The Complete Natural Diamond Buying Guide

What Are Natural Diamonds?

Natural diamonds are crystalline forms of carbon that develop beneath the Earth's surface through geological processes over an extremely long period—typically between one and three billion years. These gemstones form under conditions of intense heat and pressure deep within the Earth's mantle, approximately 140 to 190 kilometres below the surface.

Each natural diamond possesses individual characteristics shaped by its unique formation journey. These characteristics, including internal features and surface qualities, contribute to the diamond's distinct identity and are assessed during professional grading.

Natural diamonds have been valued throughout history for their rarity, durability and optical properties. They remain the hardest naturally occurring substance, rating 10 on the Mohs scale of mineral hardness.

Natural Diamonds vs Lab-Grown Diamonds

Both natural and lab-grown diamonds are real diamonds, sharing the same chemical composition, crystal structure and physical properties. The primary difference lies in their origin and formation process.

Natural diamonds form through geological processes over billions of years beneath the Earth's surface. Lab-grown diamonds are created in controlled laboratory environments using advanced technological methods that replicate natural formation conditions, typically over a period of weeks to months.

Natural diamonds may appeal to customers who value natural origin, geological rarity and traditional significance. Lab-grown diamonds may provide a larger carat weight or higher specification for the same initial budget, as production methods differ from natural extraction.

Both options are suitable for fine jewellery. The choice depends on individual preferences regarding origin, budget allocation and personal values. Neither option is universally superior—each offers distinct characteristics that may align with different priorities.

Understanding the Diamond 4Cs

The 4Cs—cut, colour, clarity and carat weight—provide a standardised framework for assessing diamond quality and characteristics. These criteria were established by the Gemological Institute of America (GIA) and are recognised internationally.

Cut

Cut refers to how effectively a diamond has been shaped and faceted to interact with light. This is distinct from diamond shape (such as round or oval) and instead describes the quality of proportions, symmetry and polish.

A well-cut diamond reflects light internally from facet to facet and disperses it through the crown, creating brilliance, fire and scintillation. Cut quality significantly influences a diamond's visual appeal and is often considered the most important of the 4Cs.

Cut grades, where applicable, typically range from Excellent to Poor. Not all diamond shapes receive formal cut grades from grading laboratories.

Colour

Colour grading for white diamonds describes the amount of visible colour present in the stone. The GIA colour scale ranges from D (colourless) to Z (light yellow or brown).

Grades D, E and F are considered colourless. Grades G, H, I and J are near-colourless and often represent excellent value, as colour differences in this range can be difficult to detect with the untrained eye, particularly once the diamond is set in jewellery.

Colour perception can be influenced by the metal in which the diamond is set. For example, a near-colourless diamond may appear whiter when set in white gold or platinum compared to yellow gold.

Clarity

Clarity considers the presence, size, position and visibility of internal characteristics (inclusions) and surface characteristics (blemishes) within a diamond. These features form naturally during the diamond's geological development.

The GIA clarity scale ranges from Flawless (FL) to Included (I3). Many diamonds in the VS (Very Slightly Included) and SI (Slightly Included) ranges offer excellent visual appeal, as inclusions in these grades are often not visible to the naked eye.

Clarity requirements may vary depending on diamond shape, size and personal preference. Larger diamonds and certain shapes may show inclusions more readily than others.

Carat Weight

Carat is a unit of weight, not size. One carat equals 200 milligrams. While carat weight influences a diamond's visual presence, the actual dimensions and appearance are also affected by cut quality and proportions.

Two diamonds of identical carat weight may appear different in size depending on how they are cut. A well-proportioned diamond will typically appear larger and more brilliant than a poorly cut diamond of the same weight.

Carat weight is one factor among the 4Cs. Balancing carat weight with cut, colour and clarity allows for informed decisions based on budget and visual priorities.

Diamond Cut vs Diamond Shape

Diamond cut and diamond shape are distinct concepts that are sometimes confused.

Diamond shape refers to the outline or geometric form of the diamond when viewed from above—such as round, oval, pear, emerald, princess, cushion, radiant, marquise or Asscher.

