Salam aleikum dear sister!
Finding your perfect shade can be a daunting task when done online, so I want to give you all the info possible for you to make a choice.
This series of blog articles is dedicated to each shade range, and all the information about it so you can have a better idea on what to expect!
In this blog, we will be looking at the Medium Deep Range-

If you are in the Deep range your skin is melanin-rich and your skin has the shade of pure chocolate.
Ebony, Espresso, Deep Chestnut and Onyx are colors you might think of when describing your skin shade, there are different undertones as well, even though a majority of deeper shades have a warm/yellow hue (more on undertones below).
In the Medium Deep range we have the shades Walnut, Deep Chestnut and Nutmeg.
One of the best ways I've found to determine your best match is to make a comparison with any matches that you've had from other companies. Below I'm listing matches from other customers who have given me feedback, and also some matches I've tested personally:

MAKE UP FOR EVER HD SKIN 4N68 ------> WALNUT
BOBBI BROWN SKIN LONG-WEAR FLUID POWDER FOUNDATION SPF 20 ------> NEUTRAL WALNUT → WALNUT
CLINIQUE EVEN BETTER MAKEUP SPF 15 – CHESTNUT ------> WALNUT
SEPHORA BEST SKIN EVER 44Y ------> NUTMEG
GIORGIO ARMANI LUMINOUS SILK FOUNDATION 13.25 ------> NUTMEG
CLINIQUE EVEN BETTER MAKEUP SPF 15 – NUTMEG →------>NUTMEG
BOBBI BROWN INTENSIVE SERUM FOUNDATION SPF 40 – CHESTNUT ------>DEEP CHESTNUT
MAC MINERALIZE LOOSE POWDER – DARK DEEP ------>DEEP CHESTNUT
COVERGIRL TRUBLEND MATTE MADE LIQUID FOUNDATION – D80 SOFT SABLE ------> DEEP CHESTNUT
CLINIQUE EVEN BETTER MAKEUP SPF 15 – MAHOGANY ------> DEEP CHESTNUT
🔘🟠🔴Now, let's talk Undertones



If the veins are:
Blueish/purple - you have a BLUE/PINK or cool undertone.
Indistinguishable or you see both green and blue - you have a BEIGE or neutral undertone.