Different Types of Lab Grown Diamonds: A Complete Beginner’s Guide

Lab grown diamonds have become an important part of the modern jewellery industry. With increasing demand for affordable, beautiful, and certified diamonds, more jewellery buyers, retailers, and wholesalers are exploring laboratory-grown diamonds as an alternative to mined diamonds.

However, many beginners have questions about the different types of lab grown diamonds. Are CVD and HPHT diamonds different? What are fancy color lab grown diamonds? Do diamond shapes and cuts affect their appearance? Which type is best for jewellery?

Understanding these differences can help you make better purchasing decisions, whether you are buying a diamond engagement ring, starting a jewellery business, or sourcing diamonds in bulk.

In this complete guide, we will explore the different types of lab grown diamonds, their manufacturing methods, colors, shapes, quality characteristics, and important factors to consider before purchasing.

1. What Are Lab Grown Diamonds?

Lab grown diamonds are real diamonds created in controlled laboratory environments using advanced technology. They have essentially the same chemical composition, crystal structure, and physical and optical properties as natural diamonds.

Unlike natural diamonds, which form deep inside the Earth over geological timescales, lab grown diamonds are produced using specialized equipment that recreates the conditions needed for diamond crystal growth.

Lab grown diamonds are not the same as diamond simulants such as cubic zirconia or moissanite. Simulants may look similar to diamonds, but they have different chemical and physical properties.

Lab grown diamonds are mainly divided into two categories based on their manufacturing methods:

• CVD (Chemical Vapor Deposition) diamonds.
• HPHT (High Pressure High Temperature) diamonds.

Both methods produce genuine diamonds suitable for jewellery applications.

2. Different Types of Lab Grown Diamonds Based on Manufacturing Methods

Understanding the manufacturing process is the first step in learning about different types of lab grown diamonds.

There are two primary technologies used in commercial lab grown diamond production.

A. CVD Lab Grown Diamonds (Chemical Vapor Deposition)

CVD stands for Chemical Vapor Deposition. It is a modern diamond-growing technology that produces diamonds inside a specially designed vacuum chamber.

In this process, a thin diamond seed is placed inside a chamber containing carbon-rich gases, commonly methane and hydrogen. Energy, often supplied through microwaves, activates the gases and allows carbon atoms to deposit onto the diamond seed layer by layer.

Over time, these carbon atoms form a larger diamond crystal.

Key Features of CVD Diamonds:

• Grown using carbon-containing gases.
• Produced under controlled laboratory conditions.
• Often develop a flat, plate-like crystal structure.
• Available in colorless, near-colorless, and fancy color varieties.
• May undergo additional HPHT treatment to improve or modify their color.
• Widely used in modern fine jewellery.

CVD technology is particularly important in the commercial lab grown diamond industry because it allows manufacturers to produce high-quality diamond crystals in controlled environments.

B. HPHT Lab Grown Diamonds (High Pressure High Temperature)

HPHT stands for High Pressure High Temperature. This method recreates some of the extreme pressure and temperature conditions involved in natural diamond formation.

During the process, a diamond seed and a carbon source are placed inside a specialized growth chamber. The equipment applies extremely high pressure and temperatures, generally around 1,300–1,600°C.

A metal catalyst helps dissolve the carbon source, allowing carbon atoms to crystallize onto the diamond seed and gradually form a diamond.

Key Features of HPHT Diamonds:

• Created using extremely high pressure and temperature.
• Use carbon material and a metal catalyst during growth.
• Can produce colorless and fancy color diamonds.
• Often show distinctive crystal growth patterns.
• May contain characteristic metallic inclusions.
• Used in both jewellery and industrial applications.

HPHT technology is one of the earliest commercially successful methods for producing synthetic diamonds and remains an important part of the lab grown diamond industry.

CVD vs HPHT Lab Grown Diamonds: What’s the Difference?

Although both methods create genuine diamonds, their manufacturing processes and some growth characteristics are different.

