---
product_id: 295907438
title: "Gold Testing Stone/Kasauti Stone/Natural Obsidian (2.5 inch x 4 inch x 10 mm Thickness) - Made in Bharat"
brand: "thermo"
price: "€ 15.94"
currency: EUR
in_stock: true
reviews_count: 8
category: "Thermo"
url: https://www.desertcart.hr/products/295907438-gold-testing-stone-kasauti-stone-natural-obsidian-2-5-inch
store_origin: HR
region: Croatia
---

# Natural jet black obsidian stone Compact 2.5" x 4" x 10mm size Acid-resistant durable surface Gold Testing Stone/Kasauti Stone/Natural Obsidian (2.5 inch x 4 inch x 10 mm Thickness) - Made in Bharat

**Brand:** thermo
**Price:** € 15.94
**Availability:** ✅ In Stock

## Summary

> ⚡ Test Gold Like a Pro — Don’t Get Left Behind!

## Quick Answers

- **What is this?** Gold Testing Stone/Kasauti Stone/Natural Obsidian (2.5 inch x 4 inch x 10 mm Thickness) - Made in Bharat by thermo
- **How much does it cost?** € 15.94 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/295907438-gold-testing-stone-kasauti-stone-natural-obsidian-2-5-inch)

## Best For

- thermo enthusiasts

## Why This Product

- Trusted thermo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Engineered to resist corrosive gold testing acids, maintaining integrity through countless tests.
- • **Trusted Since 1958:** THERMO’s legacy guarantees quality and reliability in every Kasauti stone.
- • **Versatile & Essential:** Ideal for jewelers, pawnshops, workshops, and trade shows—boost your credibility with fast, clear results.
- • **Precision Testing Surface:** Smooth, non-reactive obsidian ensures accurate gold purity verification every time.
- • **Optimal Size for Professionals:** Compact 2.5" x 4" stone fits perfectly in your hand and workspace for effortless handling.

## Overview

The THERMO Gold Testing Stone is a premium natural obsidian Kasauti stone measuring 2.5" x 4" x 10mm, designed for precise and reliable gold purity testing. Its smooth, acid-resistant surface withstands corrosive testing acids, ensuring durability and consistent performance. Compact and easy to handle, it’s the trusted choice for jewelers, pawnshops, and professionals since 1958, delivering fast, clear visual confirmation of gold quality.

## Description

Premium Material: Crafted from genuine natural obsidian, this Kasauti stone features a jet black surface, providing a high contrast background for accurate gold testing. Smooth Surface: Designed with a smooth, non-reactive surface, it ensures precise and reliable testing of gold samples. Convenient Size: Measuring 60mm x 40mm x 10mm, this stone is compact and easy to handle, making it perfect for on-the-go testing and convenient storage. Versatile Use: Ideal for use in jewelry stores, workshops, pawnshops, trade shows, and personal collections, this testing stone is an essential tool for jewelers and goldsmiths. Durable and Reliable: Resistant to the corrosive effects of testing acids, this durable stone remains intact and unaffected during the testing process. Ensure the quality and purity of your gold with this high-quality, natural obsidian Kasauti stone, designed for professional and personal use.

Review: Best item for Gold testing - Black touch stone make me very satisfaction and testing quality of Gold. Thank you for this Product
Review: 👍🏻 - Good 👍🏻 Uses it for finer polishing work of sharps and edges of steel cast and iron at times brass and softer alloys, refines edges, reduces jagged edges, rolled edge correction of finer blade works rapid and frequently during precision works.

