Import Black Tourmaline — Buy in Bulk from Supplier in Sri Lanka

Sithumina Gems offers black tourmaline rough from Sri Lanka in wholesale lots ranging from 100 kg to 1,000 kg. The material is described as industrial-grade, positioning it for applications beyond ornamental gemstone use. Sri Lankan tourmaline deposits are historically associated with pegmatite formations in the central highlands and Ratnapura district, though the supplier does not specify an exact extraction region. The source description mentions high purity levels and stability, though no analytical data or certificates are cited.

Black tourmaline (schorl) is a sodium iron aluminium mineral in the tourmaline group with the typical formula NaFe3Al6(BO3)3Si6O18(OH)4. Industrial grades typically contain 10-15% iron oxide and 5-10% alumina by weight, with trace lithium and manganese. The hardness on the Mohs scale is standard at 7 to 7.5, and specific gravity ranges from 2.9 to 3.2. Sithumina Gems does not provide assay results or grade classifications, so buyers should request XRF or ICP-MS analysis to confirm oxide composition and heavy metal content before committing to bulk orders.

Applications cited by the supplier span electronics, wellness products, and construction additives. In electronics, black tourmaline is used for its pyroelectric properties in pressure sensors and acoustic devices. Wellness applications include unpolished rough for grounding products and meditation tools. For construction, fine fractions serve as functional filler in cementitious composites. The supplier mentions L/C and T/T payment terms but does not state FOB or CIF pricing, MOQ breakpoints within the 100-1,000 kg range, or lead times. Buyers should confirm packaging specifications, whether material is washed or raw, and whether lot homogeneity is guaranteed.

Sithumina Gems is based at 69l, Weliwita Kaduwela, Colombo, Sri Lanka. The supplier holds a harbor-tier trust designation, which represents a baseline verification level rather than an audited or premium status. The response rate is listed at 0.00% with an average response time of zero hours, indicating no recorded inquiry responses on the platform. This absence of engagement data is a material factor for buyers to weigh when assessing communication reliability for order negotiation and post-sale support.

The company profile does not disclose years in operation, workforce size, annual turnover, mining licenses, or export permits. No client references, certifications, or quality management systems are mentioned. The source description references compliance with international quality standards without naming specific standards (ISO, ASTM, JIS, or otherwise). Buyers should independently verify Sithumina Gems' export registration with the Sri Lanka Gem and Jewellery Authority and request copies of any claimed certificates before transferring deposits or opening letters of credit.