Diamond cut refers to the quality of the diamond's proportions, symmetry and polish, which determine how effectively the diamond interacts with light. Cut quality is assessed independently of shape.

Each diamond shape has unique optical characteristics and may suit different aesthetic preferences and ring styles. The round brilliant cut is the most popular shape and is specifically engineered to maximise light return. Fancy shapes (all shapes other than round) offer distinctive appearances and may provide a larger visual presence per carat.

Popular Diamond Shapes

LG Aurelia offers a selection of natural diamond jewellery in various shapes, where applicable. Each shape has distinct visual characteristics:

• Round: The classic brilliant cut, engineered for maximum light performance and sparkle.
• Oval: An elongated brilliant cut that can create the illusion of greater size and length on the finger.
• Pear: A teardrop shape combining round and marquise characteristics, offering elegance and versatility.
• Emerald: A rectangular step-cut shape with long facets that emphasise clarity and create a sophisticated, understated appearance.
• Princess: A square or rectangular brilliant cut known for sharp corners and strong brilliance.
• Cushion: A square or rectangular shape with rounded corners and larger facets, offering a vintage-inspired aesthetic.
• Radiant: A rectangular or square brilliant cut with trimmed corners, combining the elegance of emerald cuts with the brilliance of round cuts.
• Marquise: An elongated shape with pointed ends, designed to maximise carat weight and create a dramatic visual effect.
• Asscher: A square step-cut with cropped corners, similar to emerald cut but with a square outline and distinctive geometric appeal.

Shape availability varies by product. Please refer to individual product specifications for available options.

Balancing Size, Quality, Appearance and Budget

Selecting a natural diamond involves balancing the 4Cs according to personal priorities and budget. There is no single correct approach—preferences vary based on individual values and visual priorities.

Some customers prioritise carat weight for visual presence. Others prioritise cut quality for brilliance and light performance. Colour and clarity preferences depend on sensitivity to these characteristics and the setting in which the diamond will be placed.

Consider the following when balancing the 4Cs:

• Cut quality has the greatest impact on a diamond's visual appeal and light performance.
• Colour differences in the near-colourless range (G–J) are often subtle, particularly in smaller diamonds or when set in certain metals.
• Clarity grades in the VS and SI ranges often provide excellent visual appeal, as inclusions may not be visible without magnification.
• Carat weight influences size, but cut quality and shape also affect visual presence.

Where applicable, review product specifications and images to understand the characteristics of each diamond. If you require guidance, contact support@lgaurelia.co.uk for assistance.

Centre-Stone Carat Weight vs Total Carat Weight

When reviewing diamond jewellery specifications, it is important to distinguish between centre-stone carat weight and total carat weight.

Centre-stone carat weight refers to the weight of the primary diamond in a piece of jewellery, such as the solitaire diamond in an engagement ring.

Total carat weight (TCW) refers to the combined weight of all diamonds in a piece of jewellery, including the centre stone and any accent or pavé diamonds.

For example, an engagement ring may feature a 1.00-carat centre diamond and 0.25 carats of accent diamonds, resulting in a total carat weight of 1.25 carats. Product descriptions will specify which measurement is provided. Where applicable, both values may be listed.

Independent Diamond Grading Reports

Selected natural diamonds offered by LG Aurelia may include an independent grading report, where stated in the product information. These reports are issued by recognised gemological laboratories and provide an objective assessment of the diamond's characteristics based on the 4Cs.

A grading report describes the assessed characteristics of the diamond, including carat weight, colour grade, clarity grade, cut grade (where applicable), measurements and other identifying features. It is not a financial valuation or appraisal.

Grading reports are prepared by independent laboratories and are based on the laboratory's assessment at the time of grading. Common grading laboratories include the Gemological Institute of America (GIA), the International Gemological Institute (IGI) and others.

Not all diamonds include grading reports. Please check individual product specifications to confirm whether a grading report is supplied. If you require clarification, contact support@lgaurelia.co.uk.

