2.19ct Octagon Cut Sapphire Certified Unheated 9x6.1mm Timegrapher MTG 9900A Testing System

2.19ct Octagon Cut Sapphire Certified Unheated 9x6.1mm Timegrapher MTG 9900A Testing SystemSapphire is a variety of the mineral corundum, an aluminium oxide. It is typically blue but fancy coloured sapphires also occur. The variety in colours is due to trace amounts of elements such as iron, titanium, chromium, copper and magnesium. Mohs Scale of Hardness: 9 (out of 10). Sources: Mines that have yielded the finest sapphires in colour and clarity are located in Kashmir, Myanmar and Sri Lanka. Nowadays the main sources of sapphires are:

Possible to create up to 99 stored measurement programmes

Stone gauge with 18 holes marked in both points and millimetres (1/2 50 points 1-5mm)

Sauter TN Gold 80 Ultrasonic Thickness Gauge for Gold

Package Size: 20 * 6

Easy to Use & Clear to Read - Backlight large LCD display and flashlight

Each drill compartment is marked with size

Large doming punch set

Blade for Stem Cutter

Cross Pattern (Blocking) & 6 Wide Stripe (Cutting)

which is used for aiming

first step position without LED

The center line is disconnected because of subjective or objective reasons