ALUMINIUM CARATS SIZING DIAMOND GEM CARAT MEASURING JEWELLERS JEWELLERY SIZE MM

Aluminium jewellers' gauge that reads a diamond or gem's size straight off in carats on one side and in millimetres on the other.

⭐ At a glance

📏 Carat side: graduated holes from 1/32 to 4 carats

📏 Millimetre side: graduated holes from 2mm to 11mm

Material: Aluminium

📦 What's included: 1 x measuring gauge

✔️ Condition: New

🔧 What it does & how to use

A quick, hands-on way for jewellers, gemmologists and hobbyists to check the approximate size of a loose diamond or gemstone without scales or a loupe. The gauge has a row of graduated holes on each face — one row marked in carats, the other in millimetres — so you can read off a size in whichever unit suits the job.

• Choose a side: turn the gauge to the carat row or the mm row depending on which measurement you need.
• Test the stone: starting with a hole that looks close in size, try dropping the gem into it.
• Find the fit: work up or down the row of holes until the stone sits snugly without falling through.
• Read the size: the carat weight or millimetre diameter is marked next to that hole.