Expertly Curated By Hand

Curated by Klara Allen, is a signature range of lab grown gemstones that are hand-selected for their unmatched colour, clarity and superior cut. Our gemstones are grown in controlled environments using advanced technology and strict quality control. This results in high-quality, responsible, lab grown gemstones free from the ethical concerns of mining.

Our Curation Process

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    SOURCING

    We work with the most advanced gemstone-growing labs worldwide to ensure we offer the highest quality available.

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    GRADING

    We inspect every stone to ensure it meets our grading criteria. Not every stone makes the cut.

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    ASSURANCE

    We stand behind our curation process by offering a Lifetime Manufacturing Warranty on all Klara Allen Curated gemstones.

Our Gemstones

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The Klara Allen Gem Vault


Our lab-grown diamonds are crafted with precision and responsibility, identical in beauty and brilliance to mined diamonds—without the impact of mining

Lab Grown Diamonds

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Klara Allen Curated lab-grown diamonds are composed of pure carbon, identical in chemical composition, crystal structure, and physical properties to mined diamonds. With a perfect hardness of 10 on the Mohs scale and exceptional brilliance, they embody timeless beauty created responsibly

Growing Process

Klara Allen lab-grown diamonds are created using advanced High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD) methods. These processes replicate the natural conditions under which diamonds form deep within the earth.

  • In the HPHT method, a diamond seed is exposed to intense heat and pressure, encouraging carbon atoms to crystallize around it, forming a rough diamond.
  • In the CVD method, a diamond seed is placed in a sealed chamber filled with carbon-rich gas. Under carefully controlled conditions, layers of carbon atoms bond to the seed, creating a diamond crystal.

Both methods result in diamonds that are chemically, physically, and optically identical to mined diamonds-without the environmental or social consequences of mining.

Lab Grown Diamond Properties

CHEMICAL COMPOSITION Pure Carbon (C)
HARDNESS 10 on the Mohs scale
REFRACTIVE INDEX 2.42
SPECIFIC GRAVITY 3.52
CLARITY Eye clean to flawless ( graded like mined )
ORIGIN Lab Grown
AVAILABLE COLOURS Colorless, Near-Colorless, Fancy Colors
Sapphire Stone

Lab Grown Moissanite

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Klara Allen Curated Lab-grown mosssanite is composed of silicon carbide and is prized for their remarkable hardness (9.25 on the Mohs scale) and exceptional fire and brilliance.

Growing Process

Klara Allen moissanite is created using the Physical Vapour Transport (PVT) process. This highly specialized method begins with a silicon carbide seed crystal placed inside a graphite crucible.

  • Under extreme heat in a controlled environment, silicon carbide vaporizes and gradually settles onto the seed crystal.
  • Over time, layers form and bond together, resulting in a stunning moissanite crystal of exceptional brilliance and durability.

This process ensures every Klara Allen moissanite gem is crafted to the highest standard, with unmatched fire and beauty.

SAPPHIRE PROPERTIES

CHEMICAL COMPOSITION Al2O3 (Aluminium Oxide)
HARDNESS 9 on the Mohs scale
REFRACTIVE INDEX 1.76 – 1.77
SPECIFIC GRAVITY 3.95 – 4.03
CLARITY Eye clean
ORIGIN Lab Grown
AVAILABLE COLOURS Blue, pink, purple and red.
Sapphire Stone

Lifetime Manufacturing Warranty

At Klara Allen, every piece of jewellery is crafted to last a lifetime. We proudly offer a Lifetime Manufacturing Warranty on all our jewellery and gemstones.

Coverage

  • Manufacturing defects such as loose prongs, stone misalignment, or structural issues.
  • Discoloration or instability in gold/metal due to craftsmanship faults.
  • Brilliance and fire retention in lab-grown diamonds and moissanite (under normal conditions).

Exclusions

  • Normal wear and tear (scratches, dents, bent bands).
  • Accidental damage, misuse, or loss.
  • Alterations or repairs performed by another jeweller (warranty void).

Additional Notes

  • Customers are responsible for shipping costs for inspections and repairs.
  • For accidental or non-warranty issues, we provide repair services at minimal cost—because we believe your jewellery should shine for a lifetime.

Your Klara Allen piece is not just fine jewellery-it’s a promise of craftsmanship, responsibility, and beauty that endures forever.