Which Is Better: CVD or HPHT?

There is no universal winner between CVD and HPHT diamonds. Both are genuine lab grown diamonds, and their quality depends on the individual stone rather than the growth method alone.

When choosing a diamond, consider its cut, color, clarity, carat weight, appearance, and grading report instead of selecting it only because it is CVD or HPHT.

3. Different Types of Lab Grown Diamonds Based on Color

Another way to categorize lab grown diamonds is by their color.

Laboratory technology allows manufacturers to produce diamonds in several color varieties. Some diamonds are colorless or nearly colorless, while others display attractive fancy colors.

A. Colorless Lab Grown Diamonds

Colorless lab grown diamonds are among the most popular choices for engagement rings, wedding jewellery, and fine jewellery collections.

They are valued for their bright, transparent appearance and ability to reflect light beautifully when well cut.

These diamonds are commonly graded using the standard diamond color scale, which ranges from D to Z.

• D, E, F: Colorless.
• G, H, I, J: Near colorless.
• K, L, M: Faint color.
• N to Z: Increasingly visible light color.

Buyers who prefer a bright, white appearance often consider diamonds in the D–F or G–J ranges.

B. Pink Lab Grown Diamonds

Pink lab grown diamonds are admired for their romantic appearance and elegant color.

They are increasingly popular in designer jewellery, engagement rings, pendants, and statement pieces.

Pink shades can range from soft pastel pink to vivid pink, depending on the diamond’s color characteristics and treatments.

They are an attractive option for jewellery buyers who want something different from traditional white diamonds.

C. Blue Lab Grown Diamonds

Blue lab grown diamonds offer a sophisticated and distinctive appearance.

Their color can range from light blue to deep blue. Boron-related impurities can produce blue coloration in diamonds, including certain HPHT-grown diamonds.

Blue diamonds are commonly used in designer rings, earrings, necklaces, and luxury jewellery collections.

D. Yellow Lab Grown Diamonds

Yellow lab grown diamonds are known for their warm and vibrant appearance.

Nitrogen impurities can contribute to yellow coloration in diamonds. Depending on the growth conditions and other characteristics, these diamonds may display different shades of yellow.

Popular shades include:

• Light Yellow

• Fancy Yellow

• Fancy Intense Yellow

• Fancy Vivid Yellow

Yellow lab grown diamonds are suitable for statement jewellery and distinctive engagement ring designs.

E. Green Lab Grown Diamonds

Green lab grown diamonds offer a unique appearance and are popular among buyers looking for unusual fancy color gemstones.

Green coloration can be produced through different growth-related processes or treatments, including irradiation in some cases.

Their color intensity and distribution can vary, making individual grading and disclosure important.

F. Other Fancy Color Lab Grown Diamonds

In addition to pink, blue, yellow, and green, lab grown diamonds can also be available in other fancy color varieties.

Some examples include:

• Orange Lab Grown Diamonds
• Purple Lab Grown Diamonds
• Brown Lab Grown Diamonds
• Champagne Lab Grown Diamonds

The availability of these colors depends on manufacturing techniques, growth conditions, and post-growth treatments.

Fancy color diamonds can add individuality and creativity to modern jewellery designs.

4. Different Types of Lab Grown Diamonds Based on Shape

Diamond shape is another important factor when selecting a lab grown diamond.

The shape determines the overall outline and visual appearance of the finished diamond. It also influences the style of jewellery in which the diamond is used.

Here are some popular lab grown diamond shapes.

1. Round Brilliant Cut
The round brilliant is one of the most popular diamond shapes. It is designed with carefully arranged facets to maximize brilliance, fire, and sparkle.
It is commonly used in engagement rings, wedding rings, earrings, and pendants.

2. Oval Cut
Oval diamonds feature an elongated shape that creates an elegant and sophisticated appearance.
They are popular for engagement rings because their proportions can create the impression of a larger-looking stone.

