Education
Colored Bands in CVD-Grown Diamond
Srushti Tanti and Raju Jain
Figure 1. A growth remnant appeared as a color band (arrow) in a 3.14 ct CVD-grown diamond. Photomicrograph by Raju Jain; field of view ~11.75 mm.
Figure 2. A: Hazy parallel lines (indicated by arrows) resembling whitish internal graining. Photomicrograph by Raju Jain; field of view ~6.31 mm. DiamondView imaging of the pavilion facets showed blue growth layers in green fluorescence (B), as well as strong green phosphorescence (C). Images by Suraj Maurya.
The Surat laboratory recently examined a 3.14 ct F-color oval brilliant diamond grown by chemical vapor deposition (CVD). The diamond featured a single dark brown band measuring ~2.2 mm in length that resembled graining in natural diamond (figure 1). The band was visible under the microscope as well as with a 10× loupe. The clarity grade was VVS2 based on this colored band, which was visible through multiple bezels and affected the transparency at that location. Through the pavilion, parallel whitish bands were also observed (figure 2A).
Figure 3. False-color PL map of the SiV– defect at 736.6/736.9 nm using 633 nm laser excitation, normalized to the diamond Raman area on the pavilion. The dashed line indicates the approximate outline of the diamond.
The subtle banding seen in this diamond differed from a cloud of graphite inclusions at a growth interface previously reported in a CVD-grown diamond (Summer 2023 Lab Notes, pp. 213–214). The fluorescence image collected by the DiamondView revealed a layered growth structure that did not coincide with the color banding, indicating a start-stop cycling growth process typical of CVD synthesis (figure 2B). Deep UV fluorescence with green and blue coloration as well as strong green phosphorescence seen in the DiamondView image (figure 2C) indicated high-pressure, high-temperature treatment. The SiV– defect at 736.6 and 736.9 nm, a common feature of CVD laboratory-grown diamond and only rarely seen in natural diamond, was observed in photoluminescence (PL) spectra using 457, 514, and 633 nm laser excitation. PL mapping (figure 3) revealed that the concentration of SiV– was higher near the culet of the pavilion and dramatically lower near the table.
GIA has documented growth remnants in thousands of CVD-grown diamonds. But with a multitude of manufacturers, recipes, and treatments, a wide variety of clarity characteristics are encountered, including the unusual color band observed here.
Authors: Srushti Tanti is an analytics technician, and Raju Jain is a training specialist, at GIA in Surat, India.
This article was contributed by GIA® (Gemological Institute of America®)
GIA.edu | GIAindia.in
Education
The New-Age Jewellery Professional: Why Tech Education for Jewellery Industry is the Biggest Growth Driver
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The jewellery industry is no longer defined by craftsmanship alone. Today, it sits at the intersection of design, technology, sustainability, finance, branding, and global trade. As consumer expectations evolve and competition intensifies, structured education and continuous skill development are emerging as the most powerful growth catalysts for the sector.
For a dynamic industry like India’s jewellery market, education is not optional — it is strategic.
From Karigar to Knowledge Professional
For decades, the backbone of the industry has been generational craftsmanship. While this legacy remains invaluable, modern jewellery businesses now demand professionals who understand:
- Gemology and diamond grading
- CAD and 3D jewellery design
- Retail management and consumer psychology
- Digital marketing and brand storytelling
- International trade compliance and tariffs
- ESG and sustainability frameworks
Institutions such as the Gemological Institute of America and the Indian Institute of Gems and Jewellery have played a key role in formalising education pathways, helping transform traditional artisans and retailers into globally competitive professionals.
Trend Watch: Rise of Tech-Integrated Learning
One of the strongest education trends shaping the industry is technology integration.
- CAD & CAM Training: Digital prototyping reduces costs and speeds up product development cycles.
- AI in Retail Forecasting: Data-driven inventory planning is replacing intuition-based buying.
- Blockchain Awareness: Traceability in diamonds and coloured gemstones is becoming a compliance requirement rather than a luxury.
- Lab-Grown Diamond Expertise: As lab-grown diamonds gain market share, understanding grading, pricing dynamics, and consumer positioning has become critical.
Educational programs now increasingly blend online modules with hands-on workshops, enabling faster upskilling for working professionals.
The Bridal Economy & Consumer Education
India’s bridal jewellery segment continues to drive demand, but the modern bride is informed and research-oriented. She compares:
- Natural vs lab-grown diamonds
- Hallmarking standards
- Ethical sourcing claims
- Design originality
Retailers who invest in staff education see higher trust conversion rates. Well-trained sales professionals are no longer “salespeople” — they are consultants guiding life-defining purchases.
Financial Literacy in Jewellery
Another emerging area is financial education within the industry itself. With gold functioning as both adornment and asset, professionals must understand:
- Gold monetisation frameworks
- Hedging strategies
- Commodity price cycles
- Working capital management
Structured knowledge helps businesses move from being inventory-heavy traders to strategically managed enterprises.
Sustainability & Responsible Sourcing
Global buyers increasingly demand proof of ethical sourcing and environmental compliance. Education around responsible mining practices, supply-chain transparency, and ESG reporting is becoming central to export competitiveness.
Industry bodies such as the Gem & Jewellery Export Promotion Council regularly conduct seminars and workshops to align Indian exporters with evolving global standards.
The Future: Hybrid Skills Will Win
The next generation jewellery professional will not be defined by a single skill. The future belongs to those who combine:
- Design sensibility
- Technical expertise
- Business acumen
- Digital fluency
- Ethical awareness
For a sector contributing significantly to India’s exports and employment, education is the bridge between heritage and high growth.
Knowledge is the new luxury. As the jewellery industry transitions into a more organised, tech-enabled, and globally integrated ecosystem, continuous learning will determine who leads and who lags. The sparkle of the future will not just come from diamonds — it will come from informed minds shaping the industry.
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