Our technology — HPHT

Real diamonds, grown not mined

Light breaking across the facets of a diamond

Why HPHT?

At Everlong Gem, we use High Pressure High Temperature (HPHT) technology — the same natural process that forms diamonds deep within the Earth. Instead of taking millions of years underground, we recreate those conditions in a carefully controlled laboratory to grow a genuine diamond.

5–6 GPa
Pressure
1,300–1,600°C
Temperature
Several months
Growth

Chemically, physically, and optically identical to a mined diamond — indistinguishable to the eye, and to a gemologist.

A single cut diamond resting in darkness, lit from one side

Why HPHT instead of CVD?

Unlike CVD technology, HPHT allows us to grow a diamond using carbon extracted from your loved one's hair or your pet's fur.

That means your diamond isn't simply inspired by a memory — it contains carbon from the person or companion it represents.

A genuine diamond. A deeply personal connection.

In detail

From hair to crystal, step by step

  1. 01Collect

    We collect a small amount of hair or pet fur.

    A sample sealed in cloth, labelled and tracked

  2. 02Extract Carbon

    We extract and purify the carbon through an advanced process.

    Purified carbon crystals in a laboratory vessel

  3. 03High Pressure High Temperature

    The carbon is placed into our growth cell and transformed under extreme pressure and heat.

    The anvils of the HPHT press closing over a growth cell

  4. 04Diamond Growth

    Carbon crystallises and grows layer by layer into a real diamond.

    A gloved hand lifting the growth cell from the press

  5. 05Cut & Polish

    Our master artisans cut and polish each diamond to perfection.

    A finished brilliant-cut diamond held in tweezers

  6. 06Forever

    Your diamond is ready to be treasured forever.

    The finished diamond set into a ring
  1. 01

    Your memory

    We begin with a small amount of hair or fur from someone you love — yourself, a partner, a parent, or a beloved pet. This material contains carbon, the essential element needed to grow a diamond.

  2. 02

    Preparing the carbon

    The hair or fur is carefully cleaned and processed, then heated in a controlled oxygen-free atmosphere. Instead of burning, the material undergoes thermal decomposition, leaving behind a carbon-rich material.

  3. 03

    Purifying the carbon

    The carbon-rich material is further processed to remove unwanted elements and impurities. The result is purified carbon, carrying the carbon from the original hair or fur into the next stage.

  4. 04

    Preparing the diamond seed

    A small piece of diamond — called a diamond seed — is placed inside the growth cell. The seed provides the existing crystal structure for new carbon atoms to grow onto.

  5. 05

    Building the growth cell

    The purified carbon and diamond seed are placed inside a specially designed growth cell together with a metal solvent catalyst, commonly based on iron, nickel or cobalt.

  6. 06

    Extreme pressure and heat

    Multiple anvils compress the cell from several directions, creating pressures of approximately 5–6 GPa while temperatures reach around 1,300–1,600°C — the conditions in which diamond is stable deep inside the Earth.

  7. 07

    The diamond grows

    The metal catalyst becomes molten and carbon dissolves into it. A controlled temperature gradient carries that carbon toward the cooler diamond seed, where it crystallises atom by atom into diamond's sp³ structure.

  8. 08

    Cooling and recovery

    Once the diamond has reached the desired size the process is stopped, the system is carefully cooled, pressure is released, and the rough diamond is recovered.

  9. 09

    Cleaning the rough diamond

    Residual catalyst and carbonaceous material are removed through controlled chemical cleaning. The clean rough diamond is then ready for inspection.

  10. 10

    Cutting and polishing

    The rough diamond is examined to determine the best way to cut it, then shaped to your choice — round, oval, cushion, heart, pear, radiant, emerald and more — and polished until its brilliance is revealed.

  11. 11

    Your Everlong Gem

    What began as a small part of someone you love becomes a diamond you can hold, wear and keep. From hair or fur. To carbon. To crystal. To something that lasts.

A cushion-cut diamond in tweezers, its grading called out beside it
  1. Hair / pet fur
  2. Carbon extraction
  3. Carbon purification
  4. Diamond seed + carbon
  5. HPHT growth cell
  6. High pressure + high temperature
  7. Diamond growth
  8. Chemical cleaning
  9. Rough diamond
  10. Cut and polish
  11. Your Everlong Gem
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