Make an Inquiry
Whether you are seeking a specific diamond or need expert guidance, our consultants are here to help you find exactly what you desire.
Diamond Inquiry
Share your preferences and our team will curate a personalised selection just for you.
Our Recommended Quality Standards for Lab-Grown Diamonds
At ULTIMATE-GEMS s. r. o., we help you make informed choices when purchasing lab-grown diamonds. Here is our expert guidance on selecting the best diamond colour, clarity, cut, and growth method — all optimised for quality and value.
Color — E Color Grade
We recommend E color lab-grown diamonds, the second-highest grade after D. E color offers exceptional whiteness and brilliance, nearly indistinguishable from D color but often at a more accessible price point.
Clarity — VVS1 or VVS2
- VVS1 (Very Very Slightly Included 1) — minute inclusions difficult for a skilled grader to detect under 10× magnification.
- VVS2 (Very Very Slightly Included 2) — minor inclusions slightly more visible than VVS1 under magnification, but still eye-clean and virtually flawless to the naked eye.
Cut — Ideal or Excellent Cut Only
Cut quality is the single most important factor in a diamond's visual appeal. A well-cut diamond maximises brilliance, fire, and sparkle.
- Ideal Cut — The absolute pinnacle. Ideal cut diamonds are engineered for maximum light performance, producing superior fire, brilliance, and scintillation.
- Excellent Cut — An outstanding grade that delivers incredible sparkle and visual beauty, with only minor differences from Ideal that are virtually undetectable to the unaided eye.
Growth Method — HPHT vs. CVD
- HPHT (High Pressure High Temperature) — Mimics the natural diamond formation process. HPHT diamonds typically exhibit excellent crystal structure and are often preferred for colourless stones (D–F range).
- CVD (Chemical Vapour Deposition) — Grows diamond crystal from a carbon-rich gas. CVD technology allows for precise control of growth conditions and is frequently used for larger carat sizes.