The Gota de Aceite effect, in Colombian Emerald. Image by Sammantha Maclachlan.
Close-up of a diamond ring casting a shadow with partial text visible.

“I have another image for you,” says Sammantha Maclachlan.

We love this …

“Today was a special day… Gemmologists know that there are some gemstones or effects that we will see just a handful of times in our careers,” as Maclachlan was keenly aware. So what did she see? A Colombian emerald with an unusual growth pattern.

“Today, a ring came to me for valuation, and instantly I knew I had to get it under the microscope. That velvety look to this Colombian emerald told me I was going to see something special.” And she was right.


Sammantha Maclachlan is an accomplished gemmologist and photomicrographer. Her attention to gemmological detail and beauty is evident within the incredible shots shown here and in the Roskin Gem News Report online magazine. We thank Sammantha for sharing her images, and welcome you to enjoy the page!

Roskin Gem News Report