lab-grown fancy color diamonds, the GIL 4C+5G grading system defines four core color families: Pink, Yellow, Blue and Green.
Each main color family is further divided into four sub-colors by tone, overtone and visual style, adopting standardized English and commercial naming. It maintains professional accuracy while fitting global marketing and helping international customers understand quickly.
Pink Family
As one of the most popular tones in lab-grown fancy color diamonds, pink presents romantic and premium temperament, including four sub-colors:
- Sweet Pink: Warm undertone pink with soft and gentle body color
- Angel Pink: Pale pastel pink with fresh and bright visual effect
- Rose Pink: Magenta pink with balanced saturation
- Sun Pink: Orange undertone pink with vivid and lively shade
Yellow Family
Yellow is bright, noble and the most widely accepted tone in the market, containing four sub-colors:
- Shine Yellow: Clear bright yellow with refreshing tone
- Canary Yellow: Intense vivid yellow with strong color concentration
- Royal Yellow: Deep classic yellow with steady luxurious texture
- Golden Yellow: Gold-toned yellow with full and rich color layering
Blue Family
Blue is calm, profound and rare, representing premium taste, with four sub-colors:
- Sky Blue: Light transparent blue with fresh visual sense
- Ocean Blue: Soft sea tone blue with quiet and elegant style
- Royal Blue: Rich deep blue with noble temperament
- Modern Blue: Cool tone blue with minimalist high-end style
Green Family
Green is fresh, natural and trendy, full of vitality, divided into four sub-colors:
- Vital Green: Bright vivid green with energetic tone
- Olive Green: Olive undertone green with soft and steady shade
- Mint Green: Fresh mint tone green with elegant texture
- Forest Green: Deep dense green with strong color depth
The four major color families and sixteen sub-colors cover almost all mainstream colors of lab-grown fancy color diamonds, achieving one diamond, one precise classification under the GIL 4C+5G grading system.
5G Lightness Grading: Scientific Standard to Judge Color Depth
After confirming the sub-color category, the GIL 4C+5G grading system classifies all colors into G1 to G5 five grades according to lightness, saturation and visual depth.
G1 is the lightest level while G5 represents the highest color intensity. Graded from light to dark, G1–G5 allows anyone to quickly judge the color depth and value of lab-grown fancy color diamonds without professional gem knowledge.
Industry Value of GIL 4C+5G Grading System
Unified Industry Language with Scientific Standards
Formulated following official diamond grading specifications, the GIL 4C+5G grading system owns standardized testing procedures, scientific judgment basis and stable repeatable results. It realizes one standard covering all categories and unifies global industry terminology for lab-grown fancy color diamonds.
Simple Expression Reduces Global Communication Cost
Without complicated professional jargon, the GIL 4C+5G grading system uses easy-to-understand naming and visual grading rules. It greatly improves efficiency in live sales, product introduction and cross-border customer communication for lab-grown fancy color diamonds.
Standardized Certificate Improves Consumer Trust
All GIL appraisal certificates for lab-grown fancy color diamonds are uniformly marked with sub-color name and 5G grade. Clear and standardized labeling lets global buyers shop transparently and purchase with confidence.
Boost Standardized and Healthy Market Development
The GIL 4C+5G grading system provides reliable reference for pricing strategy, product selection and quality control of lab-grown fancy color diamonds, guiding the industry to shift from disorderly vague trading to standardized quality operation.
GIL’s Mission: Drive High-Quality Development of Lab-Grown Diamond Industry
From colorless diamonds to fancy color diamonds, from gem appraisal to industry standard setting, GIL Global Gem Laboratory always adheres to technology, safety and high efficiency. It keeps optimizing testing technology and improving grading rules to promote the internationalization and standardization of China’s lab-grown diamond industry.
The release of the GIL 4C+5G grading system for lab-grown fancy color diamonds demonstrates GIL’s technical strength, as well as its responsibility to the industry, market and global consumers.
In the future, GIL will continue to take technology as the foundation, standards as the guidance and service as the core. By upgrading testing equipment, optimizing appraisal processes and improving service quality, GIL will provide professional, authoritative and reliable gemstone certification solutions for the global jewelry industry.
Note:
The images in this article are for reference only; the actual product may vary.
About GIL
GIL Global Gem Laboratory is an internationally authoritative gem appraisal and grading institution. Committed to professional diamond and colored gemstone testing, GIL has launched the innovative GIL 4C+5G grading system specially designed for lab-grown fancy color diamonds. With standardized identification technology and rigorous grading standards, GIL keeps empowering the global lab-grown diamond industry with credibility, transparency and professional industry norms.
GIL (Gem International Laboratories) Official Website http://www.gil-usa.com/
