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The Science Behind Sparkle: How Lab-Grown Diamonds Are Created

A New Era of Diamond Creation

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In recent years, lab-grown diamonds have captured the attention of jewellers, consumers, and investors alike. Beyond their beauty, what makes these gems truly fascinating is the science behind their creation. Unlike imitation stones, lab-grown diamonds share the same physical, chemical, and optical properties as natural diamonds — the only difference lies in their origin.

At the heart of this innovation are two cutting-edge processes: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD). These methods recreate the intense conditions under which natural diamonds form deep within the Earth, allowing scientists to produce genuine diamonds in a controlled laboratory environment.

HPHT: Diamonds Born Under Extreme Conditions

The High Pressure High Temperature (HPHT) method mimics the natural diamond-forming process that occurs about 150 kilometers below the Earth’s surface.

  1. Starting Point – The Seed:
    A small diamond seed, usually a thin slice of an existing diamond, is placed inside a carbon-rich chamber.
  2. Simulating Nature – Pressure and Heat:
    The seed is exposed to extreme conditions — pressures of about 5–6 GPa (equivalent to the pressure at the Earth’s mantle) and temperatures of 1,400–1,600°C.
  3. Crystal Growth:
    Under these conditions, the carbon source melts and crystallizes around the diamond seed, forming a larger crystal over several weeks.

The result is a high-quality diamond crystal that is virtually indistinguishable from its natural counterpart. HPHT diamonds often exhibit exceptional clarity and can be produced in a range of sizes and colors, including colorless, yellow, and blue varieties.

CVD: Diamonds Grown in a Plasma Cloud

The Chemical Vapor Deposition (CVD) process is a more recent innovation that uses advanced plasma technology to grow diamonds atom by atom.

  1. Preparing the Chamber:
    A thin diamond seed is placed inside a vacuum chamber filled with carbon-rich gases, typically methane and hydrogen.
  2. Creating Plasma:
    The gases are energized using microwaves or lasers, forming a plasma cloud that breaks down the molecular bonds of the gases.
  3. Diamond Formation:
    Carbon atoms released from the plasma settle onto the seed layer, crystallizing into pure diamond over the course of several weeks.

The CVD method allows for greater control over purity, color, and size, making it ideal for high-end jewellery applications. It also produces diamonds that are free from many of the inclusions typically found in natural stones.

Technology Meets Sustainability

Both HPHT and CVD processes are transforming the jewellery industry not only through technology but also through sustainability. Lab-grown diamonds require no mining, dramatically reducing environmental impact. Many manufacturers are also transitioning to renewable energy sources to power their production facilities, making these diamonds even more eco-conscious.

Furthermore, traceability is a defining advantage. Every lab-grown diamond can be tracked from its creation, offering complete transparency — a growing priority among modern consumers seeking ethical luxury.

Crafting the Future of Jewellery

As consumer awareness grows, lab-grown diamonds are redefining what it means to own something precious. With their scientific precision, sustainable creation, and stunning beauty, they represent the perfect harmony between innovation and artistry.

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Education

IIG Demonstrates the Future of Industry-Ready Education at Jaipur Jewellery Show 2025

Through immersive industry exposure, factory visits and live design showcases, IIG redefined professional learning beyond the classroom at JJS 2025.

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As the Jaipur Jewellery Show (JJS) concluded what is traditionally the final major trade exhibition of the year, the International Institute of Gemology (IIG) used the moment to underline a larger shift underway in professional education, one where classroom learning is no longer sufficient without deep, structured industry immersion.

For IIG students, JJS was not an event to attend but a system to decode. Through its Student Delegation Activity, the institute designed a multi-layered learning experience that combined trade exposure, manufacturing insight, design validation, and cultural context, positioning education as an ecosystem rather than a syllabus.

At the Jaipur Jewellery Show, students engaged directly with the B2B marketplace, studying contemporary Polki and Jadau collections, heritage jewellery from Bikaner, and emerging gemstone formats showcased by leading jewellery houses including Shiv Narayan, Valentine, Saanre, Mrs Marquise, Raanisaa, B.G. Jewellers, among others. The exposure allowed students to understand how design, craftsmanship, sourcing, and commercial viability intersect.

Beyond the exhibition, IIG curated industrial visits that revealed the operational backbone of the jewellery business. Factory visits to Valentine and Achal Jewels Pvt. Ltd. gave students end-to-end visibility into jewellery creation, from design development to Polki Jadau manufacturing and final quality control, while RMC Gems offered insight into international-scale gemstone cutting and polishing operations catering to global brands.

Design education also held a strong presence during the Jaipur programme. At the Jaipur Jewellery Design Festival (JJDF), IIG students presented their manufactured master’s project pieces, offering industry audiences a view into how design thinking is translated into production-ready jewellery.

The institute’s design capability also found recognition at the IJ Design Awards 2025, an evening that marked the elevation of jewellery as a serious art form through exclusive, finely manufactured creations. Among the finalists was Rabiya Malik, an international IIG online student, who secured a place among the Top 5 nominations in the GIA Emerging Designer of the Year category, once again highlighting the institute’s growing global footprint and the credibility of its learning outcomes across geographies.

The visit to the Amrapali Museum and the atelier of Sunita Shekhawat blended heritage with contemporary learning. In a discussion with Digvijay Singh Shekhawat, the industry’s recognition of IIG’s practical, ground-level training was evident, with interest expressed in future internship opportunities for IIG students.

IIG’s growing relevance lies in its ability to offer a complete learning ecosystem. With a diverse portfolio of courses that allows designers to study gemology, creatives to understand merchandising, and entrepreneurs to build retail and business capability, the institute has recently expanded into advanced business and retail boot camps covering branding, technology integration, AI, and experience-led retail strategy. These are complemented by RD Consultancy service, enabling students and alumni to seek guidance on business setup, expansion, and critical decision-making at a discounted rate.

Reflecting on the evolving nature of education, Rahul Desai, CEO & Managing Director, International Institute of Gemology, said, “Earlier, classrooms were enough. Today, education demands equal exposure to industry, process, culture, and decision-making. Immersive experiences like JJS are central to how we prepare students for real careers.”

As the year closes, IIG’s Jaipur immersion stands as a case study in how professional education must evolve, rooted in heritage, aligned with industry, and designed for the realities of modern business.

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JewelBuzz is Asia’s First Digital Jewellery Media & India’s No.1 B2B Jewellery Magazine, published by AM Media House. Since 2016, we’ve been the trusted source for jewellery news, market trends, trade insights, exhibitions, podcasts, and brand stories, connecting jewellers, retailers, and industry professionals worldwide.

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