## Features

- Measuring 2.5 Inch x 4 Inch x 10mm Thickness, Gold Testing Stone offers an Ample Testing area for Examining Gold Samples. Its Dimensions Ensure Ease of Handling and Convenient Storage.
- Gold Testing Stone/Kasauti Stone is a Vital Instrument in Jewelry Making. It allows Jewelers to Accurately Verify the Purity to Gold Used In their Creations, Ensuring the Quality and Integrity to their Finished Pieces.
- Acid Resistance: Designed to Withstand the Corrosive Effects to Gold Testing Acids or Solutions, this Stone Remains Durable and Intact Throughout the Testing Process, without Reacting or Dissolving Upon Contact with Acids.
- Premium Materials: Crafted From Kasauti Stone or Natural Obsidian, the Gold Testing Stone/Kasauti Stone Features a Smooth and Non-Reactive Surface, Ideal for Performing Precise and Reliable Gold Purity Tests. These Materials are Selected for their Suitability In Gold Testing Due to their Specific Advantageous Properties.
- Ideal for Use in Jewelry Stores, Workshops, Pawnshops, Trade Shows and Personal Collections, The Gold Testing Stone Offers Fast and Clear Visual Confirmation of Metal Purity, Enhancing Workflow Efficiency.
- THERMO - Pioneering since 1958

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07MVZ9KJZ |
| Best Sellers Rank | #16,644 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #27 in Massage Stones |
| Brand | THERMO |
| Brand Name | THERMO |
| Colour | Jet Black with High Contrast |
| Country of Origin | India |
| Customer Reviews | 4.0 out of 5 stars 224 Reviews |
| Item Dimensions | 6.4 x 10.2 x 1 Centimeters |
| Item Type Name | Gold Testing Stone | Kasauti Stone |
| Item Weight | 300 Grams |
| Item dimensions L x W x H | 6.4 x 10.2 x 1 Centimeters |
| Manufacturer | THERMO, Thermo Forg Co. 10/6 Bhaktinagar Station Plot, Rajkot (Gujarat)-360002 (97730-32245) (whatsapp),WEB-www.THERMOINDIA.com // MAIL-info@thermoindia.com |
| Manufacturer Contact Information | Thermo Forg Co. 10/6 Bhaktinagar Station Plot, Rajkot (Gujarat)-360002 (97730-32245) (whatsapp),WEB-www.THERMOINDIA.com // MAIL-info@thermoindia.com |
| Model Number | HVD-8812 |
| Packer Contact Information | Thermo Forg Co. 10/6 Bhaktinagar Station Plot, Rajkot (Gujarat)-360002 (97730-32245) (whatsapp),WEB-www.THERMOINDIA.com // MAIL-info@thermoindia.com |
| Part Number | HVD-8812QQ |
| Power Source | Corded Electric |
| Power Source Type | Corded Electric |
| Style | 2.5" X 4" (inches) |
| Style Name | 2.5" X 4" (inches) |
| Unit Count | 1 Piece |

## Product Details

- **Brand:** THERMO
- **Power Source:** Corded Electric
- **Style:** 2.5" X 4" (inches)
- **Colour:** Jet Black with High Contrast
- **Item Weight:** 300 Grams

## Images

![Gold Testing Stone/Kasauti Stone/Natural Obsidian (2.5 inch x 4 inch x 10 mm Thickness) - Made in Bharat - Image 1](https://m.media-amazon.com/images/I/61RGzhnNvDL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best item for Gold testing
*by S***G on 15 December 2023*

Black touch stone make me very satisfaction and testing quality of Gold. Thank you for this Product

### ⭐⭐⭐⭐ 👍🏻
*by S***K on 20 May 2025*

Good 👍🏻 Uses it for finer polishing work of sharps and edges of steel cast and iron at times brass and softer alloys, refines edges, reduces jagged edges, rolled edge correction of finer blade works rapid and frequently during precision works.

### ⭐⭐⭐⭐⭐ Good one
*by V***. on 22 July 2025*

Good one

## Frequently Bought Together

- Thermo Gold Testing Stone/Kasauti Stone/Natural Obsidian (2.5 inch x 4 inch x 10 mm Thickness) - Made in Bharat
- Johnson Tools Gold Testing Stone or Natural Obsidian For Testing Gold Jewellery (Color : Black, shape : Owl)

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**Shop now:** [https://www.desertcart.hr/products/295907438-gold-testing-stone-kasauti-stone-natural-obsidian-2-5-inch](https://www.desertcart.hr/products/295907438-gold-testing-stone-kasauti-stone-natural-obsidian-2-5-inch)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-08-08*