3. Princess Cut
Princess-cut diamonds feature a square or slightly rectangular outline with pointed corners.
Their modern appearance makes them suitable for engagement rings, wedding jewellery, and contemporary designs.

4. Emerald Cut
Emerald-cut diamonds feature a rectangular shape with step-cut facets.
Unlike brilliant cuts, they create a hall-of-mirrors effect with broad flashes of light. They are appreciated for their elegant and timeless appearance.

5. Pear Cut
Pear-shaped diamonds combine the rounded end of an oval with a pointed end.
They are often used in pendants, earrings, and distinctive engagement ring designs.

6. Cushion Cut
Cushion-cut diamonds have rounded corners and a square or rectangular outline.
Their soft appearance makes them popular for vintage-inspired and contemporary jewellery.

7. Radiant Cut
Radiant-cut diamonds combine a rectangular or square outline with brilliant-style faceting.
They offer an attractive balance of shape and sparkle.

8. Marquise Cut
Marquise diamonds have an elongated shape with pointed ends.
Their distinctive appearance can make a centre stone look larger relative to its carat weight.

9. Heart Shape
Heart-shaped diamonds are recognized for their romantic design and distinctive outline.

They are often selected for special occasions, anniversary gifts, and personalized jewellery.

5. Different Types of Lab Grown Diamonds Based on Cut, Color, Clarity, and Carat

When purchasing lab grown diamonds, understanding the 4Cs is essential.

The 4Cs are the internationally recognized diamond quality characteristics: Cut, Color, Clarity, and Carat Weight.

Cut

Cut refers to how well a diamond’s proportions, symmetry, and polish allow it to interact with light.

Common cut grades for round brilliant diamonds include:

• Excellent
• Very Good
• Good
• Fair
• Poor

A well-cut diamond generally displays better brilliance and sparkle.

Color

Color grading evaluates how much visible body color a diamond has.

For colorless diamonds, the grading scale generally runs from D to Z, with D representing the highest colorless grade.

Fancy color diamonds are assessed using a separate fancy color grading approach.

Clarity

Clarity measures the presence of internal inclusions and external blemishes.

Common clarity grades include:

• FL – Flawless
• IF – Internally Flawless
• VVS1 and VVS2 – Very Very Slightly Included
• VS1 and VS2 – Very Slightly Included
• SI1 and SI2 – Slightly Included
• I1, I2, and I3 – Included

A diamond’s clarity grade helps buyers understand its internal and external characteristics.

Carat Weight

Carat refers to the weight of a diamond, not its physical dimensions.

One carat equals 200 milligrams.

Lab grown diamonds are available in various carat weights, from small accent stones to larger centre diamonds.

Important: Two diamonds with the same carat weight may look different and have different quality grades. Always evaluate all four Cs together.

6. Different Types of Lab Grown Diamonds Based on Crystal Classification

Apart from manufacturing methods, diamonds can also be classified according to their atomic structure and the presence of trace impurities.

This classification is known as diamond type classification. It is different from CVD and HPHT manufacturing categories.

Some commonly discussed diamond types include:

• Type Ia: Contains nitrogen atoms grouped together within the diamond crystal.
• Type Ib: Contains isolated nitrogen atoms.
• Type IIa: Contains no detectable nitrogen impurities and is generally very low in other impurities.
• Type IIb: Contains boron impurities, which can contribute to blue coloration.

Many colorless to near-colorless lab grown diamonds are Type II diamonds. However, diamond type alone does not determine its overall beauty, quality, or value.

7. How to Choose the Right Type of Lab Grown Diamond?

Choosing the right lab grown diamond depends on your personal preferences, jewellery design, budget, and quality expectations.

Here are some important factors to consider before making a purchase.

1. Decide on the Diamond Color

First, determine whether you prefer a traditional colorless diamond or a fancy color diamond.