Engagement Ring Settings

The setting refers to the metal framework that holds the diamond securely in place. Popular engagement ring settings include:

• Solitaire: A single diamond held by prongs, emphasising the centre stone with minimal distraction.
• Halo: A centre diamond surrounded by a ring of smaller accent diamonds, enhancing visual size and brilliance.
• Pavé: Small diamonds set closely together along the band, creating a continuous sparkle.
• Three-stone: A centre diamond flanked by two side stones, often symbolising past, present and future.
• Bezel: A metal rim that encircles the diamond, offering a modern, secure setting.
• Channel: Diamonds set into a channel within the band, providing a smooth, contemporary appearance.

Setting availability varies by product. Please refer to individual product pages for available options.

Engagement Ring Metals

LG Aurelia offers natural diamond engagement rings in a selection of precious metals, where applicable. Metal options may include:

• 9ct Gold: An alloy containing 37.5% pure gold, offering durability and affordability. Available in yellow, white and rose gold, where applicable.
• 14ct Gold: An alloy containing 58.5% pure gold, providing a balance of purity, durability and value. Available in yellow, white and rose gold, where applicable.
• 18ct Gold: An alloy containing 75% pure gold, offering a richer colour and higher purity. Available in yellow, white and rose gold, where applicable.
• Platinum: A dense, naturally white precious metal known for durability and hypoallergenic properties. Platinum is typically 95% pure in jewellery applications.

Metal availability varies by product. Please check individual product specifications for available options. All precious metal jewellery sold by LG Aurelia is hallmarked in accordance with UK standards, where applicable.

Ring Sizing and Resizing

Accurate ring sizing is essential for comfort and security. LG Aurelia provides ring sizing guidance on applicable product pages. If you are unsure of your ring size, we recommend visiting a local jeweller for professional measurement.

Some rings can be resized after purchase, depending on the design, metal and construction. Rings with continuous pavé or channel-set diamonds, eternity bands and certain intricate designs may have limited or no resizing capability.

Resizing availability and limitations vary by product. Please check individual product specifications or contact support@lgaurelia.co.uk to confirm whether a specific ring can be resized and any associated limitations.

Made-to-Order Natural Diamond Rings

Selected natural diamond engagement and wedding rings offered by LG Aurelia are made to order. These pieces are crafted specifically for each customer following order confirmation.

Made-to-order items may require approximately 21 days of manufacturing time before dispatch. This is an estimate based on supplier or manufacturer information and may vary depending on design complexity, metal type and current production schedules.

Delivery begins after dispatch. Arrival by a particular date cannot be guaranteed. If you require a piece by a specific date, please contact support@lgaurelia.co.uk in advance to discuss feasibility.

Please check individual product specifications to confirm whether an item is made to order and review estimated production timelines.

Caring for Natural Diamond Jewellery

Natural diamonds are exceptionally durable, but proper care helps maintain their brilliance and the integrity of the setting.

• Regular cleaning: Clean diamond jewellery regularly using warm water, mild washing-up liquid and a soft brush. Rinse thoroughly and dry with a lint-free cloth.
• Professional inspection: Have prong settings and clasps inspected by a professional jeweller periodically to ensure diamonds remain secure.
• Safe storage: Store diamond jewellery separately in a soft pouch or lined jewellery box to prevent scratching other pieces.
• Avoid harsh chemicals: Remove diamond jewellery before using household cleaning products, chlorine or other harsh chemicals that may affect metal settings.
• Remove during physical activity: Remove rings and bracelets during activities that may expose jewellery to impact or abrasion.

For specific care guidance related to your jewellery, contact support@lgaurelia.co.uk.

Questions to Ask Before Purchasing

Before purchasing a natural diamond, consider asking the following questions to ensure the piece meets your expectations:

• What are the diamond's 4Cs (cut, colour, clarity, carat weight)?
• Is an independent grading report included? If so, which laboratory issued the report?
• What is the centre-stone carat weight, and what is the total carat weight (if applicable)?
• What metal options are available, and are they hallmarked?
• Is the ring available in my size, and can it be resized if needed?
• Is the item made to order? If so, what is the estimated production and delivery timeline?
• What is the returns and exchange policy?
• Are there any care or maintenance recommendations specific to this piece?

If you have questions about any natural diamond jewellery offered by LG Aurelia, contact support@lgaurelia.co.uk for assistance.