Feature(may vary by option.)

●High Quality:The natural black stone is particularly resistant to acidity, and the gold color is particularly easy to rub on the stone.
●Suitable for: Perfect for testing jewelry, coins, antique gold, silver, platinum collectibles.
●Acid changes color based on purity. Very easy to use
●Usage:This test stones is used to verify the gold content in items.
●This acid test stones is used to verify the gold content in items.

[Common]

[Superior]

Description

Description:
This acid test stones is used to verify the gold content in items.
Acid changes color based on purity, very easy to use.
Perfect for testing jewelry, coins, antique gold, silver, platinum collectibles.
The natural black stone is particularly resistant to acidity, and the gold color is particularly easy to rub on the stone.

Specification:
Product name:Test Stones
Color: Dark grey
Material:Stone
Type:Common,Superior (small)
Size: (About)Common:4.4*6.9cm/Superior (small):4*7.5cm

Package included:
1PC * Test Stones

Note:
Transition: 1cm=10mm=0.39inch
1. Due to the light and screen difference, the items color may be slightly different from the pictures.
2. Please allow 0.5-2 cm differences due to manual measurement.