Colorless diamonds are versatile, while pink, blue, yellow, and green diamonds offer distinctive jewellery styles.

2. Select the Right Shape

Choose a diamond shape that complements your jewellery design.

Round, oval, emerald, cushion, and pear shapes are popular options for different jewellery styles.

3. Compare CVD and HPHT Diamonds

Understand the differences between the two growth methods, but avoid assuming one method always produces better-quality diamonds.

Compare the individual diamond’s grading characteristics and appearance.

4. Check the 4Cs

Always evaluate cut, color, clarity, and carat weight before purchasing.

These characteristics help you compare different diamonds and identify one that meets your expectations.

5. Verify Diamond Certification

Choose a supplier who can provide a grading report from a recognized gemological laboratory, where available.

Check the report number, diamond specifications, and laboratory-grown disclosure.

6. Purchase from a Reliable Supplier

Work with an experienced supplier who offers transparent product details, suitable certification, competitive pricing, and professional customer support.

8. How to Identify Genuine Lab Grown Diamonds?

Lab grown diamonds are real diamonds, but identifying their laboratory-grown origin requires specialized gemological testing.

They cannot reliably be distinguished from natural diamonds through ordinary visual inspection alone.

Professional gemological laboratories use advanced equipment to examine characteristics such as:

• Crystal growth patterns.
• Internal inclusions.
• Fluorescence and phosphorescence.
• Spectroscopic characteristics.
• Other growth-related features.

Laboratories such as GIA and IGI provide services to identify and assess laboratory-grown diamonds.

When purchasing, ask for the appropriate grading documentation and verify the report directly with the issuing laboratory.

9. Why Are Lab Grown Diamonds Popular in the Jewellery Industry?

Lab grown diamonds are gaining attention among jewellery manufacturers, wholesalers, retailers, and consumers.

Some important reasons behind their popularity include:

Different Design Options: They are available in various shapes, sizes, and colors, giving jewellery designers more creative possibilities.

Competitive Pricing: Lab grown diamonds generally cost less than comparable natural diamonds, although prices vary depending on market conditions and specifications.

Consistent Supply Opportunities: Laboratory production offers an additional sourcing channel for jewellery businesses.

Modern Manufacturing Technology: Advanced production methods allow manufacturers to create diamonds with different characteristics for jewellery applications.

Growing Consumer Awareness: More buyers are learning about laboratory-grown diamonds and considering them for engagement rings, wedding jewellery, and everyday accessories.

10. Where to Buy Quality Lab Grown Diamonds in India?

India is an important destination for the lab grown diamond industry, with established expertise in diamond cutting, polishing, jewellery manufacturing, and international trade.

For jewellery retailers, wholesalers, manufacturers, and individual buyers, choosing the right supplier is an important part of purchasing quality lab grown diamonds.

Before selecting a supplier, consider the following:

• Availability of CVD and HPHT diamonds.
• Different diamond shapes and sizes.
• Color and clarity options.
• IGI-certified diamond availability.
• Transparent wholesale pricing.
• Bulk order and customized sourcing options.
• Professional customer support.

If you are looking for a lab grown diamond supplier in India, Caratline Diamond is one option to explore for your diamond sourcing requirements.

Caratline Diamond, based in Surat, Gujarat, focuses on lab grown diamonds and serves as a sourcing option for buyers interested in different diamond varieties.

Whether you are a jewellery manufacturer, retailer, wholesaler, or diamond buyer, you can explore the available collections and discuss your requirements.

Visit the official website: https://caratlinediamond.in

11. Common Myths About Different Types of Lab Grown Diamonds

There are several misconceptions about lab grown diamonds. Understanding the facts can help buyers make informed decisions.

Myth 1: Lab Grown Diamonds Are Fake Diamonds
Fact: Lab grown diamonds are real diamonds with essentially the same chemical composition and crystal structure as natural diamonds. They are not simulants.

