About us

Brahma Diam Co., Ltd. is a Bangkok-based gemstone company offering natural fancy-colour diamonds and precision-cut lab-grown gemstones. We work with collectors, jewellery designers, jewellers and trade buyers in Thailand and internationally.

Precision cutting in Bangkok

The precision-cut lab-grown gemstones produced in our own Bangkok cutting facility are individually faceted. We focus on distinctive shapes, balanced proportions and repeat-production designs made to target sizes.

Repeat-production means that stones are made to the same design and nominal face-up dimensions; it does not mean that every stone is identical. Small differences in colour tone, weight, measurements and reflections can occur between individually faceted stones. Please review the size and tolerance stated on the product page, and contact us to confirm the current measurements before manufacturing a precision-fit setting.

Clear product information

We aim to describe each gemstone accurately, including its material, colour, shape, approximate dimensions and whether the listing represents the exact stone pictured or a representative stone from a repeat-production design. Treatment information is stated when it has been confirmed.

Natural and lab-grown materials

Natural fancy-colour diamonds and lab-grown gemstones are presented as separate materials and labelled accordingly. “Natural” describes geological origin and does not by itself mean untreated; any confirmed treatment information is stated separately on the relevant product page. Lab-grown gemstones are not described as mined or natural.

Laboratory reports

An independent laboratory report is included only when the individual product page explicitly states that one is included. If a product page does not say that a report is included, no report should be assumed.

Personal assistance

If you need help with colour selection, measurements, setting compatibility or availability, please contact us before ordering. We can confirm available information about the current stone and help you review suitable options.