Do coloured gemstones use the diamond 4Cs?

Carat and clarity language overlap, but colour and cut conventions differ by species. Use type-specific guides and the lab report for that stone.

How do I buy on Carat Mate?

Request the gemstone from the listing. We follow up for viewing and payment, then ship with the report when available.

Do you sell finished gemstone jewellery?

No. We sell certified loose gemstones. After delivery, a local jeweller can set the stone.

Are treatments disclosed?

When the supplier provides treatment data, we show it on the detail page. Prefer the certificate PDF when linked. See our treatments guide for context.

Guides

Buying coloured gemstones online

Coloured gems are not graded like diamonds. Colour, treatment, and the report matter as much as carat.

Start with the gem type

Ruby, sapphire, and emerald are the classic “big three.” Aquamarine, morganite, tanzanite, tourmaline, and spinel cover most other engagement and gift searches. Open the matching lander on Carat Mate, then refine by carat and price.

Coloured gemstones ruby sapphire emerald and aquamarine for online buying — Buying coloured gemstones — colour and treatment matter as much as carat.

Colour is face-up, not only a name

Suppliers use colour names that vary. Trust the photo (and video when present) more than a single word on the card. Side-by-side comparison of two listings of the same type is normal.

Gemstone treatments including heat and oil disclosure — Ask what was done to the stone — disclosed treatments are common.

Ask what was done to the stone

Heat, oil, and other treatments are common and often accepted when disclosed. Untreated fine stones cost more. Read the treatment field and the certificate PDF when linked.

Ruby versus sapphire both corundum — Same mineral family; colour is the shopping difference.

Browse, then request

Carat Mate’s gemstone catalog is separate from diamonds. Filter by type, colour, carat, clarity, treatment, and price, then request the exact stone you want.

High-intent landers cover ruby, sapphire, emerald, and other popular types, plus budget pages under $500, $1,000, and $2,000. We ship to the United States, Canada, the UAE, London, and Australia. Catalog prices are USD.

Carat Mate also lists certified coloured gemstones (ruby, sapphire, emerald, and more) under /gemstones. Request a specific stone for viewing, then pay and ship to the United States, Canada, the UAE, London, or Australia. Prices are USD.

Loose certified gemstone versus finished jewelry — Carat Mate sells loose certified stones — set locally after delivery.

Questions

Do coloured gemstones use the diamond 4Cs?: Carat and clarity language overlap, but colour and cut conventions differ by species. Use type-specific guides and the lab report for that stone.
How do I buy on Carat Mate?: Request the gemstone from the listing. We follow up for viewing and payment, then ship with the report when available.
Do you sell finished gemstone jewellery?: No. We sell certified loose gemstones. After delivery, a local jeweller can set the stone.
Are treatments disclosed?: When the supplier provides treatment data, we show it on the detail page. Prefer the certificate PDF when linked. See our treatments guide for context.