Myth 2: CVD Diamonds Are Better Than HPHT Diamonds
Fact: Neither growth method is automatically better. The quality of an individual diamond depends on its characteristics and grading.

Myth 3: All Lab Grown Diamonds Are Colorless
Fact: Lab grown diamonds are available in different colors, including pink, blue, yellow, and green.

Myth 4: Lab Grown Diamonds Cannot Be Certified
Fact: Recognized gemological laboratories provide identification and grading services for lab grown diamonds.

Myth 5: Diamond Shape and Diamond Type Mean the Same Thing
Fact: Diamond type can refer to its growth method or crystal classification, while shape describes its physical outline, such as round, oval, or emerald.

Conclusion

Understanding the different types of lab grown diamonds makes it easier to choose the right diamond for your jewellery requirements.

From CVD and HPHT manufacturing methods to colorless and fancy color varieties, lab grown diamonds offer a wide range of options for modern jewellery buyers.

Diamond shapes, cut quality, color, clarity, and carat weight also play important roles in determining the appearance and characteristics of each stone.

Whether you are purchasing a diamond for personal jewellery or sourcing products for a wholesale business, always compare specifications, verify certification, and choose a reliable supplier.

If you are exploring different varieties of lab grown diamonds in India, consider Caratline Diamond for your diamond sourcing requirements.

Discover More About Our Diamond Collections and Services

Explore Caratline Diamond’s wide range of lab grown diamond collections and services:

• Lab Grown Diamond Supplier
• CVD Lab Grown Diamond Supplier
• Lab Grown Diamond Jewellery
• Pink Lab Grown Diamond Supplier
• Blue Lab Grown Diamonds Supplier
• Green Lab Grown Diamonds Supplier
• Yellow Lab Grown Diamond Suppliers
• Red Lab Grown Diamonds Supplier

FAQs

1. What are the Main Types of Lab Grown Diamonds?
The two main types of lab grown diamonds are CVD (Chemical Vapor Deposition) and HPHT (High Pressure High Temperature). They are categorized according to their manufacturing methods.

2. What is the Difference Between CVD and HPHT Diamonds?
CVD diamonds are grown by depositing carbon atoms from carbon-containing gases onto a diamond seed. HPHT diamonds are created using high pressure, high temperature, carbon, and a metal catalyst.

3. Are CVD Diamonds Better than HPHT Diamonds?
Neither is universally better. Both produce genuine diamonds, and buyers should compare cut, color, clarity, carat weight, and the individual stone’s appearance.

4. What Colors are Available in Lab Grown Diamonds?
Lab grown diamonds are available in colorless, pink, blue, yellow, green, orange, purple, and brown varieties, depending on growth conditions and treatments.

5. Which Lab Grown Diamond Color is Most Popular?
Colorless and near-colorless diamonds are popular choices for traditional engagement rings and fine jewellery. Fancy colors are also attractive for distinctive jewellery designs.

6. Are Lab Grown Diamonds Real Diamonds?
Yes. Lab grown diamonds have essentially the same chemical composition, crystal structure, and physical properties as natural diamonds. Their origin is different.

7. Can Lab Grown Diamonds Be IGI Certified?
Yes. IGI provides grading reports for lab grown diamonds, including information about shape, measurements, color, clarity, and other characteristics.

8. Which Diamond Shape is Best for Lab Grown Diamonds?
Round brilliant is a popular choice for its sparkle. Oval, emerald, princess, pear, cushion, and radiant shapes are also popular. The best shape depends on personal preference and jewellery design.

9. Are Fancy Color Lab Grown Diamonds Available in India?
Yes. Buyers can explore different fancy color varieties, including pink, blue, yellow, and green lab grown diamonds through Indian suppliers, depending on availability.

10. Where Can I Buy Wholesale Lab Grown Diamonds in India?
You can explore Indian lab grown diamond suppliers such as Caratline Diamond. Compare product specifications, grading reports, pricing, and bulk order terms before purchasing.