How to find the right Loose Gemstones AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Loose Gemstones
- Independent grading report
- For diamonds, buy only stones that come with a report from a recognized lab such as GIA, IGI or AGS, and check the report number against the lab's own verification. Seller-issued certificates are not independent and routinely overstate grades.
- Natural vs lab-grown vs simulant
- The listing must state exactly which of the three the stone is. Moissanite and cubic zirconia are simulants, not diamonds. These materials differ hugely in value, and listings often blur them with words like 'lab diamond simulant'.
- Treatment disclosure
- Colored stones should state any heating, filling, diffusion or oiling. Most colored gems are treated, and some treatments affect durability and the care the stone needs.
- Size by millimeters, not just carats
- Match the stone's shape and mm dimensions to the setting's specified seat size. Different materials have different densities, so the same carat weight can produce a different size stone that will not fit the setting.
- Hardness for wear
- For everyday rings, prefer stones with a Mohs hardness of about 7.5 or higher. Softer stones scratch and chip quickly on hands.
Brands that matter
- Charles & Colvard: Long-established moissanite producer. See Charles & Colvard on Amazon
What to avoid
- Listings calling a stone 'genuine' or 'natural' without a lab report.
- 'Certified' stones whose certificate comes from the seller itself.
- Ambiguous terms like 'diamond simulant' used next to the word diamond.
- Opals or pearls chosen for daily-wear rings.
Questions
Is moissanite a lab-grown diamond?
No. Moissanite is silicon carbide, a different mineral. A lab-grown diamond is chemically real diamond made in a lab.